Photon-counting microscopy of terahertz radiation

作者：Kenji Ikushima, Yasuhiro Yoshimura, Takuma Hasegawa, Susumu Komiyama, Takeji Ueda, Kazuhiko Hirakawa · 发表于：Applied Physics Letters · 年份：2006 · DOI：10.1063/1.2194473 · 被引用次数：49 · 研究领域：Terahertz technology and applications、Semiconductor Quantum Structures and Devices、Photonic and Optical Devices

Photon-counting imaging of terahertz radiation is demonstrated with a spatial resolution of 50μm for a free-space wavelength of 132μm by incorporating a quantum-dot single photon detector into a scanning confocal optical system. Terahertz radiation of 10−19–10−16W or 102–105photons∕s is imaged. Applying the microscope to the study of semiconductor quantum Hall devices, a threshold behavior of the cyclotron emission is found and the mechanism is discussed.