Broken Symmetry Dielectric Resonators for High Quality Factor Fano Metasurfaces
By S. Campione, Sheng Liu, L. Basilio, L. Warne, W. Langston, T. Luk, J. Wendt, J. Reno, G. Keeler, I. Brener and 1 more. 2016
315 citations recorded by the source corpus.
We present a new approach to dielectric metasurface design that relies on a single resonator per unit cell and produces robust, high quality factor Fano resonances. Our approach utilizes symmetry breaking of highly symmetric resonator geometries, such as cubes, to induce couplings between the otherwise orthogonal resonator modes. In particular, we design perturbations that couple “bright” dipole modes to “dark” dipole modes whose radiative decay is suppressed by local field effects in the array. Our approach is widely scalable from the near-infrared to radio frequencies. We first unravel the Fano resonance behavior through numerical simulations of a germanium resonator-based metasurface that achieves a quality factor of ∼1300 at ∼10.8 μm. Then, we present two experimental demonstrations operating in the near-infrared (∼1 μm): a silicon-based implementation that achieves a quality factor of ∼350; and a gallium arsenide-based structure that achieves a quality factor of ∼600, the highest near-infrared qualit...
Subfields: Aerospace Engineering, Biomedical Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/1c4801aa664e10966037b5bf27b7997262fddeca
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Citations in the corpus
- Asymmetric Metasurfaces with High-Q Resonances Governed by Bound States in the Continuum. (2018, background): “1(c)], broken-symmetry Fano metasurfaces for enhanced nonlinear effects [9, 10] [see Fig.”
- All-dielectric nanophotonics: the quest for better materials and fabrication techniques (2017, unknown): “demonstrating a Q factor of 350 (for the Si-based structure) and 600 (for the GaAs-based structure) in the near-IR (1 μm) [81].”