Document Type
Article
Publication Date
12-1-2020
Publication Source
Communications Physics
Abstract
Bound states in the continuum (BICs) are widely studied for their ability to confine light, produce sharp resonances for sensing applications and serve as avenues for lasing action with topological characteristics. Primarily, the formation of BICs in periodic photonic band gap structures are driven by symmetry incompatibility; structural manipulation or variation of incidence angle from incoming light. In this work, we report two modalities for driving the formation of BICs in terahertz metasurfaces. At normal incidence, we experimentally confirm polarization driven symmetry-protected BICs by the variation of the linear polarization state of light. In addition, we demonstrate through strong coupling of two radiative modes the formation of capacitively-driven Freidrich-Wintgen BICs, exotic modes which occur in off-Γ points not accessible by symmetry-protected BICs. The capacitance-mediated strong coupling at 0° polarization is verified to have a normalized coupling strength ratio of 4.17% obtained by the Jaynes-Cummings model. Furthermore, when the polarization angle is varied from 0° to 90° (0° ≤ ϕ < 90°), the Freidrich-Wintgen BIC is modulated until it is completely switched off at 90°.
ISBN/ISSN
2399-3650
Document Version
Published Version
Publisher
Springer Nature
Volume
3
Issue
1
Sponsoring Agency
National Science Foundation, 1541959
eCommons Citation
Kyaw, Chan; Yahiaoui, Riad; Burrow, Joshua A.; Tran, Viet; Keelen, Kyron; Sims, Wesley; Red, Eddie C.; Rockward, Willie S.; Thomas, Mikkel A.; Sarangan, Andrew M.; Agha, Imad; and Searles, Thomas A., "Polarization-selective modulation of supercavity resonances originating from bound states in the continuum" (2020). Electro-Optics and Photonics Faculty Publications. 127.
https://ecommons.udayton.edu/eop_fac_pub/127
Comments
Document is provided in compliance with the publisher's open-access policy. Permisson documentation is on file.
DOI: https://doi.org/10.1038/s42005-020-00453-8