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SUMMARY:The beam alignment problem in THz wireless networks
DTSTART;VALUE=DATE-TIME:20240220T112000Z
DTEND;VALUE=DATE-TIME:20240220T114000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1165@cern.ch
DESCRIPTION:Speakers: Francesco Verde (Department of Electrical Engineerin
 g and Information Technology)\nTerahertz (THz)-band communications are a k
 ey enabler for ultrahigh bandwidth and ultralow latency communication para
 digms. When integrated with other THz-band applications\, such as localiza
 tion\, sensing\, and imaging\, THz technologies may lead \nto the deployme
 nt of  intelligent wireless communication systems. However\, communication
 s at THz are quite challenging due to the severe attenuation of signal pow
 er caused by high diffraction and penetration losses\, as well as  atmosph
 eric absorption. To compensate for the severe path loss\, high-directional
  beamforming with large antenna gains both at the transmitter and at the r
 eceiver is mandatory. Designing such a highly directional beamforming requ
 ires an initial beam alignment procedure prior to data transmission\, in o
 rder to maintain a desired signal-to-noise ratio (SNR) level. However\, fa
 st and accurate acquisition of beam directions is quite challenging for TH
 z-band communications due to the very low SNR available before properly al
 igning the beams with the dominant signal propagation paths. In this paper
 \, we develop a receiver-assisted beam-alignment algorithm by which the re
 ceiver and the transmitter collaborate to identify the angle-of-arrivals a
 nd angle-of-departures associated with the strongest paths of the THz chan
 nel.\n\nhttps://indico.unina.it/event/75/contributions/1165/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1165/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Metamaterial quasi-optical components for astronomical instrumenta
 tion at millimetre and sub-millimetre wavelengths
DTSTART;VALUE=DATE-TIME:20240220T084000Z
DTEND;VALUE=DATE-TIME:20240220T090000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1163@cern.ch
DESCRIPTION:Speakers: Giampaolo Pisano (Sapienza University of Rome)\nWe r
 eport on the development of novel optical components based on metamaterial
 s\, carried out in the last years\, for mm and sub-mm astronomical instrum
 entation. Using the mesh-filter technology\, we have realised transmissive
  and reflective half-wave plates\, flat lenses\, anti-reflection coatings\
 , absorbers\, etc. The metal-mesh technology\, based on copper grids embed
 ded within polypropylene layers\, gives the possibility to accurately and 
 arbitrarily manipulate the radiation across surfaces and allows in princip
 le to replace any classical optical component with a mesh-equivalent one. 
 \nThe devices mentioned above can find applications in other fields such a
 s telecommunications and security. The technology itself can be pushed fur
 ther to realise novel/exotic metamaterials with properties of interest for
  theoretical studies. In addition\, the realisation of these metamaterials
  can be extended into the Silicon technology\, with all the advantages ass
 ociated with it.\n\nhttps://indico.unina.it/event/75/contributions/1163/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1163/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optical Permittivity and Permeability in the THz Band  from Indepe
 ndent Measurements of Normal Transmission and Reflection
DTSTART;VALUE=DATE-TIME:20240219T112000Z
DTEND;VALUE=DATE-TIME:20240219T114000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1164@cern.ch
DESCRIPTION:Speakers: Gian Paolo Papari (Dipartimento di Fisica Ettore Pan
 cini\, Università di Napoli Federico II )\nAn accurate retrieval procedur
 e has been developed in order to extract both the dielectric and magnetic 
 response of thin and thick samples in the THz band. Differently from a pre
 vious approach [1]\,  the exact expressions of the complex reflection $\\t
 ilde{R}$ and transmission $\\tilde{T}$ of the THz beam normally impinging 
 on the sample surface are used. The core of the methodology consists in th
 e independent employment of the experimental $\\tilde{R}$ and $\\tilde{T}$
  values\, processed by a total variation technique [2] to retrieve the com
 plex impedance $\\tilde{z}$ and refractive index $\\tilde{n}$\,  namely $\
 \tilde{z}_R$\, $\\tilde{z}_T$\, $\\tilde{n}_R$\, $\\tilde{n}_T$. From here
  the dielectric function $\\tilde{\\varepsilon}$ and permeability $\\tilde
 {\\mu}$ are obtained through $\\tilde{\\varepsilon}_i$=$\\tilde{n}_i$ $\\t
 ilde{z}_i$ $\\tilde{\\mu}_i$=$\\tilde{n}_i$/ $\\tilde{z}_i$ to achieve $\\
 tilde{\\varepsilon}_R$\, $\\tilde{\\varepsilon}_T$\, $\\tilde{\\mu}_R$\, $
 \\tilde{\\mu}_T$. The technique is applied to a thin film of BiFeO3 showin
 g a small but finite magnetization and a phononic resonance at about 2 THz
  [3]. The BiFeO3 films have been grown on quartz\, following a procedure s
 imilar to that previously optimized for the deposition on Si (100) substra
 te [4]. In particular\, the films have been deposited in the temperature r
 ange 600–800 °C for 60 min using the Bi(phenyl)3 and Fe(tmhd)3 (phenyl 
 = –C6H5\, H-tmhd = 2\,2\,6\,6-tetramethyl-3\,5-heptandione)\, as precurs
 ors. The X-ray diffraction patterns\, recorded in grazing incidence mode (
 0.8°)\, have confirmed the formation of pure\, polycrystalline BiFeO3 fil
 ms\, while the field emission scanning electron microscopy image indicates
  the presence of grains of about 500-600 nm. \n\nReferences\n1. 	H. Němec
 \, F. Kadlec\, P. Kužel\, L. Duvillaret\, and J. L. Coutaz\, "Independent
  determination of the complex refractive index and wave impedance by time-
 domain terahertz spectroscopy\," Opt. Commun. 260(1)\, 175–183 (2006).\n
 2. 	L. Duvillaret\, F. Garet\, and J. L. Coutaz\, "A reliable method for e
 xtraction of material parameters in terahertz time-domain spectroscopy\," 
 IEEE J. Sel. Top. Quantum Electron. 2(3)\, 739–745 (1996).\n3. 	G. A. Ko
 mandin\, V. I. Torgashev\, A. A. Volkov\, O. E. Porodinkov\, A. A. Pronin\
 , L. D. Iskhakova\, and A. A. Bush\, "Effect of BiFeO 3 ceramics morpholog
 y on electrodynamic properties in the terahertz frequency range\," Phys. S
 olid State 54(6)\, 1191–1198 (2012). \n4. 	Q. Micard\, G. G. Condorelli 
 and G. Malandrino\, "Piezoelectric BiFeO3 Thin Films: Optimization of\nMOC
 VD Process on Si"\, Nanomaterials 10\, 630/1-630/10 (2020).\n\nhttps://ind
 ico.unina.it/event/75/contributions/1164/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1164/
END:VEVENT
BEGIN:VEVENT
SUMMARY:THz dynamics of  aqueous binary mixtures at a mesoscopic level
DTSTART;VALUE=DATE-TIME:20240220T094000Z
DTEND;VALUE=DATE-TIME:20240220T100000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1161@cern.ch
DESCRIPTION:Speakers: Zahra Mazaheri (University of Naples\, Federico II)\
 nWe report a study at a mesoscopic level on the THz dynamics of three alip
 hatic alcohols (2-propanol\, methanol\, and ethanol)\, one diol (ethylene 
 glycol)\, and the corresponding water solutions at room temperature\, usin
 g a time domain ellipsometer. The dielectric response of the pure liquids 
 is nicely fitted using a generalized Debye-Lorentz model\, which considers
  hydrogen-bond rupture and reformation dynamics\, the motion of the alkyl 
 chains and of the H-bonded OH groups\, and the presence of molecular vibra
 tions [1]. For the binary mixtures\, we focus on the properties of the wat
 er-rich region\, finding an anomalous behavior in the absorption propertie
 s at very low solute molar concentrations (XM). These results\, first obse
 rved in the THz region\, are in line with previous findings (mostly from t
 hermodynamic measurements) and can be explained by considering the amphiph
 ilic nature of the alcohol molecules. Figure 1 (i) presents the frequency 
 dependent dielectric properties of (a) 2-propanol\, (b) methanol\, (c) eth
 anol\, and (d) ethane-1\,2-diol in the THz region achieved by a customized
  THz time-domain spectroscopic ellipsometer [2] and the corresponding fitt
 ing curves based on an effective Debye model [3]\, showing an excellent ag
 reement. \nHowever\, this model fails to reproduce the experimental result
 s when an alcohol-water binary mixture is considered\, especially for smal
 l (0-5 %) alcohol molar fraction XM. To better highlight the molecular dyn
 amics of the solute at very low XM\, we display in Fig.1 (ii) the deviatio
 n of the experimental results from the expected Debye behavior (Δk = kexp
  − kDebye).\nResults show that the mixtures behave completely out of the
  Debye prediction\, which can be explained by the complex dynamics occurri
 ng in aqueous binary mixtures due to the competing\, hydrophobic and hydro
 philic\, behavior of the alcohol. In the water-rich region (very scarce so
 lute molecules)\, we measure a sudden drop in absorption properties of wat
 er\, the dominant mechanism appearing to be the destruction of existing H-
 bonds between water molecules\, since the hydrophobic behavior of the alco
 hol plays the main role. As the solute molar concentrations becomes higher
 \, we first observe an increase in the absorption properties of the mixtur
 e\, due to the formation of water clusters around alcohol molecules\, foll
 owed by a Debye-like decay by increasing the alcohol concentration.\n\nhtt
 ps://indico.unina.it/event/75/contributions/1161/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1161/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terahertz imaging for the detection of cimiciato-infected hazelnut
 s
DTSTART;VALUE=DATE-TIME:20240219T162000Z
DTEND;VALUE=DATE-TIME:20240219T164000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1162@cern.ch
DESCRIPTION:Speakers: Fulvia Gennari (University of Pisa\, Department of P
 hysics)\nIn recent years\, hazelnut cultivation is becoming increasingly i
 mportant in terms of areas invested and crops\nexpected. Among the various
  quality defects\, one of the most detrimental alterations to hazelnut qua
 lity is “cimiciato”\ndefect\, which is caused by a group of insects be
 longing to the families of Coreidae and Pentatomidae. Nowadays no\nreliabl
 e automatic method to discriminate between healthy and cimiciato hazelnuts
  exists and the food industry still\nrelies on manual visual inspection of
  shelled nuts.\n\nThe aim of this work was to validate a continuous-wave t
 erahertz transmission imaging system to\ndiscriminate cimiciato-infected h
 azelnuts by a non-invasive method that can\, potentially\, be implemented 
 in a realtime approach. Carrying low-energy photons\, THz radiation is una
 ble to induce ionization processes\, which means\nthat it is a perfectly s
 afe radiation for biological tissues.\n\nThe trial was conducted on a samp
 le of 150 hazelnuts. We set up a classification model and to assess its\np
 erformance we used a validation sample of 50 hazelnuts. We plotted the dis
 tributions of the healthy and injured\nsamples and fitted the two curves w
 ith a polynomial function. The data from each unknown nut was added as a n
 ew\ndata point to each of the two distributions\, and the minimum distance
  between this new point and the fitting function\nwas calculated. The new 
 data point was\, then\, assigned to the distribution with the lowe r dista
 nce and the\ncorrect/incorrect attribution was evaluated by visual inspect
 ion of the nuts. The procedure was able to correctly\nidentify 100% of cim
 iciato hazelnuts in the mixed population with still a 25% false negative r
 ate.\n\nThe developed method is simple\, requires a low-cost apparatus and
  can potentially be implemented in real time\,\ntherefore\, it can be of g
 reat interest for the food industry\n\nhttps://indico.unina.it/event/75/co
 ntributions/1162/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1162/
END:VEVENT
BEGIN:VEVENT
SUMMARY:THz amplitude modulation by organic-based metadevices
DTSTART;VALUE=DATE-TIME:20240219T092000Z
DTEND;VALUE=DATE-TIME:20240219T094000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1152@cern.ch
DESCRIPTION:Speakers: Federico Grandi (Dipartimento di fisica\, Politecnic
 o di Milano and CNR IFN – Istituto di Fotonica e Nanotecnologie\, Milano
 \, Italy)\nTHz radiation\, in the region between 0.1 and 10 THz\, has attr
 acted a lot of interest in the last years due to its peculiar interaction 
 properties with matter and the possibility of applying it both in telecomm
 unications and sensing devices [1]. One of the current subjects of active 
 investigation in this field is the enhancement and optimization of the int
 eraction between THz radiation and materials for application in these fiel
 ds.\n\nIn this framework\, metasurfaces have been proposed for this purpos
 e [2]. Metasurfaces are materials engineered in such a way as to express p
 eculiar electromagnetic properties in a specific range of frequencies of t
 he electromagnetic spectrum. In particular\, it is possible to design meta
 materials that can strongly interact with THz pulses to tune their frequen
 cy\, amplitude\, and phase.\n\nWe studied an innovative metadevice configu
 ration that mixes the flexible properties of Split-Ring resonator-based me
 tasurfaces with the dynamic tuning capabilities of organic semiconductors 
 to achieve an electrically tunable metadevice [3]. This peculiar approach 
 has been already demonstrated for microwaves [4] but there is yet no direc
 t application in the THz spectral region. In particular\, thanks to this d
 evice\, we were able to obtain modulation depth of the THz amplitude in th
 e order of 65% at a frequency of around 0.7 THz\, as shown in Figure 1.\n\
 nThese performances are comparable to other state-of-the-art devices [5] b
 ut with the increased benefit of requiring a very low driving electric fie
 ld\, in the order of 1V. This capability comes from the use of so-called O
 rganic Mixed Ion-Electron Conductors (OMIECs)\, a class of semiconductors 
 whose permeability to charge carriers can be tuned by applying an external
  electric field\, effectively changing the semiconductor conductivity.\n\n
 Furthermore\, we tested the effectiveness of applying different manufactur
 ing methods to produce these metadevices\, shifting towards a more scalabl
 e and cheaper approach exploiting ink-jet printing for both the metasurfac
 e and the organic semiconductor.\n\nThis work opens the way to the exploit
 ation of OMIECs-based modulating devices for applications in telecommunica
 tions and sensing. Moreover\, other fields like electronics or bioelectron
 ics could benefit from the further development of the capabilities and pro
 perties of organic semiconductors.\n\nhttps://indico.unina.it/event/75/con
 tributions/1152/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1152/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Material Characterizations in the Sub-THz Region for Particle Acce
 lerators
DTSTART;VALUE=DATE-TIME:20240220T152000Z
DTEND;VALUE=DATE-TIME:20240220T154000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1140@cern.ch
DESCRIPTION:Speakers: Andrea Passarelli (INFN - Sezione di Napoli)\nCoatin
 gs play a crucial role for the functionality of vacuum chambers in particl
 e accelerators\, serving dual purposes by efficiently facilitating pumping
  and mitigating electron cloud effects. However\, their impact on the surf
 ace resistance of chamber walls raises concerns\, potentially influencing 
 machine performances and imposing limitations on achievable energies and c
 urrents. Therefore\, an electromagnetic characterization is essential for 
 a comprehensive study of accelerator structures\, particularly in the cont
 ext of the next generation of particle accelerators where the demand for e
 xtremely short bunches accentuates the importance of assessing material re
 sponses in the sub-THz region.\n\nIn this presentation\, we focus on the e
 lectromagnetic characterization of three different types of Non-Evaporable
  Getters (NEG) coatings. Specifically\, we examine the CERN standard\, a d
 ensified film using HiPIMS\, and porous\, high-pressure coated. NEG coatin
 gs are particularly utilized to achieve conditions of ultra-high vacuum. A
 dditionally\, we explore the characterization of Amorphous Carbon (a-C)\, 
 necessitating a modification of the setup. a-C is primarily employed for m
 itigating the electron cloud effect.\n\nThrough this presentation\, we wil
 l showcase the electromagnetic characterization of these coating materials
  using a time-domain method based on THz waveguide spectroscopy. This adva
 nced methodology allows for a comprehensive exploration of the electromagn
 etic properties of coatings\, providing valuable insights into their behav
 ior within the sub-THz frequency range. The findings contribute to a deepe
 r understanding of the intricate interactions between coatings and acceler
 ator structures\, with the aim of optimizing performance and efficiency in
  the evolving landscape of particle acceleration technologies.\n\nhttps://
 indico.unina.it/event/75/contributions/1140/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1140/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The LNF IR-THz beamline @ DAϕNE: experimental set-ups and perspec
 tives
DTSTART;VALUE=DATE-TIME:20240220T150000Z
DTEND;VALUE=DATE-TIME:20240220T152000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1146@cern.ch
DESCRIPTION:Speakers: Lucilla Pronti (INFN-LNF)\nThe INFN-LNF DAϕNE stora
 ge ring produces a powerful source of Synchrotron Radiation in the THz ran
 ge [1]. The brilliance of SR in the THz domain is up to three orders of ma
 gnitude with respect to conventional sources (i.e. mercury lamps)\, as sho
 wn in Figure 1\, and the flux increases with the electron current stored. 
 These aspects permit to perform experiments in several field from material
  science to biology and chemistry and offer the possibility to analyze sam
 ples in solid\, liquid and gas phases [2-8]. Experimental set-ups availabl
 e at SINBAD beamline and applications are presented. Moreover\, prospectiv
 es of the Terahertz (THz) technology applied on cultural heritage field wi
 ll be described [9\,10].\n\nReferences\n\n1.	Cestelli Guidi\, M.\; Piccini
 ni M.\, Marcelli A.\, Nucara A\, Calvani P.\, Burattini E.\; Optical perfo
 rmances of SINBAD\, the Synchrotron INfrared Beamline At DAϕNE. J. Opt. S
 oc. Am.  2005\, 22\, 2810- 2817.\n2.	Cestelli Guidi M.\, Hotra O.\, Popov 
 A. I.\, Optical and Vibrational Spectra of CsCl-Enriched GeS2-Ga2S3 Glasse
 s Halyna Klym\, Ivan Karbovnyk\, Nanoscale Research Letters\, 2016\, 11(1)
 :132.\n3.	D’Apuzzo F.\, Piacenti A. R.\, Giorgianni F.\, Autore M.\, Ces
 telli Guidi M.\, Marcelli A.\, Schade U.\, Ito Y.\, Chen M.\, Lupi S.\, Te
 rahertz and mid-infrared plasmons in three-dimensional nanoporous graphene
 \, Nature Communications\, 2017\, 8\, 14885.\n4.	Rider M. S.\, Sokolikova 
 M.\, Hanham S. M.\, Navarro-Cia M.\, Haynes  P. D.\, Lee D. K. K.\, Daniel
 e M.\, Cestelli Guidi M.\, Mattevi C.\, Lupi S.\, Giannini V.\, Experiment
 al signature of a topological quantum dot\, Nanoscale\, 2020\, 12\, 22817-
 22825. \n5.	Giuntini L.\, Castelli L.\, Massi M.\, Fedi M.\, Czelusniak C.
 \, Gelli N.\, Liccioli L.\, Giambi F.\, Ruberto C.\, Mazzinghi A.\, Barone
  S.\, Marchegiani F.\, Nisi S.\, Lubritto C.\, Altieri S.\, Tortora L.\, B
 ranchini P.\, Fabbri A.\, Graziani V.\, Barcellos Lins S.\, Guidorzi L.\, 
 Lo Giudice A.\, Re A.\, Sottili L.\, Balerna A.\, Cestelli Guidi M.\, Pron
 ti L.\, Romani M.\, Albertin F.\, Bettuzzi M.\, Brancaccio R..\, Morigi M.
  P.\, Alloni D.\, Salvini A.\, Smilgys B.\, Prata M.\, Altieri S.\, Bonesi
 ni M.\, Di Martino D.\, Clemenza M.\, Carpinelli M.\, Oliva P.\, Sipala V.
 \, Gueli A. M.\, Pasquale S.\, Stella G.\, Pepponi G.\, Grazzi F.\, Taccet
 ti F.\, Detectors and Cultural Heritage: The INFN-CHNet Experience\, Appli
 ed Sciences\, 2021\, 11\, 3462.\n6.	Tomarchio L.\, Macis S.\, D'Arco A.\, 
 Grilli A.\, Romani M.\, Cestelli Guidi M.\, Hu K.\, Kukunuri S.\, Jeong S.
 \, Marcelli A.\, Ito Y.\, Mou S.\, Lupi S. Disordered Photonics Behavior f
 rom Terahertz to Ultraviolet of a 3- Dimensional Graphene Network\, NPG As
 ia Materials\, 2021\, 13\, 73\, 8.\n7.	Tomarchio L.\, Mosesso L.\, Macis S
 .\, Grilli A.\, Romani M.\, Cestelli Guidi M.\, Zhu Z.\, Feng X.\, Zacchig
 na M.\, Petrarca M.\, He K.\, Lupi S.\, Electrodynamics of MnBi2Te4 Intrin
 sic Magnetic Topological Insulator\, Electrodynamics of MnBi2Te4 intrinsic
  magnetic topological insulators\, NPG Asia Mater\, 2022\, 14\, 82\, 7. \n
 8.	Tomarchio L.\, Mosesso L.\, Macis S.\, Nguyen L. T.\, Grilli A.\, Roman
 i M.\, Cestelli Guidi M.\, Cava R. J.\, Lupi S.\, Phonon Anharmonicity and
  Spin–Phonon Coupling in CrI3\, Materials\, 2023\, 16\, 4909. \n9.	Cosen
 tino A.\, Terahertz and Cultural Heritage Science Examination of Art and A
 rchaeology\, Technologies\, 2016\, 4(6)\, 1-13\n10.	Fukunaga K.\, THz Tech
 nology Applied to Cultural Heritage in Practice\, Springer Tokyo\, 2016\, 
 144.\n\nhttps://indico.unina.it/event/75/contributions/1146/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1146/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Underway Projects for Innovative THz/IR Sources based on Particle 
 Accelerators: SISSI 2.0 and SABINA
DTSTART;VALUE=DATE-TIME:20240220T144000Z
DTEND;VALUE=DATE-TIME:20240220T150000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1143@cern.ch
DESCRIPTION:Speakers: Lorenzo Mosesso (Sapienza\, University of Rome\, Dep
 artment of Physics)\nTerahertz/Infrared (THz/IR) radiation and technologie
 s have found incredible development in the last few decades due to their a
 pplications in many different fields\, ranging from indoor and outdoor com
 munication\, security\, environmental monitoring\, biological research\, m
 edical applications and finally as a spectroscopic investigation tool in c
 ondensed matter [1]. However\, many of these applications requires increas
 ingly high-power sources and demands for the possibility to manipulate rad
 iation features such as pulse time duration\, frequency spectrum and polar
 ization. One of the most efficient ways of generating THz/IR radiation ful
 filling these requirements is to use relativistic electrons accelerated in
  storage rings\, where synchrotron radiation can be generated by means of 
 bending magnets or specific Insertion Devices (IDs)\, or by accelerating e
 lectrons in LINACs\, where the development of FEL technologies allows for 
 coherent and monochromatic radiation to be produced.\n \nFew projects are 
 currently underway for the realization or the upgrade of innovative THz/IR
  sources based on particle acceleration\, some of them involving two of th
 e most important research facilities in Italy\, i.e. the third-generation 
 synchrotron Elettra in Trieste and the SPARC_LAB linear accelerator in Fra
 scati.\n\nElettra 2.0 is a major upgrade of the Elettra facility towards w
 hat is called the ‘ultimate’ light source\, which will allow both hori
 zontal and vertical emittance to be greatly reduced in order to guarantee 
 a substantial increase in brilliance and coherence for the emitted radiati
 on. The main work on the structure consists in the upgrade of the magnetic
  optics without changing the basic features of the accelerator [2] and it 
 will involve all the beamlines\, including SISSI (Synchrotron Infrared Sou
 rce for Spectroscopy and Imaging)\, which is the line dedicated to the col
 lection of THz/IR radiation emitted by magnetic dipoles. The SISSI 2.0 Pro
 ject is included in this major upgrade and aims to characterize the radiat
 ion produced by this beamline focusing on the interference effects and on 
 the emergence of new edge radiation contributions caused by the complex ma
 gnetic structure of the new multi-bend achromats. In addition\, the projec
 t involves the reorganization of the extraction beamline for the transport
  of radiation to an external user facility.\n\nThe same spirit of innovati
 on is embodied by the SABINA project\, which aims to make some major upgra
 des in the SPARC_LAB structure with the practical goal of realizing a FEL 
 beamline operating as a user facility and producing quasi-monochromatic ra
 diation over a wide spectral range from 3 THz up to 30 THz\, with time dur
 ation pulses on the order of ps and energies in the mJ range. The core of 
 the beamline consists of a series of three undulators based on the APPLE-X
  design that allows the emission of high intensity synchrotron radiation a
 nd the manipulation of high electric fields (˜10 MV/cm) by controlling th
 eir polarizations (linear\, circular and elliptical). The beamline also in
 cludes the transport of the produced radiation to an ‘open to user’ la
 boratory which will be equipped with the appropriate optical set-up necess
 ary to perform a wide variety of scientific experiments concerning nonline
 ar and time-resolved optical spectroscopy.\n\nhttps://indico.unina.it/even
 t/75/contributions/1143/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1143/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terahertz saturable absorption from relativistic high-temperature 
 thermodynamics in black phosphorus
DTSTART;VALUE=DATE-TIME:20240220T140000Z
DTEND;VALUE=DATE-TIME:20240220T144000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1144@cern.ch
DESCRIPTION:Speakers: Andrea Perucchi ()\nBlack phosphorus is a unique two
 -dimensional (2D) material (Figure 1) with a tunable infrared band gap and
  anisotropic conduction properties [1]. Black phosphorus also displays the
  occurrence of a pressure-induced topological Lifshitz transition turning 
 the material from a narrow gap semiconductor to a massless Dirac metal due
  to a nonavoided band crossing [2]. We investigate the ambient pressure no
 nlinear terahertz (THz) electrodynamics of black phosphorus along the more
  conducting armchair direction and found that its THz saturable-absorption
  properties can be understood within a thermodynamic model by assuming a f
 ast thermalization of the electron bath [3]. While black phosphorus does n
 ot display the presence of massless fermions at ambient pressure and tempe
 rature the material's anomalous THz nonlinear properties can be accounted 
 for by a relativistic massive Dirac dispersion\, provided that the Fermi t
 emperature is low enough. This suggests that an optimal tuning of the Ferm
 i level could be a strategy to engineer a strong THz nonlinear response in
  other massive Dirac materials\, such as transition-metal dichalcogenides 
 or high-temperature superconductors\n\nhttps://indico.unina.it/event/75/co
 ntributions/1144/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1144/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The THz Spectral Range: a Window of Opportunities
DTSTART;VALUE=DATE-TIME:20240220T114000Z
DTEND;VALUE=DATE-TIME:20240220T120000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1156@cern.ch
DESCRIPTION:Speakers: Luigi Consolino (CNR-INO)\nWe are witnessing impress
 ive progress in THz technologies\, mostly driven by the promise of brand n
 ew application areas and different ways to interact with matter or to tran
 smit information. Such progress is also related to the under-exploitation 
 of a significant part of the electromagnetic spectrum represented by the f
 ar-infrared/THz region that borders with microwaves around 300 GHz and wit
 h mid-infrared\, around 10 THz or even higher frequencies [1\,2]. On the o
 ther hand\, the potential role of novel photonics tools in the THz range i
 s still to be unveiled but many important applications have already shown 
 its importance. Indeed\, material transparency/opacity to THz frequencies 
 is different form nearby mid-IR and can provide better resolved informatio
 n than lower frequency microwaves/RF [3]. Moreover\, for transmission of i
 nformation THz frequencies are the logical continuation of moving to highe
 r and higher frequencies to get carriers able to carry  more and more data
  [4]. In terms of interaction with matter\, THz photons are the key to exc
 ite the rotational degrees of freedom of a large part of molecules\, enabl
 ing metrological measurements to unveil new physics or also to control mol
 ecules in view of the most demanding applications on the horizon\, like ul
 tracold molecules for quantum simulation\, sensing or computing [5\,6]. \n
 \n	In these really exciting and thrilling times for THz science and techno
 logy\, it is crucial to invent proper instruments and techniques for unvei
 ling the basical physical mechanisms of new devices\, to get reliable meas
 urements of relevant parameters and to sharpen the tools for specific and 
 demanding applications. This has been the main stream of our group in Fire
 nze in the last 35 years and we will review the latest achievements relate
 d to state-of-the-art techniques and applications. In particular\, efforts
  have been directed to setting up an heterodyne technique to characterize 
 the newly generated comb patterns\, also in QCLs [7\,8] and to demonstrate
  full phase-locking of THz QCL combs [9\,10]. More recently\, we are furth
 er sharpening our photonic techniques to better understand the role of nov
 el architectures and materials in modifying QCL emission [11]. In view of 
 extending the generation domain of THz sources beyond the 5 THz transparen
 cy limit of semiconductors routinely used for QCLs fabrication\, we demons
 trated all telecom-wavelength pumped cw THz generation with simultaneous h
 igh resolution and broadband coverage up to about 7.5 THz [12\,13]. Finall
 y\, we will show novel applications that are emerging from such impressive
  THz progress\, e.g. a novel communication system at THz frequencies [14].
 \nThe Materials and Methods should be described with sufficient details. N
 ew methods and protocols should be described in detail while well-establis
 hed methods can be briefly described and appropriately cited.\n\nhttps://i
 ndico.unina.it/event/75/contributions/1156/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1156/
END:VEVENT
BEGIN:VEVENT
SUMMARY:THz-photonics by all-dielectric phonon-polariton nonlinear nanoant
 ennas
DTSTART;VALUE=DATE-TIME:20240220T104000Z
DTEND;VALUE=DATE-TIME:20240220T112000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1153@cern.ch
DESCRIPTION:Speakers: Costantino  De Angelis (University of Brescia\, Depa
 rtment of Information Engineering\, via Branze 38\, 25123 Brescia\, Italy)
 \nThe THz spectrum offers the potential of a plethora of applications\, ra
 nging from the imaging through non transparent media to wireless-over-fibe
 r communications and THz-photonics. The latter framework would greatly ben
 efit from the development of optical-to-THz wavelength converters. Exploit
 ing Difference Frequency Generation in a nonlinear all dielectric nanoante
 nna\, we propose a compact solution to this problem. The approach is compl
 etely transparent with respect to the modulation format and can be easily 
 integrated in a metasurface platform for simultaneous frequency and spatia
 l moulding of THz beams.\n\nhttps://indico.unina.it/event/75/contributions
 /1153/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1153/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terahertz Technologies as New Frontiers for Pathogenic microorgani
 sm Sensing: Drawbacks\, Potentialities and Applications
DTSTART;VALUE=DATE-TIME:20240220T092000Z
DTEND;VALUE=DATE-TIME:20240220T094000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1142@cern.ch
DESCRIPTION:Speakers: Annalisa D'Arco (Sapienza University\, Department of
  Physics)\nThe abstract is in attachment\n\nhttps://indico.unina.it/event/
 75/contributions/1142/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1142/
END:VEVENT
BEGIN:VEVENT
SUMMARY:THz wave for Cultural Heritage @ IREA-CNR
DTSTART;VALUE=DATE-TIME:20240220T090000Z
DTEND;VALUE=DATE-TIME:20240220T092000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1158@cern.ch
DESCRIPTION:Speakers: Ilaria Catapano (Istituto per il Rilevamento Elettro
 magnetico dell'Ambiente - Consiglio Nazionale delle Ricerche)\nNowadays\, 
 Teraherz (THz) waves are receiving huge attention in the frame of cultural
  heritage [1]\, [2]. THz imaging and spectroscopy are\, indeed\, useful to
 ols for gathering high-resolution (of the order of mm) information about c
 onstruction modality\, preparing drawings and author’s re-paintings\, co
 nservation state of artworks as well as to identify previous restoration a
 ctions\, mainly of paintings and frescos. \nTHz time-domain systems are pa
 rt of the imaging/mapping technological tools of the Italian node of the E
 uropean research infrastructure for heritage science (E-RIHS.it) [3]. \nSi
 nce 2014\, research activities regarding the design of strategies for impr
 oving the imaging capabilities of THz waves and their application in artwo
 rks surveys are carried out at the Institute for Electromagnetic Sensing o
 f the Environment\, National Research Council of Italy (IREA-CNR) [4].\nTh
 is communication aims at providing a critical overview of the THz potentia
 lities and describing the main challenges for a reliable and accurate data
  interpretation\; finally\, some results mainly regarding majolica and anc
 ient decorated mortar specimens will be presented\, even with the aim to p
 oint out the developed strategies to solve issues in data acquisition and 
 processing. [5]\, [6].\n\nAcknowledge\nThis study was partially funded by 
 the European Research Infrastructure for Heritage Science (E-RIHS).\n\nRef
 erences\n1.	Fukunaga\, Kaori. THz technology applied to cultural heritage 
 in practice. Springer\, 2016. \n2.	Cosentino\, Antonino. "Terahertz and cu
 ltural heritage science: examination of art and archaeology." Technologies
  4.1 (2016): 6.\n3.	https://www.e-rihs.it/en/laboratori-mobili/ (last acce
 ss Jenuary 2023).\n4.	Catapano\, Ilaria\, and Francesco Soldovieri. "THz i
 maging and data processing: State of the art and perspective." Innovation 
 in near-surface geophysics (2019): 399-417.\n5.	Catapano\, Ilaria\, et al.
  "Majolica imaging with THz waves: preliminary results." Applied Physics A
  122 (2016): 1-11.\n6.	Manca\, Rosarosa\, et al. "Non-Invasive Characteriz
 ation of Maiolica Layer Structure by Terahertz Time-Domain Imaging." Coati
 ngs 13.7 (2023): 1268.\n\nhttps://indico.unina.it/event/75/contributions/1
 158/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1158/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Micro-thermo-mechanical THz detectors
DTSTART;VALUE=DATE-TIME:20240220T080000Z
DTEND;VALUE=DATE-TIME:20240220T084000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1154@cern.ch
DESCRIPTION:Speakers: Alessandro Tredicucci ()\nThermomechanical bolometer
 s based on high-quality mechanical resonators are a promising technology f
 or broadband light detection. Further functionalities can be added by cont
 rolling the absorption spectrum of the devices. To this end\, we embedded 
 (almost-) 2D layers\, minimally impacting the mechanical quality while\, a
 t the same time\, offering strong absorbance. Further layer patterning cou
 ld grant resonant absorption\, for hyperspectral imaging or polarization s
 ensitive detection. Transduction is usually performed through optical prob
 ing of the mechanical resonance\, but direct electrical output can also be
  obtained through magnetic flux modulation\, provided the mechanical objec
 t contains an inductive element. The concept is particularly useful in arr
 ay read-out\, where many elements with different mechanical frequencies ca
 n be easily addressed in parallel.\n\nhttps://indico.unina.it/event/75/con
 tributions/1154/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1154/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terahertz imaging super-resolution
DTSTART;VALUE=DATE-TIME:20240219T152000Z
DTEND;VALUE=DATE-TIME:20240219T154000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1151@cern.ch
DESCRIPTION:Speakers: Mauro Missori (Instituite of Complex Systems\, CNR)\
 nsee attached file\n\nhttps://indico.unina.it/event/75/contributions/1151/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1151/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Exploiting THz imaging to map plastic foam density
DTSTART;VALUE=DATE-TIME:20240219T160000Z
DTEND;VALUE=DATE-TIME:20240219T162000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1159@cern.ch
DESCRIPTION:Speakers: Ilaria Catapano (Istituto per il Rilevamento Elettro
 magnetico dell'Ambiente - Consiglio Nazionale delle Ricerche)\nPlastic foa
 ms are widely used materials made by mixing polymers with a gas [1]. Their
  mechanical and physical properties are governed mainly by the density\, s
 o it is important to assess this feature to check the accuracy of the prod
 uction process. However\, while simple in principle\, density measurements
  are not straightforward in practice\, especially when objects have a non-
 uniform density. Therefore\, there is a huge interest towards the developm
 ent of effective\, possibly low-cost methodologies to accurately measure t
 he foam density and its spatial distribution.\nStarting from the observati
 on that the molecular mixture constituting the foam appears electrically h
 omogeneous at THz wavelengths\, this communication proposes an approach ba
 sed on the use of time of flight (ToF) [2] to reconstruct the foam density
  spatial map. The approach is applicable to samples whose thickness and el
 ectromagnetic parameters are such that the impinging THz wave reaches a me
 tal substrate behind the sample and neglects the possibly dispersive behav
 ior of the material under test. It provides 2D maps that describe the spat
 ial variability of the thickness and the effective refractive index of the
  sample under test\, which embeds the changes of the material refractive i
 ndex along the wave propagation path. The same idea was previously exploit
 ed for the characterization of magnetic scaffolds [3].\nTo enable the eval
 uation of the density\, a set of uniform propylene foam samples having wel
 l-known density were first realized and characterized by means of the prop
 osed approach to build a refractive index-density calibration curve. For a
  generic object under test\, this curve is used to turn the estimated effe
 ctive refractive index into a map of the density. \nThe characterization o
 f the sample depicted in Figure 1a is shown as an example of the proposed 
 approach. According to the production process procedure\, this sample is e
 xpected to be uniform\, with density ρ = 214 kg/m3\; determined by weight
 ing the sample. Figure 1b shows the estimated thickness map\, which is con
 firmed to be of about 8 mm\, without relevant geometrical changes. Figure 
 1c reports the average sample refractive index map\, which is then turned 
 into the spatial density map in Figure 1d by using the calibration curve. 
 As can be seen\, the THz inspection reveals that\, contrary to expectation
 s\, the actual density of the plastic foam sample is not uniform\, due to 
 some flaws occurring during the sample-production  process. More examples 
 and details will be given at the conference.\n \nFigure 1. THz imaging of 
 a PP foam: a) image of the sample\; b) estimated thickness\; c) estimated 
 average refractive index\; d) reconstructed foam density map.\nReferences\
 n1.	Landrock\, A. H. Handbook of plastic foams: types\, properties\, manuf
 acture and applications (Elsevier\, 1995).\n2.	Jepsen\, P. U.\, Cooke\, D.
  G.\, & Koch\, M. (2011). Terahertz spectroscopy and imaging–Modern tech
 niques and applications. Laser & Photonics Reviews\, 5(1)\, 124-166.\n3.	Z
 appia\, S.\, Scapaticci\, R.\, Lodi\, M. B.\, Fanti\, A.\, Ruello\, G.\, C
 rocco\, L.\, Catapano\, I.. “Non-Destructive Characterization of Magneti
 c Polymeric Scaffolds using Terahertz Time-of-Flight Imaging”. IEEE Tran
 sactions on Terahertz Science and Technology\, 2023.\n\nhttps://indico.uni
 na.it/event/75/contributions/1159/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1159/
END:VEVENT
BEGIN:VEVENT
SUMMARY:THz Optics for Beam Tailoring by Form-Birefringence
DTSTART;VALUE=DATE-TIME:20240219T150000Z
DTEND;VALUE=DATE-TIME:20240219T152000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1160@cern.ch
DESCRIPTION:Speakers: Can Koral (Department of Science\, University of Bas
 ilicata)\nhttps://indico.unina.it/event/75/contributions/1160/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1160/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terahertz electric-field driven dynamical multiferroicity in SrTiO
 3
DTSTART;VALUE=DATE-TIME:20240219T144000Z
DTEND;VALUE=DATE-TIME:20240219T150000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1145@cern.ch
DESCRIPTION:Speakers: Matteo Pancaldi (Department of Molecular Sciences an
 d Nanosystems\, Ca’ Foscari University of Venice\, 30172 Venice\, Italy)
 \nThe emergence of collective order in matter is among the most fundamenta
 l and intriguing phenomena in physics. In recent years\, the ultrafast dyn
 amical control and creation of novel ordered states of matter\, not access
 ible in thermodynamic equilibrium\, is receiving much attention. Among tho
 se\, the theoretical concept of dynamical multiferroicity has been introdu
 ced to describe the emergence of magnetization by means of a time-dependen
 t electric polarization in non-ferromagnetic materials [1\,2]. In simple t
 erms\, a large amplitude coherent rotating motion of the ions in a crystal
  induces a magnetic moment along the axis of rotation\, as schematically s
 hown in Figure 1. However\, the experimental verification of this effect i
 s still lacking.\nWith our work [3]\, we provide the first evidence of roo
 m temperature magnetization in the archetypal paraelectric perovskite SrTi
 O$_3$ due to dynamical multiferroicity. To achieve it\, we resonantly driv
 e the infrared-active soft phonon mode with intense circularly polarized t
 erahertz electric field\, and detect a large magneto-optical Kerr effect. 
 A simple model\, which includes two coupled nonlinear oscillators whose fo
 rces and couplings are derived from ab-initio calculations using self-cons
 istent phonon theory at finite temperature [4]\, qualitatively reproduces 
 our experimental observations in the time and frequency domains. A quantit
 atively correct magnitude of the effect is obtained when one also consider
 s the phonon analogue of the reciprocal of the Einstein - de Haas effect\,
  also called the Barnett effect\, where the total angular momentum is tran
 sferred from the coherent phonon motion to the electrons. Our findings sho
 w a new path for designing ultrafast magnetic switches by means of coheren
 t control of lattice vibrations with light.\n\nhttps://indico.unina.it/eve
 nt/75/contributions/1145/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1145/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Ultrafast THz spectroscopy of extended systems
DTSTART;VALUE=DATE-TIME:20240219T140000Z
DTEND;VALUE=DATE-TIME:20240219T144000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1147@cern.ch
DESCRIPTION:Speakers: Eugenio Cinquanta (CNR-IFN)\nIn this presentation\, 
 I will discuss the use of THz ultrafast spectroscopy to investigate extend
 ed systems. Optical Pump – THz Probe spectroscopy (OPTPs) has been exten
 sively used to investigate the carrier and lattice ultrafast dynamics in b
 ulk and low-dimensional semiconductors and topological matter [1-5]. Free 
 carriers\, electron-phonon related phenomena\, and low-energy collective o
 scillations of conduction charges show their fingerprint in the THz spectr
 al range. Moreover\, by lying close to the Fermi level\, the charge carrie
 rs photoexcited by THz waves are closely connected to DC transport. Time d
 omain detection allows the direct observation of the amplitude and phase o
 f the THz pulse that has interacted with the material. From this informati
 on\, the complex dielectric function of the material or its complex conduc
 tivity can be directly obtained\, without the need for Kramers-Kronig rela
 tions.\nI will introduce different schemes for the generation and detectio
 n of THz pulses\, the experimental configurations for measuring the charge
 -carriers dynamics\, and the procedures routinely exploited to retrieve th
 e pump-induced optical conductivity in the frequency domain from the THz f
 ields acquired in the time domain. In this respect\, I will go through som
 e technical details that are usually barely mentioned in the literature.\n
 I will then give an overview of our recent results concerning the presence
  of large polaron and exciton in 3D and 2D perovskites\, the coupling of n
 ative electron doping with far-infrared phonons in Sn-based perovskites an
 d the ultrafast carrier dynamics in the HgPSe$_3$ layered semiconductor [6
 -9].\n\nReferences\n\n1.	Ulbricht\, R.\; Hendry\, E\; Shan\, J.\; Heinz\, 
 T. F.\; and Mischa Bonn\, M. Carrier dynamics in semiconductors studied wi
 th time-resolved terahertz spectroscopy. Rev. Mod. Phys. 2011\, 83\, 543.\
 n2.	Park\, Byung Cheol\; Kim\, Tae-Hyeon\; Sim\, Kyung Ik\;  Kang\, Boyoun
 \;  Kim\, Jeong Won\; Cho\, Beongki\; Jeong\, Kwang-Ho\; Cho\, Mann-Ho\; a
 nd Kim\, Jae Hoon. Terahertz single conductance quantum and topological ph
 ase transitions in topological insulator $Bi_2Se_3$ ultrathin films. Natur
 e Communications 2015\, 6\, 6552.\n3.	Sim\, Sangwan\; Brahlek\, Matthew\; 
 Koirala\, Nikesh\; Cha\, Soonyoung\; Oh\, Seongshik\; and Choi\, Hyunyong.
  Ultrafast terahertz dynamics of hot Dirac-electron surface scattering in 
 the topological insulator $Bi_2Se_3$. Phys. Rev. B 2014\, 89\, 165137.\n4.
 	Suo\, Peng\; Zhang\, Huiyun\; Yan\, Shengnan\; Zhang\, Wenjie\; Fu\, Jibo
 \; Lin\, Xian\; Hao\, Song\; Jin\, Zuanming\; Zhang\, Yuping \; Zhang\, Ch
 ao\; Miao\, Feng\; Liang\, Shi-Jun\; and Ma\, Guohong. Observation of Nega
 tive Terahertz Photoconductivity in Large Area Type-II Dirac Semimetal $Pt
 Te_2$. Phys. Rev. Lett. 2021\, 126\, 227402.\n5.	Di Pietro\, S.\; Adhlakha
 \, N.\; Piccirilli\, F.\; Di Gaspare\, A.\; Moon\, J.\; Oh\, S.\; Di Mitri
 \, S.\; Spampinati\, S.\; Perucchi\, A.\; and Lupi\, S. Terahertz Tuning o
 f Dirac Plasmons in $Bi_2Se_3$ Topological Insulator. Phys. Rev. Lett. 202
 0\, 124\, 226403.\n6.	Cinquanta\, Eugenio\; Meggiolaro\, Daniele\, Motti\,
  Silvia G.\; Gandini\, Marina \; Alcocer\, Marcelo J. P.\; Akkerman\, Qu
 inten A.\; Vozzi\, Caterina \; Manna\, Liberato\; De Angelis\, Filippo \; 
 Petrozza\, Annamaria\; and Stagira\, Salvatore. Ultrafast THz Probe of Pho
 toinduced Polarons in Lead-Halide Perovskites. Phys. Rev. Lett. 2019\, 122
 \, 166601.\n7.	Folpini\, Giulia\; Gatto\, Lorenzo\; Cortecchia\, Daniele\,
  Devetta\, Michele\; Crippa\, Gabriele\; Vozzi\, Caterina\; Stagira\, Salv
 atore\; Petrozza\, Annamaria\; Cinquanta\, Eugenio. Ultrafast charge carri
 er dynamics in quantum confined 2D perovskite. J. Chem. Phys. 2020\, 152\,
  214705.\n8.	Gatto\, L. et al. Doping and THz phonon coupling in tin halid
 e perovskites. In preparation.\n9.	Grandi \, F. et al. Photocurrent in the
  $HgPSe_3$ layered semiconductor. In preparation.\n\nhttps://indico.unina.
 it/event/75/contributions/1147/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1147/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Polarimetry of Terahertz Pulses from two-color plasma
DTSTART;VALUE=DATE-TIME:20240219T114000Z
DTEND;VALUE=DATE-TIME:20240219T120000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1141@cern.ch
DESCRIPTION:Speakers: Domenico Paparo (CNR-ISASI)\nTerahertz (THz) generat
 ion by two-color plasma has garnered attention for its capacity of providi
 ng intense and ultra-broadband THz pulses. Like any form of electromagneti
 c radiation\, controlling wave polarization is crucial for a wide range of
  applications [1]. However\, accurately characterizing and selectively con
 trolling the polarization of broadband THz pulses remains challenging due 
 to limitations in efficient optics. \nOn the detection side\, THz air-bias
 ed coherent detection has emerged as a promising solution\, employing hete
 rodyne detection and second-harmonic generation (SHG) induced by THz radia
 tion [2]. Nevertheless\, recent research has revealed that the laser-induc
 ed air plasma in this technique can exhibit birefringence\, introducing sy
 stematic errors in polarization-state determination [3]. In a recent publi
 cation [4]\, we have proposed a simplified approach that uses a weak probe
  beam and avoids high-voltage DC bias fields. Unlike the terahertz air-bia
 sed coherent detection scheme\, our approach provides a unipolar\, intensi
 ty-proportional signal for SHG. Therefore\, we have named this technique T
 Hz Unipolar Polarimetry (TUP). In Fig. 1a an example of TUP measurement is
  shown. In this presentation we will demonstrate the absence of induced bi
 refringence in air in this experimental approach\, ensuring accurate measu
 rements of the polarization state of ultra-wideband THz pulses.\nRegarding
  the control\, we act on the two-colors process by varying the fundamental
  wave (FW) chirp and the phase difference between the FW and the second-ha
 rmonic wave (SHW). These parameters are key factors in controlling differe
 nt properties of the generated THz pulses: temporal shape\, energy\, and t
 he polarization state. Specifically\, our findings indicate that an ellipt
 ical THz polarization can be achieved under conditions where the chirp is 
 optimized for maximum generation efficiency. Furthermore\, under these opt
 imized conditions\, we observed that as the phase difference between the F
 W and SHW is increased\, the polarization axis of the ellipse undergoes co
 unterclockwise rotation. Nevertheless\, measurements conducted with chirp 
 values falling outside the optimal range result in the loss of ellipticity
  in THz radiation\, revealing polarization structures reminiscent of a 'fl
 ower' shape. In Fig. 1b we display an example of these measurements.\n\n**
 References**\n[1] W. J. Choi\, S. Cheng\, T. B. Huang\, S. Zhang\, T. B. N
 orris\, and N. A. Kotov\, “Terahertz circular dichroism spectroscopy of 
 biomaterials enabled by kirigami polarization modulators\,” Nat. Mater. 
 18\, 820–826 (2019).\n[2] Z. H. Lu\, D. W. Zhang\, C. Meng\, L. Sun\, Z.
  Y. Zhou\, Z. X. Zhao\, and J. M. Yuan\, “Polarization-sensitive air-bia
 sed-coherent-detection for terahertz wave\,” Appl. Phys. Lett. 101\, 081
 119 (2012).\n[3] J. Zhang\, “Polarization-dependent study of THz air-bia
 sed coherent detection\,” Opt. Lett. 39\, 4096–4099 (2014).\n[4] S. Mo
 u\, Q. Yu\, A. Rubano\, D. Paparo\, “Terahertz unipolar polarimetry by s
 econd-harmonic generation in air\,” Appl. Phys. Lett. 123\, 071101 (2023
 ).\n\nhttps://indico.unina.it/event/75/contributions/1141/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1141/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Terahertz Spectroscopy and Topological Quantum Materials
DTSTART;VALUE=DATE-TIME:20240219T104000Z
DTEND;VALUE=DATE-TIME:20240219T112000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1157@cern.ch
DESCRIPTION:Speakers: Stefano Lupi (Department of Physics and INFN\, Sapie
 nza University of Rome)\nQuantum materials and terahertz radiation present
  a mutual interplay. On one hand\, linear terahertz spectroscopy allows to
  study the unconventional excitations of quantum materials and nonlinear a
 nd time-resolved spectroscopy their temporal evolution. On the other hand\
 , quantum materials can be used to produce and manipulate terahertz radiat
 ion\, opening up the possibility of developing new devices and application
 s. \nIn this talk\, I will review our recent results on the investigation 
 of topological quantum materials through linear and pump-probe terahertz s
 pectroscopy and their use for generating terahertz radiation with unconven
 tional properties.\n\nhttps://indico.unina.it/event/75/contributions/1157/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1157/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Infrared Plasmons in Quantum Materials
DTSTART;VALUE=DATE-TIME:20240219T094000Z
DTEND;VALUE=DATE-TIME:20240219T100000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1148@cern.ch
DESCRIPTION:Speakers: Salvatore Macis (Sapienza University)\nSurface plasm
 ons\, the collective oscillations of electrons in metals and doped semicon
 ductors\, show outstanding electromagnetic (EM) properties spanning from a
  reduced wavelength in comparison to that of an exciting electromagnetic f
 ield\, an extreme electric field enhancement several orders of magnitude l
 arger than the incident field\, to several nonlinear effects like harmonic
  generation and optical rectification. Although conventional metals\, like
  gold and silver\, are usually used in plasmonics\, non-conventional and e
 xotics materials now on the scientific edge\, providing additional propert
 ies like plasmon tunability due to their extreme sensitivity to external p
 arameters like doping\, temperature\, and electric and magnetic fields.\nI
 n this work we present the generation of surface plasmon polariton in two 
 quantum materials\, patterned in the form of micro-ribbon arrays: the ultr
 ahigh conductive PdCoO2 oxide and the Wey-II semimetal PtTe2.\nPdCoO2 laye
 red delafossite is the most conductive compound among metallic-oxides\, wi
 th a room-temperature resistivity of nearly 2 µΩcm\, corresponding to a
  mean free path of about 600Å1. These values represent a record consideri
 ng that the charge density of PdCoO2 is three times lower than copper [1].
  PtTe2 is a Weyl semimetal\, with topological nontrivial properties and th
 e highest room-temperature electrical conductivity among metallic Transiti
 on Metal Dichalcogenides [2]. By changing the width W and period 2W of the
  ribbon arrays\, we select suitable values of the plasmon wavevector q\, e
 xperimentally sampling the surface plasmon dispersion (see Fig.1 for PdCoO
 2) in the mid-infrared electromagnetic region. Near the ribbon edge\, we o
 bserve a strong field enhancement due to the plasmon confinement\, indicat
 ing both materials as a promising infrared plasmonic candidates [3\,4].\n\
 n[1] Brahlek\, M. et al. Growth of metallic delafossite PdCoO2 by molecula
 r beam epitaxy. Phys. Rev. Mat. 3\, 093401 (2019).\n[2] Hao\, S. et al. Lo
 w-Temperature Eutectic Synthesis of PtTe2 with Weak Antilocalization and C
 ontrolled Layer Thinning Adv. Funct. Mater.\, 28\, 1803746 (2018).\n[3] Ma
 cis\, S. et al.\, Infrared Plasmons in Ultrahigh Conductive PdCoO2 Metalli
 c Oxide. Communications Physics\, 5(1)\, 1-6\, (2022).\n[4] Macis\, S. et 
 al. Terahertz and Infrared Plasmon Polaritons in PtTe2 Type-II Dirac Topol
 ogical Semimetal Nature Communications\, submitted (2023).\n\nhttps://indi
 co.unina.it/event/75/contributions/1148/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1148/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High repetition rate THz generation by cavity enhanced optical rec
 tification in GaP
DTSTART;VALUE=DATE-TIME:20240219T090000Z
DTEND;VALUE=DATE-TIME:20240219T092000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1150@cern.ch
DESCRIPTION:Speakers: Gianluca Galzerano (Istituto di Fotonica e Nanotecno
 logie - CNR)\nTerahertz (THz) radiation exhibits properties of great inter
 est and potential applications in several scientific fields. For example\,
  THz waves (in the spectral range between 0.1 and 30 THz) find direct appl
 ications in spectroscopy of innovative materials\, time-domain quantum opt
 ics\, and biological sensing [1]. However\, THz science remains challengin
 g because of the lack of suitable sources and detectors. To fill this tech
 nological gap\, various techniques have been explored over the years. For 
 instance\, quantum cascade lasers and photoconductive antennas are well-es
 tablished methods to generate THz radiation [2]. Recently\, frequency down
 -conversion of near-infrared light in nonlinear crystals emerged as a powe
 rful alternative to more traditional methods. In particular\, optical rect
 ification schemes based on ytterbium (Yb) ultrafast lasers are now conside
 red extremely promising [3]. Moreover\, the use of an enhancement resonato
 r able to store the infrared pulses from the Yb laser source boosts the po
 wer that can be used for optical rectification [4]. However\, high-average
  power leads to a high thermal load for the nonlinear crystal. In addition
 \, spatial deformation of the resonant mode can occur when the crystal is 
 under stress inside the cavity\, causing power losses and THz power drops.
  A crystal widely used is Gallium Phosphide (GaP) [5]. Recently\, Hekmat e
 t al. [6] published an extensive study on the behavior of this crystal whe
 n used for single pass optical rectification in the presence of high power
 . In this work\, we propose a preliminary study in a slightly different re
 gime of operation for GaP crystals\, exploiting an enhancement resonator t
 o achieve an average power > 300 W. This offers the chance to investigate 
 the material properties at very high power together with the possibility o
 f understanding the effect of GaP-induced mode deformation inside an enhan
 cement cavity. We propose an experimental setup based on a amplified Yb fi
 ber mode-locking laser (spectral width ~ 7 nm around 1035 nm) with a repet
 ition rate of nearly 100 MHz\, with maximum power of 60 W\, and a pulse le
 ngth of 370 fs. The amplified pulses are boosted to nearly 300 W using an 
 enhancement cavity inside which optical rectification in a GaP crystal tak
 es place. This way\, modal instabilities and high-power-induced effects on
  GaP are observable and characterizable together with the THz generation e
 fficiency. Even if modal instabilities partially limit the maximum gain ac
 hievable with the enhancement cavity\, the comprehension of the phenomenon
  will soon allow the implementation of mitigation strategies to fully expl
 oit the advantage of optical rectification in an enhancement cavity for th
 e high repetition rate and the milliwatt level average power THz generatio
 n\, opening the way to promising applications in the THz region.\n\n**Refe
 rence**\n\n[1] A. Leitenstorfer et al.\, “The 2023 terahertz science and
  technology roadmap\,” J. Phys. D: Appl. Phys. 56\, 22\, 223001 (2023).\
 n\n[2] P. U. Jepsen et al.\, “Terahertz spectroscopy and imaging – Mod
 ern techniques and applications\,” Laser Photonics Rev. 5\, 1\, 124-166 
 (2011).\n\n[3] J. Drs at al.\, “Optical rectification of ultrafast Yb la
 sers: pushing power and bandwidth of terahertz generation in GaP\,” JOSA
  B 36\, 11\, 3039 (2019).\n\n[4] Suerra et al. "Generation of high repetit
 ion rate THz radiation at the millwatt-level via optical rectification in 
 an enhancement cavity\," EPJ Web of Conferences\, 08021 (2023).\n\n[5] J. 
 Li et al.\, “Generation of 0.3 mW high-power broadband terahertz pulses 
 from GaP crystal pumped by negatively chirped femtosecond laser pulses\,
 ” Laser Phys. Lett. 10\, 125404 (2013).\n\nhttps://indico.unina.it/event
 /75/contributions/1150/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1150/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Optical beatnote detection of a portable THz QCL comb by direct mi
 crowave mixing onto an Hot-electron bolometer
DTSTART;VALUE=DATE-TIME:20240219T084000Z
DTEND;VALUE=DATE-TIME:20240219T090000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1149@cern.ch
DESCRIPTION:Speakers: Sara Cibella (IFN CNR)\nWe present optical beatnote 
 detection from a THz\nQCL comb operating at 80 K by direct free space mixi
 ng in a high-frequency Hot Electron Bolometer\n\nhttps://indico.unina.it/e
 vent/75/contributions/1149/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1149/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chip-scale Terahertz quantum cascade lasers frequency combs: recen
 t advances and applications in near-field nanoscopy
DTSTART;VALUE=DATE-TIME:20240219T080000Z
DTEND;VALUE=DATE-TIME:20240219T084000Z
DTSTAMP;VALUE=DATE-TIME:20260909T183552Z
UID:indico-contribution-75-1155@cern.ch
DESCRIPTION:Speakers: Miriam Serena Vitiello (CNR\, Istituto Nanoscienze)\
 nOptical frequency combs (FCs)\, that establish a rigid phase-coherent lin
 k between the microwave and optical domains of the electromagnetic spectru
 m\, are emerging as a key high-precision tools for the development of quan
 tum technology platforms. These include potential applications for communi
 cation\, computation\, information\, sensing and metrology\, and can exten
 d from the near-infrared with micro-resonator combs\, up to the technologi
 cally attractive terahertz (THz) frequency range\, where powerful and mini
 aturized quantum cascade laser (QCL) can spontaneously generate stable FCs
 . In this talk I’ll review our recent advances in the development of sta
 ble THz QCL FCs and harmonic frequency combs with record optical power/mod
 e and record dynamic range and I’ll discuss their application potential 
 in the fascinating area of near-field nanoscopy.\n\nhttps://indico.unina.i
 t/event/75/contributions/1155/
LOCATION:Federico II Conference Center Aula B
URL:https://indico.unina.it/event/75/contributions/1155/
END:VEVENT
END:VCALENDAR