Coherent detection of mid-infrared radiation up to 60 THz with an LT-GaAs photoconductive antenna
Coherent detection of mid-infrared radiation up to 60 THz with an LT-GaAs photoconductive antenna
复制标题
使用 LT-GaAs 光电导天线对高达 60 THz 的中红外辐射进行相干检测
DOI：
10.1049/ip-opt:20020262
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
K. Sakai
中科院分区：
文献类型：
--
作者：
S. Kono;M. Tani;K. Sakai
研究了用15 fs激光脉冲门控的低温生长GaAs光导（PC）天线对太赫兹（THz）辐射进行超宽带探测的激振器调制技术。用激振器调制的时间分辨波形的分化有利于在不降低信噪比的情况下增强检测辐射的高频成分，因为由门控载波数的时间分布决定的PC响应函数随着频率的增加而迅速减小。通过对PC检测和电光检测的信噪比的定量比较，表明基于激振器调制技术的PC辐射检测具有广阔的光谱应用前景。对高达60太赫兹的辐射进行了检测。
The shaker modulation technique is demonstrated for ultrabroadband detection of terahertz (THz) radiation with a low-temperature-grown GaAs photoconductive (PC) antenna gated with 15 fs laser pulses. The differentiation of the time-resolved waveforms with the shaker modulation is advantageous to enhance the high-frequency components of the detected radiation without degrading the signal-to-noise ratio (SNR) because the PC response function determined by the temporal profile of the gating carrier number rapidly decreases with the increase in frequency. With the quantitative comparison of SNR between PC and electro-optic detection, the PC detection of radiation with the shaker modulation technique is promising for further spectroscopic application. The detection of radiation up to 60 THz is demonstrated.