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SUMMARY:THz amplitude modulation by organic-based metadevices
DTSTART;VALUE=DATE-TIME:20240219T092000Z
DTEND;VALUE=DATE-TIME:20240219T094000Z
DTSTAMP;VALUE=DATE-TIME:20260907T125803Z
UID:indico-contribution-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/
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