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Acta Optica Sinica, Volume. 41, Issue 24, 2411002(2021)

A Light-Emitting Diode-Based Strong-Field Terahertz Camera

Shangqing Li1,2, Chen Ouyang1,2, Jinglong Ma1, Baolong Zhang1,2, Xiaojun Wu3、**, Jihong Xu4, and Yutong Li1,2,5、*
Author Affiliations
  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 2School of Physical Sciences, Chinese Academy of Sciences, Beijing 100049, China
  • 3School of Electronic and Information Engineering, Beihang University, Beijing 100191, China
  • 4Beijing Office, Texas Instruments Inc., Beijing 100190, China
  • 5Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
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    Figures & Tables(6)
    Photovoltaic response of LED to intense terahertz radiation. (a) Experimental setup; (b) terahertz-field-induced photovoltaic signal in two typical LEDs; (c) schematic of abnormal photovoltaic response mechanism; (d) linear relationship between Vpp of LED signal and terahertz pump fluence

    Fig. 1. Photovoltaic response of LED to intense terahertz radiation. (a) Experimental setup; (b) terahertz-field-induced photovoltaic signal in two typical LEDs; (c) schematic of abnormal photovoltaic response mechanism; (d) linear relationship between Vpp of LED signal and terahertz pump fluence

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    Automatic scanning LED-terahertz camera with single pixel. (a) Framework; (b) flow chart of LabView program

    Fig. 2. Automatic scanning LED-terahertz camera with single pixel. (a) Framework; (b) flow chart of LabView program

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    Test results of scanning LED-THz camera. (a) Scanning LED-THz focal spot with arrow indicating scanning path; (b) image of the focused terahertz spot measured by the commercial camera

    Fig. 3. Test results of scanning LED-THz camera. (a) Scanning LED-THz focal spot with arrow indicating scanning path; (b) image of the focused terahertz spot measured by the commercial camera

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    Terahertz camera based on LED array. (a) Current integration circuit; (b) framework; (c) front panel of LabView program; (d) photograph of hardware module

    Fig. 4. Terahertz camera based on LED array. (a) Current integration circuit; (b) framework; (c) front panel of LabView program; (d) photograph of hardware module

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    Test results of array LED- terahertz camera. (a) Terahertz focal spot captured on a commercial camera; (b) terahertz focal spot captured by array camera

    Fig. 5. Test results of array LED- terahertz camera. (a) Terahertz focal spot captured on a commercial camera; (b) terahertz focal spot captured by array camera

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    • Table 1. Partial parameters of the array LED-THz camera

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      Table 1. Partial parameters of the array LED-THz camera

      ParameterValueDescription
      THz e-field strength> 50 kV/cmThreshold value of nonlinear impact ionization effect
      Responsivity0.1 kV/W
      Spatial resolution1.78 mmDefined by the distance between two adjacent pixels
      Number of pixels648×8 array
      Integral time0.1--1 sSet by LabView program; restricted by repetition rate ofTHz pulses (10 Hz in this work)
      Data resolution20 bit /16 bitSet by LabView program
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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

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    Paper Information

    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)

    DOI:10.3788/AOS202141.2411002

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology