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Laser & Optoelectronics Progress, Volume. 60, Issue 18, 1811010(2023)

Bound States in Continuum in Terahertz Metasurface

Jinhui Shi1,3、*, Weiyan Li1, Shun Wan1, Yiyuan Wang1, Chunhua Qin1, Zenglin Li2, Zheng Zhu1, Yuxiang Li1, and Chunying Guan1
Author Affiliations
  • 1Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Physics and Optoelectronic Engineering, Harbin Engineering University, Harbin 150001, Heilongjiang , China
  • 2Shanghai Institute of Measurement and Testing Technology, Shanghai 201109, China
  • 3National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, Heilongjiang , China
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    Figures&Tables (10)
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    References (79)
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    Figures & Tables(10)
    Optical BIC phenomenon and its research progress

    Fig. 1. Optical BIC phenomenon and its research progress

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    BIC in THz metasurface.(a) Structure of symmetric protection BIC; (b) transmission spectrum of symmetric protection BIC;(c) angular dependence of Q factor of symmetric protection BIC[18];(d) structure of F-W BIC;(e) dependence of F-W BIC resonance on the detuning frequency; (f) transmission spectra near F-W BIC[20]

    Fig. 2. BIC in THz metasurface.(a) Structure of symmetric protection BIC; (b) transmission spectrum of symmetric protection BIC;(c) angular dependence of Q factor of symmetric protection BIC[18];(d) structure of F-W BIC;(e) dependence of F-W BIC resonance on the detuning frequency; (f) transmission spectra near F-W BIC[20]

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    Influence of in-plane asymmetric alignment BIC radiation Q factor [27]. (a) Dependence of Q factor on asymmetric parameter α; (b) definition of the asymmetric parameter α for different metasurfaces

    Fig. 3. Influence of in-plane asymmetric alignment BIC radiation Q factor [27]. (a) Dependence of Q factor on asymmetric parameter α; (b) definition of the asymmetric parameter α for different metasurfaces

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    Topological properties of BIC[46]. (a) Schematic diagram of metasurface resonance radiation field decomposition;(b) node line diagram of cx and cy in k-space region near BIC; (c) two possible configurations of polarization field near BIC

    Fig. 4. Topological properties of BIC[46]. (a) Schematic diagram of metasurface resonance radiation field decomposition;(b) node line diagram of cx and cy in k-space region near BIC; (c) two possible configurations of polarization field near BIC

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    Point C and the process of merging BIC. (a) Schematic diagram of point c generated from BIC[52]; (b) merging process of BIC; (c) change of radiation loss γ of BIC during the merging process[51]

    Fig. 5. Point C and the process of merging BIC. (a) Schematic diagram of point c generated from BIC[52]; (b) merging process of BIC; (c) change of radiation loss γ of BIC during the merging process[51]

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    Quasi-BIC resonant sensing. (a) ‒(c) Quasi-BIC highly sensitive sensor based on metal structure[53]; (d) ‒(g) quasi-BIC highly sensitive sensor based on all-dielectric structure[56]

    Fig. 6. Quasi-BIC resonant sensing. (a) ‒(c) Quasi-BIC highly sensitive sensor based on metal structure[53]; (d) ‒(g) quasi-BIC highly sensitive sensor based on all-dielectric structure[56]

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    Chiral quasi-BIC. Chiral quasi-BIC supported by plasmonic resonators[63], (a) geometry of chiral quasi-BIC, (b) ‒(d) reflection spectra of chiral quasi-BIC supported by different geometries; chiral quasi-BIC supported by dielectric metasurface [64], (e) ‒(g) far-field polarization patterns of chiral quasi-BIC metasurface under different symmetry-breaking conditions, (h) magnetic field component along the z-direction, (i) CD spectrum

    Fig. 7. Chiral quasi-BIC. Chiral quasi-BIC supported by plasmonic resonators[63], (a) geometry of chiral quasi-BIC, (b) ‒(d) reflection spectra of chiral quasi-BIC supported by different geometries; chiral quasi-BIC supported by dielectric metasurface [64], (e) ‒(g) far-field polarization patterns of chiral quasi-BIC metasurface under different symmetry-breaking conditions, (h) magnetic field component along the z-direction, (i) CD spectrum

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    Fingerprint detection of quasi-BIC metasurface[74]. (a) Complex refractive index and three surface coating cases for equal volumes of trace samples; (b) ‒(e) angle-multiplexed reflectance spectra and their envelopes are provided for a bare metasurface; (f) absorbance envelopes of three cases

    Fig. 8. Fingerprint detection of quasi-BIC metasurface[74]. (a) Complex refractive index and three surface coating cases for equal volumes of trace samples; (b) ‒(e) angle-multiplexed reflectance spectra and their envelopes are provided for a bare metasurface; (f) absorbance envelopes of three cases

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    Near-field imaging with quasi BIC [76-77]. (a) Extraction of target image pixels and reconstruction process based on metasurfaces; (b) side view and top view photographs and scanning electron microscope images of the sample; (c)-(e) experimental results of terahertz near-field display at different frequencies

    Fig. 9. Near-field imaging with quasi BIC [76-77]. (a) Extraction of target image pixels and reconstruction process based on metasurfaces; (b) side view and top view photographs and scanning electron microscope images of the sample; (c)-(e) experimental results of terahertz near-field display at different frequencies

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    • Table 1. Q-factor of various BIC terahertz metasurfaces

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      Table 1. Q-factor of various BIC terahertz metasurfaces

      Reference yearStructureMaterialQ-factorReference
      2019Two asymmetric split ringsSi75.7［31］
      2021Rectangle groovesSi39587［32］
      2021NanodisksSi120［33］
      2022Perforated air hole tetramersSi1049［34］
      2021Double-slit arrayCu60.9［35］
      2021Double split ringAu41.96［36］
      2014Square configurationNb54［37］
      2012Asymmetric split ringAl227［38］
      2016Double split ringAl49［39］
      2016Two asymmetric split ringsAl42.5［40］
      2022Double-layer grapheneGraphene968［41］
      2023Monolayer grapheneGraphene340［42］
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    Jinhui Shi, Weiyan Li, Shun Wan, Yiyuan Wang, Chunhua Qin, Zenglin Li, Zheng Zhu, Yuxiang Li, Chunying Guan. Bound States in Continuum in Terahertz Metasurface[J]. Laser & Optoelectronics Progress, 2023, 60(18): 1811010

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    Paper Information

    Category: Imaging Systems

    Received: Aug. 7, 2023

    Accepted: Aug. 22, 2023

    Published Online: Sep. 20, 2023

    The Author Email: Jinhui Shi (shijinhui@hrbeu.edu.cn)

    DOI:10.3788/LOP231867

    Topics

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