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Title | Dynamic bound states in the continuum |
Publication Type | Journal Article |
Year of Publication | 2019 |
Authors | K Fan,, and WJ Padilla |
Journal | Optica |
Volume | 6 |
Issue | 2 |
Start Page | 169 |
Pagination | 169 - 173 |
Date Published | 02/2019 |
Abstract | 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. |
DOI | 10.1364/OPTICA.6.000169 |
Short Title | Optica |