Photo-Doped Active Electrically Controlled Terahertz Modulator

Photo-Doped Active Electrically Controlled Terahertz Modulator

We demonstrate an electric-controlled terahertz（THz） modulator which can be used to realize amplitude modulation of terahertz waves with slight photo-doping. The THz pulse transmission was efficiently modulated by electrically controlling the monolayer silicon-based device. The modulation depth reac...

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Veröffentlicht in:电子科技学刊 2015, Vol.13 (2), p.113-116
1. Verfasser: Bo Zhang Liang Zhong Ting He Jing-Ling Shen
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Sprache:eng
Schlagworte:
太赫兹波
太赫兹脉冲
振幅调制
掺杂
有源
激光强度
电光调制器
电压降低
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creator Bo Zhang Liang Zhong Ting He Jing-Ling Shen
description We demonstrate an electric-controlled terahertz（THz） modulator which can be used to realize amplitude modulation of terahertz waves with slight photo-doping. The THz pulse transmission was efficiently modulated by electrically controlling the monolayer silicon-based device. The modulation depth reached 100% almost when the applied voltage was 7V at an external laser intensity of 0.6W/cm2. The saturation voltage reduced with the increase of the photo-excited intensity. In a THz continuous wave（CW）system, a significant fall in both THz transmission and reflection was also observed with the increase of applied voltage. This reduction in the THz transmission and reflection was induced by the absorption for electron injection. The results show that a high-efficiency and high modulation depth broadband electric-controlled terahertz modulator in a pure Si structure has been realized.
doi_str_mv 10.3969/j.issn.1674-862X.2015.02.005
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subjects 太赫兹波
太赫兹脉冲
振幅调制
掺杂
有源
激光强度
电光调制器
电压降低
title Photo-Doped Active Electrically Controlled Terahertz Modulator
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