• Chinese Optics Letters
  • Vol. 22, Issue 6, 061202 (2024)
Qiao Sun1,2,3, Nianxi Xu1,2, Haigui Yang1,2,3, Dongzhi Shan1,2..., Yang Tang1,2, Xin Chen1,2, Tongtong Wang1,2,*, Jinsong Gao4 and Yu Cai5|Show fewer author(s)
Author Affiliations
  • 1Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
  • 2State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
  • 4Jilin Provincial Key Laboratory of Advanced Optoelectronic Equipment and Instrument Manufacturing Technology, Changchun 130033, China
  • 5Unit 96951 of the People’s Liberation Army, Beijing 100039, China
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    DOI: 10.3788/COL202422.061202 Cite this Article Set citation alerts
    Qiao Sun, Nianxi Xu, Haigui Yang, Dongzhi Shan, Yang Tang, Xin Chen, Tongtong Wang, Jinsong Gao, Yu Cai, "Highly efficient optics/microwave beam splitter based on frequency selective surface," Chin. Opt. Lett. 22, 061202 (2024) Copy Citation Text show less

    Abstract

    The development of hybrid optics/microwave communication systems puts forward a new requirement for beam splitters to efficiently transmit microwave signals and simultaneously reflect optical signals. Owing to mechanical constraints, the physical thickness of beam splitters is of the order of tens of millimeters. The corresponding electrical thickness has the same order of magnitude as microwave wavelengths, and the resulting multi-beam interference effect significantly reduces the microwave transmittance, impacting the beam splitting quality. This study presents a new optics/microwave beam splitter based on the ability of the frequency selective surface (FSS) to shape the resonant curve. A beam splitter sample, whose physical thickness and substrate material are 20 mm and quartz glass, respectively, is designed, simulated, fabricated, and characterized to validate the feasibility of this strategy. The measured results show that the minimum microwave transmittance between 35 and 36.5 GHz with an incidence angle of 45° under TE polarization is 86.43%, and the mean value of the reflectance spectra from 450 to 900 nm and that from 7.7 to 10.5 μm both exceed 96%. This FSS-based optics/microwave beam splitter is expected to play a key role in hybrid optics/microwave communication systems.
    2nhcosφ=mλ,m=0,1,2,,

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    2nhcosφ=mcf,Δf=c2nhcosφ.

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    MTL=(cosθjZ1sinθjZ1sinθcosθ),

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    Mtotal=MTLαMbondMTLβ=(cosθαjZ1sinθαjZ1sinθαcosθα)(cosθ2jZ1sinθ2jZ2sinθ2cosθ2)·(cosθβjZ1sinθβjZ1sinθβcosθβ).

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    Mtotal(cosθ1jZ1sinθ1jZ1sinθcosθ1).

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    MY=(10Y1),

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    Mt=MTLαMYMTLβ=(cosθ1+12jZ1Ysinθ1jZ1sinθ1YZ121cosθ12jZ1sinθ1+Y1+cosθ12cosθ1+12jZ1Ysinθ1).

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    S12=S21=2j(Z1Y+Z1ZC+ZCZ1)sinθ1+[Y2(Z12ZC+ZC)+2]cosθ+1Y2(ZCZ12ZC).

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    Mopticalfilm=(cosθjZ1sinθjZ1sinθcosθ)(1001).

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    Qiao Sun, Nianxi Xu, Haigui Yang, Dongzhi Shan, Yang Tang, Xin Chen, Tongtong Wang, Jinsong Gao, Yu Cai, "Highly efficient optics/microwave beam splitter based on frequency selective surface," Chin. Opt. Lett. 22, 061202 (2024)
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