Improved sensitivity of terahertz detection by GaAs photoconductive antennas excited at 1560 nm
Improved sensitivity of terahertz detection by GaAs photoconductive antennas excited at 1560 nm
复制标题
DOI：
10.1063/1.3519480
复制
发表时间：
2010-11
影响因子：
4
通讯作者：
Takeshi Kataoka;Keisuke Kajikawa;J. Kitagawa;Y. Kadoya;Yasuhiro Takemura
中科院分区：
文献类型：
--
作者：
Takeshi Kataoka;Keisuke Kajikawa;J. Kitagawa;Y. Kadoya;Yasuhiro Takemura
重新审视了基于低温生长（LTG）GaAs的光导天线（PCA）在1.5 μm脉冲激发下的太赫兹检测。我们发现，通过减小PCA的激发光斑尺寸和差距长度，可以提高探测效率10倍（20 dB），同时保持了LTG GaAs上PCA的低噪声特性。结果表明，在9.5 mW的合理入射功率下，信噪比大于50 dB，表明该方案在实际的时域系统中具有良好的应用前景。
The terahertz detection by photoconductive antennas (PCAs) based on low-temperature grown (LTG) GaAs with 1.5 μm pulse excitation was revisited. We found that the detection efficiency can be improved by a factor of 10 (20 dB) by reducing the excitation spot size and the gap length of the PCA, maintaining the low noise feature of the PCA on LTG GaAs. As a result, the signal-to-noise ratio higher than 50 dB was obtained at a reasonable incident power of 9.5 mW, suggesting that the scheme is promising for the detection of terahertz waves in practical time domain systems.