鉴别用变方位角导模共振滤光片的设计

设计了在0°和90°方位角下都具有低旁带的鉴别用导模共振滤光片。利用严格的耦合波理论，分析了这种器件在不同入射角、不同光栅槽深和覆盖不同厚度SiO2层情况下的衍射特性。得到了满足鉴别要求的导模共振滤光片结构。在30°入射角情况下，对于TE模式偏振光，设计的滤光片在0°和90°方位角下都有形状对称的反射光谱、低的旁带、两个位置分开的共振峰和适当的半宽度。

Guided mode resonant filters (GMRFs) for authentication application with low sideband reflection at 0 degrees and 90 degrees azimuthal angles were designed. Using rigorous coupled-wave analysis, the diffractive characteristics of this kind device with different illumination angles, groove depths, and thickness of cover SiO2 layer were investigated. The structure of GMRF which satisfies the requirements for authentication applications was obtained. Illuminated at 30 degrees for a definite polarization mode, the filter presents symmetrical reflectance shape, low sideband reflectance, two seperate reflectance peaks, and definite full-width at half-maximum (FWHM) at 0 degrees and 90 degrees azimuthal angles.

National Basic Research Program of China [2007CB935303]; Shanghai Committee of Science and Technology [06DZ22016, 07DZ22026]