论文部分内容阅读
金属线栅偏振器是一种新兴的基于微纳结构的光学偏振器件,体积小、性能高、易集成.但在紫外和可见光波段,通过缩小线栅的特征尺寸来提高消光比的方法已经受到纳米制作工艺的限制,因此需要新的结构来提高其偏振特性.双层金属线栅结构仅在特定波段上提高器件的偏振特性.在此基础上,提出一种间距可调谐的金属线栅偏振器结构,通过调谐两层金属线栅之间的距离来确保偏振器极高的消光比和很强的透过率.利用VirtualLab软件的傅里叶模式方法,计算了可调谐型金属线栅偏振的透过率和消光比.数值仿真结果表明,双层可调谐型金属线栅结构在整个紫外、可见光波段极大地提高了透射光的消光比和透过率.
Wire grid polarizer is an emerging optical polarization device based on the micro-nano structure, which has the advantages of small volume, high performance and easy integration. However, the method of increasing the extinction ratio by reducing the feature size of the wire grid in the ultraviolet and visible light bands has been Therefore, a new structure is needed to improve the polarization characteristics of the fabricated nanowires.The double-layer metal grid structure enhances the polarization characteristics of the device only in a specific wavelength range.On the basis of this, Device structure to ensure high extinction ratio and high transmittance of the polarizer by tuning the distance between the two metal wire grids.Through the Fourier mode method of VirtualLab software, the tunable metal wire grid polarization Transmittance and extinction ratio.The numerical simulation results show that the double-layer tunable metal wire grid structure greatly improves the extinction ratio and transmittance of transmitted light in the whole UV and visible light band.