基于导模共振效应三基色窄带滤光片的研究  

Guided-Mode Resonance Filter with Narrow Waveband for Three Primary Colors

作　　者：孔伟金[1] 郑併斌[1] 云茂金[1] 匡杰[1] 王书浩[1] 许家锋[1] 

机构地区：[1]青岛大学物理科学学院,山东青岛266071

出　　处：《光学学报》2011年第10期49-52,共4页Acta Optica Sinica

基　　金：国家自然科学基金(10804060;10904080)资助课题

摘　　要：为获得性能优良的三基色窄带滤光片,提出了一种基于减反射薄膜波导光栅结构的导模共振滤光片。该滤光片由亚波长光栅结构、波导层和基底组成。采用严格耦合波理论分析了亚波长光栅结构和波导层厚度对导模共振滤光片反射光谱性能的影响。数值分析表明λ/4-λ/2-λ/4结构能有效提高导模共振滤光片的性能。当光栅结构位于基底侧时,红绿蓝三基色滤光片旁通带截止带宽分别为447,349和279nm,反射率均优于95%,反射带均小于0.2nm。设计的三基色滤光片具有良好的窄带反射特性,在彩色合成与调制中有应用前景。A guided-mode resonant filter（GMRF） based on the structure of anti-reflection（AR） thin film waveguide is proposed to realize three-primary-color filter with narrow-band.The proposed grating consists of three parts： a sub-wave grating,a waveguide and a substrate.The effects of sub-wave grating and thickness of waveguide on the GMRF reflection spectrum are investigated in detail with the method of rigorous coupled-wave analysis（RCWA）.Simulation results show that the structure of λ/4-λ/2-λ/4 can improve the performance of GRMF effectively.When the grating layer is located near the substrate,the cut-off band of the optimized filter for red,green and blue primary colors are 447,349 and 279 nm,respectively.The reflectance is above 95% and reflection bands are all narrower than 0.2 nm.The optimized GMRF shows excellent performance with narrow band and can be useful for color synthesis and modulation.

关 键 词：衍射 导模共振 三基色 亚波长光栅 

分 类 号：O436.1[机械工程—光学工程]