Leaky-wave metasurfaces for integrated photonics
Leaky-wave metasurfaces for integrated photonics
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DOI：
10.1038/s41565-023-01360-z
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发表时间：
2023-05-08
影响因子：
38.3
通讯作者：
Yu, Nanfang
中科院分区：
文献类型：
--
作者：
Huang, Heqing;Overvig, Adam C.;Yu, Nanfang
基于破密微扰原理的漏波超颖表面（Leaky-wave metasurfaces）是一种对表面发射的振幅、相位和偏振进行逐点控制的超颖表面，它为集成光子学提供了一种通用的光栅耦合器。超颖表面在光的多个自由度上取得了快速的进展，但迄今为止，它们大多局限于自由空间中的光操纵。集成在导波光子系统顶部的超表面已经被探索用于控制具有增强功能的芯片外光的散射，即，逐点操纵振幅、相位或偏振。然而，迄今为止，这些努力最多限于控制一个或两个光学自由度，以及与传统光栅耦合器相比复杂得多的器件配置。在这里，我们介绍了漏波超颖表面，这是基于支持准束缚态的连续介质中的光子晶体板的破缺。该平台具有与光栅耦合器相当的紧凑形状因子，但它提供了对大孔径上的振幅、相位和偏振（四个光学自由度）的完全控制。我们提出了在一个固定的偏振态的相位和振幅控制的设备，和设备控制所有的四个光学自由度的操作在1.55 μ m的波长。通过连续体中准束缚态的混合性质合并引导和自由空间光学领域，我们的漏波元表面可能会在成像，通信，增强现实，量子光学，激光雷达和集成光子系统中找到应用。
Based on symmetry-breaking perturbations, leaky-wave metasurfaces with pointwise control of the amplitude, phase and polarization of surface emission offer a universal generalization of grating couplers for integrated photonics.Metasurfaces have been rapidly advancing our command over the many degrees of freedom of light; however, so far, they have been mostly limited to manipulating light in free space. Metasurfaces integrated on top of guided-wave photonic systems have been explored to control the scattering of light off-chip with enhanced functionalities-namely, the point-by-point manipulation of amplitude, phase or polarization. However, these efforts have so far been limited to controlling one or two optical degrees of freedom at best, as well as device configurations much more complex compared with conventional grating couplers. Here we introduce leaky-wave metasurfaces, which are based on symmetry-broken photonic crystal slabs that support quasi-bound states in the continuum. This platform has a compact form factor equivalent to the one of grating couplers, but it provides full command over the amplitude, phase and polarization (four optical degrees of freedom) across large apertures. We present devices for phase and amplitude control at a fixed polarization state, and devices controlling all the four optical degrees of freedom for operation at a wavelength of 1.55 mu m. Merging the fields of guided and free-space optics through the hybrid nature of quasi-bound states in the continuum, our leaky-wave metasurfaces may find applications in imaging, communications, augmented reality, quantum optics, LIDAR and integrated photonic systems.