Simplified mode analysis of guided mode resonance gratings with asymmetric coatings  

作　　者：吴俊 周常河 曹红超 胡安铎 孙文婷 贾伟 

机构地区：[1]Laboratory of Information Optics and Opto-electronic Technology,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences

出　　处：《Chinese Optics Letters》2013年第6期1-5,共5页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 61078050,60921004,and 61127013);the Shanghai Science and Technology Committee (No. 11DZ2290302)

摘　　要：A simplified modal method to explain the resonance phenomenon in guided mode resonance （GMR） grat- ings with asymmetric coatings is presented. The resonance observed is due to the interaction of two propagation modes inside the grating. The reflectivity spectra and electric field distributions calculated from the simplified modal method are compared using rigorous coupled-wave analysis （RCWA）. The in- fluences of high-order evanescent modes on the resonance peak are analyzed. A matrix Fabry-Perot （FP） resonance condition is developed to evaluate the resonance wavelength. An explanation for the resonance phenomenon observed based on the FP resonance phase condition is also proposed and demonstrated. The simplified method provides clear physical insights into CMR gratings that are useful for the analysis of a variety of other resonance gratings.A simplified modal method to explain the resonance phenomenon in guided mode resonance （GMR） grat- ings with asymmetric coatings is presented. The resonance observed is due to the interaction of two propagation modes inside the grating. The reflectivity spectra and electric field distributions calculated from the simplified modal method are compared using rigorous coupled-wave analysis （RCWA）. The in- fluences of high-order evanescent modes on the resonance peak are analyzed. A matrix Fabry-Perot （FP） resonance condition is developed to evaluate the resonance wavelength. An explanation for the resonance phenomenon observed based on the FP resonance phase condition is also proposed and demonstrated. The simplified method provides clear physical insights into CMR gratings that are useful for the analysis of a variety of other resonance gratings.

关 键 词：COATINGS Electric fields Guided electromagnetic wave propagation 

分 类 号：TN253[电子电信—物理电子学]