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Terahertz bound state in the continuum in dielectric membrane metasurfaces

Journal Article · · New Journal of Physics
 [1];  [2];  [1];  [1];  [3];  [1];  [1];  [4];  [1];  [1]
  1. Tianjin Univ. (China); Ministry of Education of China, Tianjin (China)
  2. Central South Univ., Changsha (China)
  3. Australian National Univ., Canberra, ACT (Australia)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Mie-resonant metasurfaces composed of subwavelength dielectric resonators enable an efficient route for electromagnetic wave manipulation. Among these manipulations, a localized mode with a high-quality factor coexisting with a continuous spectrum of radiating waves termed bound state in the continuum (BIC) can arouse many exotic applications in photonics. Here, we demonstrate the terahertz BIC in a dielectric membrane metasurface and analyze its resonant nature based on Mie-resonant multipoles and vector spherical harmonics. The intrinsic splitting of the resonances under oblique incidence is also explored, in which the conversion of multipole radiation patterns versus the oblique angle will drive the resonances from BIC to leaky modes or vice versa. Both Γ and off-Γ point BICs could be identified as the superposition cancellation of vector spherical harmonics for both p-wave and s-wave. Our research not only provides a novel perspective for exploring the essence of BIC metasurfaces in the terahertz regime, but also points new opportunities for achieving terahertz BIC metasurfaces with ultra-high quality factors.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Australian Research Council; National Natural Science Foundation of China; USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1866671
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 5 Vol. 24; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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