Active nonlocal metasurfaces
| Autor: | Stephanie C. Malek, Sajan Shrestha, Nanfang Yu, Adam C. Overvig |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
QC1-999
quasi-bound states in the continuum FOS: Physical sciences Physics::Optics Applied Physics (physics.app-ph) 02 engineering and technology 01 natural sciences Mechanical stretching Narrow bandwidth Optics 0103 physical sciences Electrical and Electronic Engineering 010306 general physics Physics Wavefront business.industry nonlocal Fano resonance Physics - Applied Physics 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials metasurface Nanolithography Optical modulator Modulation optical modulator 0210 nano-technology business Refractive index Optics (physics.optics) Physics - Optics Biotechnology |
| Zdroj: | Nanophotonics, Vol 10, Iss 1, Pp 655-665 (2020) |
| ISSN: | 2192-8614 2192-8606 |
| DOI: | 10.1515/nanoph-2020-0375 |
| Popis: | Actively tunable and reconfigurable wavefront shaping by optical metasurfaces poses a significant technical challenge often requiring unconventional materials engineering and nanofabrication. Most wavefront-shaping metasurfaces can be considered 'local' in that their operation depends on the responses of individual meta-units. In contrast, 'nonlocal' metasurfaces function based on the modes supported by many adjacent meta-units, resulting in sharp spectral features but typically no spatial control of the outgoing wavefront. Recently, nonlocal metasurfaces based on quasi-bound states in the continuum have been shown to produce designer wavefronts only across the narrow bandwidth of the supported Fano resonance. Here, we leverage the enhanced light-matter interactions associated with sharp Fano resonances to explore the active modulation of optical spectra and wavefronts by refractive index tuning and mechanical stretching. We experimentally demonstrate proof-of-principle thermo-optically tuned nonlocal metasurfaces made of silicon, and numerically demonstrate nonlocal metasurfaces that thermo-optically switch between distinct wavefront shapes. This meta-optics platform for thermally reconfigurable wavefront-shaping requires neither unusual materials and fabrication nor active control of individual meta-units. 15 pages, 6 figures |
| Databáze: | OpenAIRE |
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