Cao Yue, Tang Lili, Jin Renchao, Li Jiaqi, Wang Jin, Dong Zheng-Gao
Opt Lett. 2021 Mar 1;46(5):1117-1120. doi: 10.1364/OL.415844.
The polarization of light, the vector nature of electromagnetic waves, is one of the fundamental parameters. Finding a direct and efficient method to measure the state of polarized light is extremely urgent for nano-optical applications. Based on Malus's law, we design an ultracompact metasurface composed of silver nanorods, which is demonstrated to directly measure the state of linear polarization by a grayscale image. Using an ultrathin metasurface, we generate grayscale images with gradient grayscale levels which are linked directly to the polarization state of the incident light. The direction of the linear polarization of incident light can be conveniently and efficiently obtained through extracting the angle of the brightest area of the grayscale image. The ultrathin metasurface operates in the broadband 750-1100 nm spectral range. It is a novel and significant method to analyze the linear polarization state of light, which provides opportunities for various applications, such as polarimetric multispectral imaging and miniaturized polarimeter.
光的偏振，即电磁波的矢量特性，是基本参数之一。找到一种直接且高效的方法来测量偏振光的状态对于纳米光学应用极为迫切。基于马吕斯定律，我们设计了一种由银纳米棒组成的超紧凑型超表面，通过灰度图像证明其可直接测量线偏振状态。利用超薄超表面，我们生成了具有梯度灰度级的灰度图像，这些灰度级与入射光的偏振状态直接相关。通过提取灰度图像最亮区域的角度，可以方便且高效地获得入射光的线偏振方向。该超薄超表面在750 - 1100 nm宽光谱范围内工作。这是一种分析光的线偏振状态的新颖且重要的方法，为诸如偏振多光谱成像和小型化偏振计等各种应用提供了机会。
