| 低温生长砷化镓光电导天线产生太赫兹波的辐射特性 |
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| 引用本文： | 石小溪,赵国忠,张存林,崔利杰,曾一平.低温生长砷化镓光电导天线产生太赫兹波的辐射特性[J].中国激光,2008,35(3):396-400. |
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| 作者姓名： | 石小溪 赵国忠 张存林 崔利杰 曾一平 |
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| 作者单位： | 1. 首都师范大学物理系,北京,100037
2. 中国科学院半导体研究所,北京,100083 |
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| 基金项目： | 国家自然科学基金
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北京市自然科学基金
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北京市教委科技发展计划项目 |
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| 摘 要： | 研究了低温生长砷化镓光电导天线(LT-GaAs PCA)产生太赫兹(THz)波的辐射特性。利用太赫兹时域光谱(TDS)技术测量了光电导发射极在飞秒激光作用下辐射的太赫兹脉冲,得到了时域发射光谱,并通过快速傅里叶变换(FFT)得到相应的频域光谱。结果表明,低温砷化镓光电导天线产生的太赫兹波信号比飞秒激光激发半导体表面产生的太赫兹波信号具有更高的强度和信噪比;太赫兹波信号与光电导天线的偏置电压成线性关系;随着抽运激光功率的增强,太赫兹波信号增大并出现饱和。
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| 关 键 词： | 光谱学 太赫兹波 时域光谱测量 低温生长砷化镓 光电导天线 |
| 收稿时间： | 2007/10/11 |
Terahertz Radiation Properties of Low-Temperature-Grown GaAs Photoconductive Antenna |
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| Shi Xiaoxi,Zhao Guozhong,Zhang Cunlin,Cui Lijie,Zeng Yiping.Terahertz Radiation Properties of Low-Temperature-Grown GaAs Photoconductive Antenna[J].Chinese Journal of Lasers,2008,35(3):396-400. |
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| Authors: | Shi Xiaoxi Zhao Guozhong Zhang Cunlin Cui Lijie Zeng Yiping |
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| Abstract: | The terahertz(THz) radiation properties of low-temperature-grown GaAs photoconductive antenna(LT-GaAs PCA) are studied in order to improve the THz radiation efficiency.The emission spectra of the photoconductive antenna are obtained by THz time domain spectroscopy(TDS) technology.The corresponding frequency domain spectra are obtained by fast Fourier transform(FFT).The results show that the THz signal generated by LT-GaAs PCA is more efficient than that generated by femtosecond electromagnetic pulse from semiconductor surface.The peak of THz electric field increases linearly as bias voltage increasing,and tends to saturation as pump power increasing. |
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| Keywords: | spectroscopy terahertz wave time domain spectroscopy measurement low-temperature-grown GaAs photoconductive antenna |
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