Quantum dot photoconductive antenna-based compact setups for terahertz spectroscopy and imaging
Quantum dot photoconductive antenna-based compact setups for terahertz spectroscopy and imaging
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DOI：
10.1117/12.2567630
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发表时间：
2020-08
期刊：
影响因子：
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通讯作者：
Andrei Gorodetsky;A. Yadav;S. Smirnov;N. Bazieva;E. Rafailov
中科院分区：
文献类型：
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作者：
Andrei Gorodetsky;A. Yadav;S. Smirnov;N. Bazieva;E. Rafailov
我们提出了在过去的五年中获得的量子点光电导天线的基础上的紧凑的太赫兹设置的发展的结果的概述。我们证明了InAs/GaAs量子点为基础的设置成为一个有效的方法，紧凑，室温操作CW和脉冲太赫兹光谱和成像设置的潜力。我们描述了量子点衬底中的光电子过程，揭示了量子点在自由载流子寿命和超快光电流形成中的作用。我们证明了所提出的天线的操作模式在脉冲和CW制度下的谐振（载流子只在量子点内部被激发）和非谐振（载流子在衬底的体积中被激发）泵与紧凑的量子点半导体激光器。结果允许建议量子点为基础的设置作为一种新的方法，现场条件紧凑的太赫兹源成像和光谱。
We present the overview of the results on the development of compact THz setups based on the quantum dot photoconductive antennas obtained during the past five years. We demonstrate the potential of the InAs/GaAs Quantum-Dot based setups to become an efficient approach to compact, room-temperature operating CW and pulsed terahertz setups for spectroscopy and imaging. We describe the photoelectronic processes in quantum dot substrates and reveal the role of quantum dots in free carrier lifetimes and the formation of the ultrafast photocurrent. We demonstrate the operation mode of the proposed antennas in pulsed and CW regimes under resonant (carriers are excited only inside the quantum dots) and off-resonant (carriers are excited in the bulk volume of the substrate) pumps with compact quantum dot semiconductor lasers. The results allow suggesting the quantum dot based setups as a new approach to field condition compact THz sources for imaging and spectroscopy.