Volume 14 Issue 4
Jul.  2021
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LI Xiang-jun, HOU Xiao-mei, CHENG Gang, QIU Guo-hua, YAN De-xian, LI Jiu-sheng. Simulation on tunable graphene metasurface focusing mirror based on flexible substrate[J]. Chinese Optics, 2021, 14(4): 1019-1028. doi: 10.37188/CO.2020-0171
Citation: LI Xiang-jun, HOU Xiao-mei, CHENG Gang, QIU Guo-hua, YAN De-xian, LI Jiu-sheng. Simulation on tunable graphene metasurface focusing mirror based on flexible substrate[J]. Chinese Optics, 2021, 14(4): 1019-1028. doi: 10.37188/CO.2020-0171

Simulation on tunable graphene metasurface focusing mirror based on flexible substrate

doi: 10.37188/CO.2020-0171
Funds:  Supported by the National Natural Science Foundation of China (No. 62001444, No. 61871355, No. 61831012); Natural Science Foundation of Zhejiang Province (No. LQ20F010009, No. LY18F010016); Basic Public Welfare Research Project of Zhejiang Province (No. LGF19F010003)
More Information
  • Corresponding author: yandexian1991@cjlu.edu.cn
  • Received Date: 25 Sep 2020
  • Rev Recd Date: 13 Oct 2020
  • Available Online: 25 Jan 2021
  • Publish Date: 01 Jul 2021
  • Ultra-thin focusing mirror with adjustable focal length has important applications in compact systems, especially for on-chip terahertz spectroscopy, imaging systems and communication systems. By changing the geometric size and adjusting the chemical potential, the graphene subwavelength reflective structure can achieve a phase of 0~2π. Combined with the above properties and the dynamic stretching of polydimethylsiloxane (PDMS) flexible substrate, the ultra-thin terahertz focusing reflector with large dynamic adjustment range can be realized. In this paper, a dynamic focusing graphene metasurface focusing reflector based on flexible substrate with a working frequency of 1.0 THz, a width of 12 mm, a focal length of 60 mm and a thickness of 75 μm is designed and investigated. Firstly, by adjusting the chemical potential and width of the graphene unit strips, the reflective phase covers the 0~2π, and the reflective focusing effect can be achieved according to the predesigned phase spatial distribution. Then, the dynamic adjustment of the focal length of the reflective mirror can be realized by laterally stretching the flexible substrate. The simulation results demonstrate that when the length of the flexible substrate varies from 100% to 140%, the focal length of the reflective mirror increases from 53.4 mm to 112.1 mm, the dynamic focus range can reach 109.7% of the minimum focal length, and the focus efficiency decreases from 69.7% to 46.8%. In addition, the performance of the reflective mirror in a wide frequency range has also been investigated, and the simulation results demonstrate that the good dynamic focusing for incident plane waves in the frequency range of 0.85~1.0 THz can be achieved. The proposed tunable metasurface design is highly versatile in the development of ultra-thin, multifunctional and tunable terahertz devices for various applications.


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