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SUMMARY:Amplification of THz Radiation by Strong Interaction of Drifting E
 lectrons with Plasmons in Graphene and GaN
DTSTART;VALUE=DATE-TIME:20220707T094500Z
DTEND;VALUE=DATE-TIME:20220707T103000Z
DTSTAMP;VALUE=DATE-TIME:20260909T103956Z
UID:indico-contribution-785@events.ncbj.gov.pl
DESCRIPTION:Speakers: Wojciech Knap (CENTERA Laboratories\, Institute of H
 igh Pressure Physics PAS\, Warsaw)\nMore than 40 years ago\, a new directi
 on in physics opened up with the arrival of plasma-wave electronics. The p
 ossibility that the plasma waves could propagate faster than electrons fas
 cinated all. Therefore\, it was initially expected that plasmonic devices\
 , including detectors and generators of electromagnetic radiation\, would 
 be able to work effectively in the very high frequencies - terahertz (THz)
  range\, inaccessible to standard electronic devices. However\, numerous e
 xperimental attempts to realize the amplifiers or emitters failed: the int
 ensity of radiation turned out to be too small\, plasma resonances too bro
 ad\, or devices operated only at cryogenic temperatures. \nWe demonstrate 
 – for the first time- experimentally strong interaction of  resonant pla
 smons in Graphene with drifting electrons leading to THz radiation amplifi
 cation with a gain going up to 9%. The results are interpreted using a dis
 sipative plasmonics crystal model\, which captures some trends and basic p
 hysics of the amplification phenomena but is far from being completed [1] 
 .\nWe will present challenges of both experimental and theoretical researc
 h on the strong plasmons-drifting electrons- THz light interaction in Dira
 c matter  - that were recently (2022) recognized as an important research 
 direction  by EU commission -  awarding ERC -Advanced grant –“TERAPLAS
 M” that will be realized by  CENTERA laboratory – UNIPRESS-PAN in cons
 ortium with CEZAMAT – Technical University of Warsaw and in collaboratio
 n with teams from Japan France Germany\n\n[1] Boubanga-Tombet S\, Knap W\,
  Yadav D\, Satou A\, But DB\, Popov VV\, Gorbenko IV\, Kachorovskii V\, Ot
 suji T: Room-Temperature Amplification of THz Radiation by Grating-Gate Gr
 aphene Structures. Phys Rev X 2020\; 10(( 3): 031004. [DOI: 10.1103/PhysRe
 vX.10.031004]\n\nhttps://events.ncbj.gov.pl/event/75/contributions/785/
LOCATION:Novotel Warszawa Centrum Róża
URL:https://events.ncbj.gov.pl/event/75/contributions/785/
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