Spatiotemporal light control with frequency-gradient metasurfaces
- Authors
- Shaltout, Amr M.; Lagoudakis, Konstantinos G.; van de Groep, Jorik; Kim, Soo Jin; Vuckovic, Jelena; Shalaev, Vladimir M.; Brongersma, Mark L.
- Issue Date
- 26-7월-2019
- Publisher
- AMER ASSOC ADVANCEMENT SCIENCE
- Citation
- SCIENCE, v.365, no.6451, pp.374 - +
- Indexed
- SCIE
SCOPUS
- Journal Title
- SCIENCE
- Volume
- 365
- Number
- 6451
- Start Page
- 374
- End Page
- +
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/64057
- DOI
- 10.1126/science.aax2357
- ISSN
- 0036-8075
- Abstract
- The capability of on-chip wavefront modulation has the potential to revolutionize many optical device technologies. However, the realization of power-efficient phase-gradient metasurfaces that offer full-phase modulation (0 to 2 pi) and high operation speeds remains elusive. We present an approach to continuously steer light that is based on creating a virtual frequency-gradient metasurface by combining a passive metasurface with an advanced frequency-comb source. Spatiotemporal redirection of light naturally occurs as optical phase-fronts reorient at a speed controlled by the frequency gradient across the virtual metasurface. An experimental realization of laser beam steering with a continuously changing steering angle is demonstrated with a single metasurface over an angle of 25 degrees in just 8 picoseconds. This work can support integrated-on-chip solutions for spatiotemporal optical control, directly affecting emerging applications such as solid-state light detection and ranging (LIDAR), three-dimensional imaging, and augmented or virtual systems.
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Collections - College of Engineering > School of Electrical Engineering > 1. Journal Articles
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