Acta Optica Sinica, Volume. 41, Issue 24, 2411002(2021)
A Light-Emitting Diode-Based Strong-Field Terahertz Camera
A strong-pulsed-field terahertz camera based on light emitting diode (LED) is reported in this paper. It is based on the operational principle that LED can generate nanosecond pulse-duration photovoltaic signal with a reproducible response to picosecond pulse-duration intense terahertz irradiation due to impact ionization when terahertz electric field strength is larger than 50 kV/cm. By employing this effect, we fabricate scanning and array LED-terahertz cameras. These devices have successfully captured images of focused terahertz beam profile generated in lithium niobate via the tilted pulse front technique. The proposed camera has characteristics of low cost, strong photovoltaic signal, rapid response, and large imaging area. Meanwhile, it would give a new idea in developing terahertz imaging technology based on strong-field nonlinear effect.
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Shangqing Li, Chen Ouyang, Jinglong Ma, Baolong Zhang, Xiaojun Wu, Jihong Xu, Yutong Li. A Light-Emitting Diode-Based Strong-Field Terahertz Camera[J]. Acta Optica Sinica, 2021, 41(24): 2411002
Category: Imaging Systems
Received: Apr. 12, 2021
Accepted: Jun. 22, 2021
Published Online: Nov. 30, 2021
The Author Email: Wu Xiaojun (xiaojunwu@buaa.edu.cn), Li Yutong (ytli@iphy.ac.cn)