사이트맵

   SCIENCE Vol 365 No. 6451

『Spatiotemporal light control with frequency-gradient metasurfaces』

Authors

Amr M. Shaltout, Konstantinos G. Lagoudakis, Jorik van de Groep, Soo Jin Kim, Jelena Vučković, Vladimir M. Shalaev, Mark L. Brongersma 

Abstract

The capability of on-chip wavefront modulation has the potential to revolutionizemany optical device technologies. However, the realization of power-efficient phase-gradient metasurfaces that offer full-phase modulation (0 to 2p) and high operationspeeds remains elusive. We present an approach to continuously steer light thatis based on creating a virtual frequency-gradient metasurface by combining a passivemetasurfacewithanadvancedfrequency-comb source. Spatiotemporal redirectionof light naturally occurs asoptical phase-fronts reorient at a speed controlled by thefrequency gradient across the virtual metasurface. An experimental realization of laserbeam steering with a continuously changingsteering angle is demonstrated with asingle metasurface over an angle of 25° in just 8 picoseconds. This work can supportintegrated-on-chip solutions for spatiotemporal optical control, directly affectingemerging applications such as solid-state light detection and ranging (LIDAR), three-dimensional imaging, and augmented or virtual systems. 

Review

나노 광학 및 전자기학을 기반으로 차세대 안테나 설계 및 광소자 개발에 대한 연구