Thureja Prachi, Sokhoyan Ruzan, Hail Claudio U, Sisler Jared, Foley Morgan, Grajower Meir Y, Atwater Harry A
Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Pasadena, CA 91125, USA.
Nanophotonics. 2022 Aug 22;11(17):3745-3768. doi: 10.1515/nanoph-2022-0155. eCollection 2022 Sep.
In recent years, active metasurfaces have emerged as a reconfigurable nanophotonic platform for the manipulation of light. Here, application of an external stimulus to resonant subwavelength scatterers enables dynamic control over the wavefront of reflected or transmitted light. In principle, active metasurfaces are capable of controlling key characteristic properties of an electromagnetic wave, such as its amplitude, phase, polarization, spectrum, and momentum. A 'universal' active metasurface should be able to provide independent and continuous control over all characteristic properties of light for deterministic wavefront shaping. In this article, we discuss strategies for the realization of this goal. Specifically, we describe approaches for high performance active metasurfaces, examine pathways for achieving two-dimensional control architectures, and discuss operating configurations for optical imaging, communication, and computation applications based on a universal active metasurface.
近年来，有源超表面已成为一种用于光操纵的可重构纳米光子平台。在此，对共振亚波长散射体施加外部刺激能够对反射或透射光的波前进行动态控制。原则上，有源超表面能够控制电磁波的关键特性，如振幅、相位、偏振、光谱和动量。一个“通用”的有源超表面应该能够对光的所有特性提供独立且连续的控制，以实现确定性的波前整形。在本文中，我们讨论实现这一目标的策略。具体而言，我们描述了高性能有源超表面的方法，研究了实现二维控制架构的途径，并讨论了基于通用有源超表面的光学成像、通信和计算应用的操作配置。
