Abstract-Giant amplification of terahertz plasmons in a double-layer graphene

Mikhail Morozov,  Ilya Moiseenko,  Vyacheslav Popov,

http://iopscience.iop.org/article/10.1088/1361-648X/aaa648/pdf

Amplification of terahertz plasmons in a pair of parallel active graphene monolayers is studied theoretically. Plasmon wave in symmetric double-layer graphene structure splits into two branches with a symmetric and an antisymmetric distribution of tangential to graphene component of the electric field across the plane of symmetry of the structure. It is shown that normalized to the wavelength terahertz plasmon amplification factor of the symmetric mode in the double-layer graphene structure could be greater than that in a single graphene layer by 4 orders of magnitude.

Abstract-Emission and detection of terahertz radiation using two-dimensional plasmons in semiconductor nanoheterostructures for nondestructive evaluations

Taiichi Otsuji ; Takayuki  ; Stephane Albon Boubanga Tombet ;Akira Satou ; Victor Ryzhii ; Vyacheslav Popov ; Wojciech Knap

http://opticalengineering.spiedigitallibrary.org/article.aspx?articleid=1787281&journalid=92

Taiichi Otsuji

Tohoku University, Research Institute of Electrical Communication, 9808577 Sendai, Japan

Takayuki Watanabe

Tohoku University, Research Institute of Electrical Communication, 9808577 Sendai, Japan

Stephane Albon Boubanga Tombet

Tohoku University, Research Institute of Electrical Communication, 9808577 Sendai, Japan

Akira Satou

Tohoku University, Research Institute of Electrical Communication, 9808577 Sendai, Japan

Victor Ryzhii

Tohoku University, Research Institute of Electrical Communication, 9808577 Sendai, Japan

Vyacheslav Popov

Russian Academy of Science, Kotelnikov Institute of Radio Engineering and Electronics (Saratov Branch), 410019 Saratov, Russia

Wojciech Knap

University of Montpellier-CNRS, LC2 Laboratories, UMR 5221, 34095 Montpellier, France

Opt. Eng. 53(3), 031206 (Nov 27, 2013). doi:10.1117/1.OE.53.3.031206

History: Received May 23, 2013; Revised August 31, 2013; Accepted October 28, 2013

Abstract


The recent advances in emission and detection of terahertz radiation using two-dimensional (2-D) plasmons in semiconductor nanoheterostructures for nondestructive evaluations are reviewed. The 2-D plasmon resonance is introduced as the operation principle for broadband emission and detection of terahertz radiation. The device structure is based on a high-electron-mobility transistor and incorporates the authors’ original asymmetrically interdigitated dual-grating gates. Excellent THz emission and detection performances are experimentally demonstrated by using InAlAs/InGaAs/InP and/or InGaP/InGaAs/GaAs heterostructure material systems. Their applications to nondestructive material evaluation based on THz imaging are also presented.

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