Spectral Narrowing Effect of a Novel Super-Grating Dual-Gate Structure for Plasmon-Resonant Terahertz Emitter
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概要
- 論文の詳細を見る
We have proposed a terahertz (THz) emitter utilizing two-dimensional plasmons (2DPs) in a super-grating dual-gate (SGG) high electron mobility transistor (HEMT). The plasmon under each grating gate has a unique feature that its resonant frequency is determined by the plasma-wave velocity over the gate length. Since the drain bias voltage causes a linear potential slope from the source to drain area, the sheet electron densities in periodically distributed 2DP cavities are dispersed. As a result, all the resonant frequencies are dispersed and undesirable spectral broadening occurs. A SGG structure can compensate for the sheet electron density distribution by modulating the grating dimension. The finite difference time domain simulation confirms its spectral narrowing effect. Within a wide detuning range for the gate and drain bias voltages giving a frequency shifting of ±0.5THz from an optimum condition, the SGG structure can preserve the spectral narrowing effect.
- (社)電子情報通信学会の論文
- 2009-05-01
著者
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Otsuji Taiichi
Research Institute Of Electrical Communication Tohoku University
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Kang HyunChul
Research Institute of Electrical Communication, Tohoku University
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Nishimura Takuya
Research Institute of Electrical Communication, Tohoku University
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Kang Hyunchul
Research Institute Of Electrical Communication Tohoku University
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MAGOME Nobuhiro
Research Institute of Electrical Communication, Tohoku University
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Magome Nobuhiro
Research Institute Of Electrical Communication Tohoku University
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Nishimura Takuya
Research Institute Of Electrical Communication Tohoku University
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Otsuji Taiichi
Research Institute for Electrical Communication, Tohoku University, Sendai 980-8577, Japan
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