BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN 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:20260608T020739Z UID:indico-contribution-237-1163@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:THz dynamics of aqueous binary mixtures at a mesoscopic level DTSTART;VALUE=DATE-TIME:20240220T094000Z DTEND;VALUE=DATE-TIME:20240220T100000Z DTSTAMP;VALUE=DATE-TIME:20260608T020739Z UID:indico-contribution-237-1161@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 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:20260608T020739Z UID:indico-contribution-237-1142@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:20260608T020739Z UID:indico-contribution-237-1158@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:20260608T020739Z UID:indico-contribution-237-1154@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 END:VCALENDAR