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Proceedings Paper

Giant terahertz gain by excitation of surface plasmon polarities in optically pumped graphene
Author(s): Taiichi Otsuji; Takayuki Watanabe; Stephane Boubanga Tombet; Akira Satou; Alexander A. Dubinov; Vladimir Ya. Aleshkin; Vladimir Mitin; Victor Ryzhii
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Paper Abstract

Interband photoexcitation in monolayer graphene can produce a weak gain in the terahertz range by only up to 2.3%, but exciting the surface plasmon polaritons mediates the light-matter interaction, resulting in a giant terahertz gain. Nonlinear carrier relaxation/recombination dynamics and resultant stimulated terahertz (THz) photon emission with excitation of surface plasmon polaritons (SPPs) in photoexcited monolayer graphene has been experimentally studied using optical-pump/THz-probe and optical-probe measurement. We observed the spatial distribution of the THz probe pulse intensities under linear polarization of optical pump and THz probe pulses. It was clearly observed that intense THz probe pulse was detected only at the area where the incoming THz probe pulse takes a TM mode being capable of exciting the SPPs. The observed gain factor is in fair agreement with theoretical calculations.

Paper Details

Date Published: 21 May 2014
PDF: 5 pages
Proc. SPIE 9102, Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense, 91020I (21 May 2014); doi: 10.1117/12.2055376
Show Author Affiliations
Taiichi Otsuji, Tohoku Univ. (Japan)
Takayuki Watanabe, Tohoku Univ. (Japan)
Stephane Boubanga Tombet, Tohoku Univ. (Japan)
Akira Satou, Tohoku Univ. (Japan)
Alexander A. Dubinov, Lobachevsky State Univ. of Nizhny Novgorod (Russian Federation)
Vladimir Ya. Aleshkin, Lobachevsky State Univ. of Nizhny Novgorod (Russian Federation)
Vladimir Mitin, Univ. at Buffalo (United States)
Victor Ryzhii, Tohoku Univ (Japan)


Published in SPIE Proceedings Vol. 9102:
Terahertz Physics, Devices, and Systems VIII: Advanced Applications in Industry and Defense
Mehdi F. Anwar; Thomas W. Crowe; Tariq Manzur, Editor(s)

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