期刊
SCIENCE
卷 365, 期 6451, 页码 374-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax2357
关键词
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资金
- U.S. Air Force Office of Scientific Research (AFOSR) [FA9550-14-1-0389]
- AFOSR [FA9550-17-1-0002, FA9550-18-1-0002]
- Rubicon Fellowship from the Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)
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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