太赫兹辐射
照相混合
光电子学
太赫兹光谱与技术
光电导性
材料科学
太赫兹间隙
等离子体子
太赫兹时域光谱学
光学
半导体
超短脉冲
天线(收音机)
光电探测器
探测器
远红外激光器
激光器
物理
电信
计算机科学
太赫兹超材料
作者
Ping-Keng Lu,Mona Jarrahi
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2023-02-15
卷期号:31 (6): 9319-9319
被引量:9
摘要
We present a telecommunication-compatible frequency-domain terahertz spectroscopy system realized by novel photoconductive antennas without using short-carrier-lifetime photoconductors. Built on a high-mobility InGaAs photoactive layer, these photoconductive antennas are designed with plasmonics-enhanced contact electrodes to achieve highly confined optical generation near the metal/semiconductor surface, which offers ultrafast photocarrier transport and, hence, efficient continuous-wave terahertz operation including both generation and detection. Consequently, using two plasmonic photoconductive antennas as a terahertz source and a terahertz detector, we successfully demonstrate frequency-domain spectroscopy with a dynamic range more than 95 dB and an operation bandwidth of 2.5 THz. Moreover, this novel approach to terahertz antenna design opens up a wide range of new possibilities for many different semiconductors and optical excitation wavelengths to be utilized, therefore bypassing short-carrier-lifetime photoconductors with limited availability.
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