用于面内偏振测量的波导元耦合器
Waveguide metacouplers for in-plane polarimetry
摘要：
偏振态（SOP）是光的矢量性质的固有特性，也是遥感应用中的一个重要参数。然而，SOP在实验上探测起来相当麻烦，因为常规检测器仅对光的强度做出响应，因此丢失了正交矢量分量之间的相位信息。在这项工作中，我们提出了一种新型的偏振计，是紧凑的，非常适合于在平面内的光学电路，同时允许通过同时检索相关的斯托克斯参数的SOP立即确定。偏振计基于等离子体相位梯度双折射超表面，其促进法向入射光发射在六个预定义方向上传播的平面内光子波导模式，其中耦合效率提供入射SOP的直接测量。偏振计的功能和精度，这基本上是一个全偏振敏感波导元耦合器，确认通过全波模拟在1.55 $μ$ m的工作波长。
英文摘要：
The state of polarization (SOP) is an inherent property of the vectorial nature of light and a crucial parameter in a wide range of remote sensing applications. Nevertheless, the SOP is rather cumbersome to probe experimentally, as conventional detectors only respond to the intensity of the light, hence loosing the phase information between orthogonal vector components. In this work, we propose a new type of polarimeter that is compact and well-suited for in-plane optical circuitry, while allowing for immediate determination of the SOP through simultaneous retrieval of the associated Stokes parameters. The polarimeter is based on plasmonic phase-gradient birefringent metasurfaces that facilitate normal incident light to launch in-plane photonic waveguide modes propagating in six predefined directions with the coupling efficiencies providing a direct measure of the incident SOP. The functionality and accuracy of the polarimeter, which essentially is an all-polarization sensitive waveguide metacoupler, is confirmed through full-wave simulations at the operation wavelength of 1.55$μ$m.
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