Frequency-selective THz reflectors based on nonuniform silicon gratings
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Affiliation:

School of Science, Minzu University of China, Beijing 100081, China

Clc Number:

O433.

Fund Project:

National Natural Science Foundation of China 11574408;the National Key R&D Program of China 2017YFB0405400;The Young-talent Plan of State Affairs Commission 2016-3-02;the Undergraduate Innoviative Test Program funded by Minzu University of China URTP2019110002Supported by National Natural Science Foundation of China(11574408),the National Key R&D Program of China(2017YFB0405400), The Young-talent Plan of State Affairs Commission(2016-3-02),the Undergraduate Innoviative Test Program funded by Minzu University of China(URTP2019110002).

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    Abstract:

    As a special periodic structure, sub wavelength gratings have made important progress in filters, reflectors, couplers, sensors and so on. Among them, the non-uniform grating has a great degree of design freedom, which enables it to have the characteristics of wide bandwidth and high reflectivity in terahertz range. Moreover, different grating constants and filling factors will lead to high selectivity in frequency spectrum, thus achieving tunable reflectors. In this paper, a non-uniform, silicon-based grating was designed and fabricated, and its reflection characteristics were measured by terahertz time-domain spectroscopy in reflection mode and calculated by finite element method. The results show that the non-uniform, high-selectivity, silicon-based grating not only has the advantages of wide frequency band and high reflectivity, but also has the characteristics of simple structure, small size, easy fabrication and large process tolerance.

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ZHANG Teng, WANG Li-Yan, WANG Xin-Yuan, CUI Bin, YANG Yu-Ping. Frequency-selective THz reflectors based on nonuniform silicon gratings[J]. Journal of Infrared and Millimeter Waves,2019,38(6):733~738

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History
  • Received:February 26,2019
  • Revised:November 19,2019
  • Adopted:August 22,2019
  • Online: December 17,2019
  • Published: