Tunable multichannel guided-mode resonance photonic crystal filter

A guided-mode resonance(GMR) filter which can work at multiple tunable frequencies is designed and obtained by using a readily available photonic crystal. The photonic crystal consists of several layers of dielectric rods with different radii in each layer. When light is incident upon this photonic crystal at a small incident angle, guided mode resonance in each rod layer will be excited. At the resonant frequencies, nearly 100% narrow reflection peaks with zero reflection sidebands, an excellent GRM filter, can be obtained. In addition, the resonant frequency of each layer is closely related to the radius of the rod and all the resonances of the whole structure almost don't interact with each other. Therefore, by adjusting the radii of the rods in each layer, the operating frequencies of the filter can be freely tuned both individually and simultaneously, a perfect tunable multichannel GMR photonic crystal filter is obtained. This optical device has apparent advantages, simple structure, small and compact size, easy fabrication and integration. Therefore, it has great application potential in modern optical network.