基于悬链孔超表面的偏振检测器件

Polarization detection device based on catenary metasurface

传统的光学器件因体积笨重,仅对线偏振光或圆偏振光敏感等缺点,无法满足现代光学集成化的要求。基于表面等离子体激元(surface plasmon polaritons,SPPs)设计了一种由悬链孔组成的通用型偏振分析仪,推导了SPPs传播的理论,并采用时域有限差分法计算了单元悬链孔的电场模式和器件中心电场强度的分布。结果表明,当分别入射不同偏振态的光源时,悬链孔具有多种电场模式,器件中心明显差异化的电场分布可以有效地区分线偏振光、圆偏振光和矢量偏振光(径向偏振光和角向偏振光)的偏振态,该结果有助于悬链线多功能器件的研究与开发。

Traditional optical devices cannot meet the requirements of modern optical integration because of their bulky size and sensitivity to linearly polarized light or circularly polarized light.In this paper,based on surface plasmon polaritons(SPPs),a universal polarization analyzer consisting of catenary was designed.The theory of SPPs propagation was derived,and the electric field pattern of catenary and the distribution of electric field intensity in the center of the device were calculated by using the finite difference time domain method.The results show that when light of different polarization states are incident separately,catenary has a variety of electric field patterns.The significantly differentiated electric field distribution in the center of the device can effectively distinguish the polarization states of linearly polarized light,circular polarized light and vector polarized light(radial polarized light and angular polarized light).Therefore,these results are helpful for the research and development of the catenary multifunctional devices.