Dynamic bound states in the continuum


Journal Article

© 2019 Optical Society of America. All-dielectric metasurfaces are a versatile platform to investigate a host of unconventional physical scattering responses. Effects, including high absorption and Huygens’ surfaces, have been demonstrated; however, a more exotic materialization-termed bound states in the continuum (BSC s )-exists and consists of nonradiating localized waves that lie within the energy spectrum of the continuum. Here we experimentally demonstrate a dynamic BSC at terahertz frequencies that realizes a material-limited high-quality factor (Q) resonance Q = 8.7 × 10 3 , which may be modified by over 2 orders of magnitude through photodoping with band gap light. We elucidate the nature of the BSC resonance, and our experimental results are well supported by eigenvalue and S-parameter simulations. The demonstrated system and underlying theory establish a path to realize extremely high-Q dynamic resonances, which may be useful for detection of hazardous materials and frequency-diverse imaging.

Full Text

Duke Authors

Cited Authors

  • Fan, K; Shadrivov, IV; Padilla, WJ

Published Date

  • February 20, 2019

Published In

Volume / Issue

  • 6 / 2

Start / End Page

  • 169 - 173

International Standard Serial Number (ISSN)

  • 2334-2536

Digital Object Identifier (DOI)

  • 10.1364/OPTICA.6.000169

Citation Source

  • Scopus