2024-07-24 カリフォルニア工科大学(Caltech)
＜関連情報＞
- https://www.caltech.edu/about/news/nanoscale-device-simultaneously-steers-and-shifts-frequency-of-optical-light-pointing-the-way-to-future-wireless-communication-channels
- https://www.nature.com/articles/s41565-024-01728-9
光周波数で電気的に調整可能な時空間メタサーフェス Electrically tunable space–time metasurfaces at optical frequencies
Jared Sisler,Prachi Thureja,Meir Y. Grajower,Ruzan Sokhoyan,Ivy Huang & Harry A. Atwater
Nature Nanotechnology Published:24 July 2024
DOI:https://doi.org/10.1038/s41565-024-01728-9
Abstract
Active metasurfaces enable dynamic manipulation of the scattered electromagnetic wavefront by spatially varying the phase and amplitude across arrays of subwavelength scatterers, imparting momentum to outgoing light. Similarly, periodic temporal modulation of active metasurfaces allows for manipulation of the output frequency of light. Here we combine spatial and temporal modulation in electrically modulated reflective metasurfaces operating at 1,530 nm to generate and diffract a spectrum of sidebands at megahertz frequencies. Temporal modulation with tailored waveforms enables the design of a spectrum of sidebands. By impressing a spatial phase gradient on the metasurface, we can diffract selected combinations of sideband frequencies. Combining active temporal and spatial variation can enable unique optical functions, such as frequency mixing, harmonic beam steering or shaping, and breaking of Lorentz reciprocity.
