中国激光, 2020, 47 (3): 0301005, 网络出版: 2020-03-12
深紫外光栅反常偏振器件的设计与分析 下载: 1119次
Design and Analysis of Inverse Polarization Grating Devices for Deep Ultraviolet Light
激光光学 深紫外波段 共振域光栅 反常偏振效应 光栅偏振器件 偏振性能 laser optics deep ultraviolet band resonant-domain grating inverse polarizing effect grating polarizer polarization performance
摘要
为实现金属光栅偏振器件在光刻机偏振照明系统中的应用,基于共振域光栅的反常偏振效应,提出一种以二氧化硅为基底、铝与氟化镁作为栅线材料的介质-金属光栅偏振器。与传统的亚波长金属光栅偏振器相比,该偏振器的光栅周期接近入射波长(0.19~0.20 μm),表现出透射TE偏振光、反射TM偏振光的反常特性。由时域有限差分算法(FDTD)的数值模拟结果可得,当波长为0.193 μm的光垂直入射时,该光栅偏振器对TE偏振光的透过率大于60%,偏振消光比大于180。与具有相同结构参数和栅线材料的单层金属光栅偏振器相比,该介质-金属光栅偏振器在深紫外波段具有良好的偏振性能,TE偏振光透过率提升了约10%,偏振消光比提升了4.5倍左右(在0.193 μm波长下)。
Abstract
To realize the application of a metal grating polarizer in a polarization illumination system for photolithography, a dielectric-metal grating polarizer based on the inverse polarization effect of a resonant-domain grating is proposed. The grating comprises aluminum (Al), magnesium fluoride (MgF2), and a silicon dioxide (SiO2) substrate. In comparison with general sub-wavelength metallic gratings, the period of the proposed polarizer is close to the wavelength of the incident light (0.19--0.20 μm), and it exhibits the inverse polarization effect of transmitting transverse electric (TE) polarized light and reflecting transverse magnetic (TM) polarized light. Finite difference time domain (FDTD) simulation results indicate that the transmittance of TE-polarized light exceeds 60% and the polarization extinction ratio is greater than 180 when light having a wavelength of 0.193 μm is incident normally. In comparison with a single-layer metal grating polarizer constructed using the same materials and structural parameters, the proposed dielectric-metal grating polarizer exhibits better polarization performance in the deep ultraviolet band, with the transmittance and extinction ratio approximately increased by 10% and 4.5 times at wavelength of 0.193 μm, respectively.
张冲, 胡敬佩, 周如意, 刘铁诚, SergeyAvakaw, 曾爱军, 黄惠杰. 深紫外光栅反常偏振器件的设计与分析[J]. 中国激光, 2020, 47(3): 0301005. Zhang Chong, Hu Jingpei, Zhou Ruyi, Liu Tiecheng, Sergey Avakaw, Zeng Aijun, Huang Huijie. Design and Analysis of Inverse Polarization Grating Devices for Deep Ultraviolet Light[J]. Chinese Journal of Lasers, 2020, 47(3): 0301005.