Volume 13 Issue 3
Jun.  2020
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Chinese Optics  > 2020  >  13(3): 605-615.
YANG Qiu-jie, HE Zhi-ping, MI Zhong-liang. Diffraction characteristics analysis of multi-depth phase modulation grating in terahertz band[J]. Chinese Optics, 2020, 13(3): 605-615. doi: 10.3788/CO.2019-0147
Citation: YANG Qiu-jie, HE Zhi-ping, MI Zhong-liang. Diffraction characteristics analysis of multi-depth phase modulation grating in terahertz band[J]. Chinese Optics, 2020, 13(3): 605-615. doi: 10.3788/CO.2019-0147
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Diffraction characteristics analysis of multi-depth phase modulation grating in terahertz band

  • 1.

    Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

  • 2.

    University of Chinese Academy of Sciences, Beijing 100049, China

  • 3.

    Shanghai Key Laboratory of Crime Scene Evidence, Shanghai 200000, China

Funds:  Supported by the National Natural Science Foundation of China (No. 61905268); Natural Science Foundation of Shanghai Province (No. 18ZR1445500); the Innovation Project Fund of Shanghai Institute of Technical Physics (IPFSITP) (No. CX-158); the Opening Project of Shanghai Key Laboratory of Crime Scene Evidence (No. 2018XCWZK14)
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  • Author Bio:

    Yang Qiujie (1988—), male, born in Gongyi City, Henan province. Ph.D. He is now an assistant researcher at Shanghai Institute of Technical Physics, and mainly engaged in THz spectral imaging research. E-mail: yqj488112gxx@163.com

    He Zhiping (1977—), male, born in Xinyu City, Jiangxi Province. Ph.D. He is now a researcher and doctoral supervisor of Shanghai Institute of Technical Physics. He is mainly engaged in the research of photoelectric detection and imaging, focusing on the spectral imaging detection technology oriented to lunar and deep space exploration applications and the spaceborne active and passive composite optical technology. E-mail: hzping@mail.sitp.ac.cn

  • Corresponding author: hzping@mail.sitp.ac.cn
  • Received Date: 10 Jul 2019
  • Rev Recd Date: 10 Aug 2019
  • Publish Date: 01 Jun 2020
    Abstract
  • To meet the requirements of terahertz spectral imaging for wide spectral range, high efficiency and real-time detection of spectrometers, a Multi-depth Phase Modulation Grating (MPMG) in terahertz band is proposed. The phase modulation of incident light is realized by introducing optical path difference resulted from the change of groove depth, so that different regions of reflecting terahertz wave front have different phase information. Based on the analysis of the intensity distribution of the diffraction field of the MPMG, the influence of grating parameters on the distribution of the diffraction field is discussed. The diffraction characteristics of the MPMG are verified by experiments. The experiment results indicate that the measurements of the 0th- and ±1st-order diffraction efficiency at 0.5 and 0.34 THz obtained by experiment and simulation are in good agreement. It suggests that 0th order diffraction of the MPMG has the ability of splitting light.

     

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