摘要
Two different triple-layer guided-mode resonance(GMR)filters with photonic crystal(PC)slab structures are designed,and their main optical properties are investigated.It is shown that under normal incidence,the PC slab GMR filters exhibit narrower bandwidth,a more symmetric line shape,and larger angular tolerance,compared with the planar grating GMR filters.The rod-slab type GMR filter works better than the hole-slab one.The resonance wavelength location and the angular tolerance can be tuned by varying the periods.The angular tolerance with narrow bandwidth can be improved by increasing the ratio of the periods in the two crossed directions.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 60877030,91121019 and 61021003
the National High Technology Research and Development Program of China under Grant No 2009AA03Z406.
