S. Feng, Zhenlin Qu, M. Lv, Xiao Chen, Yiquan Wang, Wenzhong Wang
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Abstract
Optical characteristics of the multi-channel filters based on the two-dimensional photonic crystals with oval defects are studied. Shape alteration of the air hole from a circle to an ellipse offers a powerful approach to engineer the resonant wavelength of channel filters. It is found that the resonant wavelength can be flexibly adjusted only by changing the oval's obliquity. A six-channel side-coupled drop filters based on the oval holes with different obliquities is designed, and a good wavelength filtering ability is obtained.
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