• Chinese Journal of Lasers
  • Vol. 50, Issue 2, 0214001 (2023)
Xingyuan Zhang, Jianqiang Gu*, and Wenqiao Shi
Author Affiliations
  • Key Laboratory of Optoelectronic Information Technology, Ministry of Education, School of Precision Instrument and Opto-Electronics Engineering, Center for Terahertz Waves, Tianjin University, Tianjin 300072, China
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    DOI: 10.3788/CJL202350.0214001 Cite this Article Set citation alerts
    Xingyuan Zhang, Jianqiang Gu, Wenqiao Shi. Terahertz Metasurface with Bound States in Continuum Based on Metal Split Ring Resonator[J]. Chinese Journal of Lasers, 2023, 50(2): 0214001 Copy Citation Text show less
    Diagrams of SRR structure and BIC field distribution. (a) Diagram of SRR dimension; (b) Distribution of x component of BIC electric field in superlattice ①; (c) distribution of x component of BIC electric field distribution in superlattice ②; (d) field mode distribution near SRR in BIC; (e) diagram of designed structure
    Fig. 1. Diagrams of SRR structure and BIC field distribution. (a) Diagram of SRR dimension; (b) Distribution of x component of BIC electric field in superlattice ①; (c) distribution of x component of BIC electric field distribution in superlattice ②; (d) field mode distribution near SRR in BIC; (e) diagram of designed structure
    Diagrams of QBIC under different structural asymmetric degrees. Schematics of superlattices (a) ① and (b) ② after breaking structural symmetry; transmission spectra for superlattices (c) ① and (d) ② under different δg ; color maps of transmission spectra corresponding to (e) BIC I and (f) BIC II under different asymmetric degrees
    Fig. 2. Diagrams of QBIC under different structural asymmetric degrees. Schematics of superlattices (a) ① and (b) ② after breaking structural symmetry; transmission spectra for superlattices (c) ① and (d) ② under different δg ; color maps of transmission spectra corresponding to (e) BIC I and (f) BIC II under different asymmetric degrees
    Diagrams of resonance field distributions in asymmetric structures and relationship between Q and asymmetric degree. (a) Distributions of x components of electric fields for different resonances;(b) transmission spectrum of superlattice ① when δg= 4 μm; (c) relationship between Q and asymmetric degree
    Fig. 3. Diagrams of resonance field distributions in asymmetric structures and relationship between Q and asymmetric degree. (a) Distributions of x components of electric fields for different resonances;(b) transmission spectrum of superlattice ① when δg= 4 μm; (c) relationship between Q and asymmetric degree
    Electric field distributions of BICs in superlattice ③ and transmission spectra in asymmetric structure. (a) Electric field distribution of BIC at 0.380 THz; (b) electric field distribution of BIC at 0.425 THz; (c) diagram of superlattice ③ after breaking structural symmetry; (d) transmission spectra after breaking structural symmetry; (e) color map of transmission spectra
    Fig. 4. Electric field distributions of BICs in superlattice ③ and transmission spectra in asymmetric structure. (a) Electric field distribution of BIC at 0.380 THz; (b) electric field distribution of BIC at 0.425 THz; (c) diagram of superlattice ③ after breaking structural symmetry; (d) transmission spectra after breaking structural symmetry; (e) color map of transmission spectra
    Relationship between QBIC and ohmic loss of metal materials. (a) Transmission spectra of superlattices ① composed of different metals; (b) conductivity of metal materials calculated by Drude model
    Fig. 5. Relationship between QBIC and ohmic loss of metal materials. (a) Transmission spectra of superlattices ① composed of different metals; (b) conductivity of metal materials calculated by Drude model
    Relationship between BIC / QBIC and incident angle. (a) Diagram of incident angle; (b) Q of QBIC versus incident angle; (c)-(f)variation of transmission spectrum of superlattice ① with incident angle
    Fig. 6. Relationship between BIC / QBIC and incident angle. (a) Diagram of incident angle; (b) Q of QBIC versus incident angle; (c)-(f)variation of transmission spectrum of superlattice ① with incident angle
    Variation of transmission spectrum of superlattice ② with incident angle
    Fig. 7. Variation of transmission spectrum of superlattice ② with incident angle
    Xingyuan Zhang, Jianqiang Gu, Wenqiao Shi. Terahertz Metasurface with Bound States in Continuum Based on Metal Split Ring Resonator[J]. Chinese Journal of Lasers, 2023, 50(2): 0214001
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