Metasurfaces

A metasurface performance enhancer

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Science  09 Apr 2021:
Vol. 372, Issue 6538, pp. 142-143
DOI: 10.1126/science.372.6538.142-d

The detection and emission of light plays a key role in applications such as free-space communications, biosensing, and optical imaging. Fluorescent dye molecules or nanoparticles in a cavity are typically used for photodetection but can be limited in sensitivity and efficiency. Traverso et al. fabricated a low-loss plasmonic metasurface made from silver nanocubes scattered across the surface of the cavity. Modification of the local optical density of states results in a device that can collect fast-modulated light (>14 gigahertz) with a high acceptance angle (120°) and convert it to a directional source with enhanced overall efficiency (>30%). The approach could be incorporated into the design of other ultrafast optoelectronic components to enhance performance.

Optica 8, 202 (2021).

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