All-Optical Tunable Wavelength-Division Multiplexing Based on Colloidal Crystal Coated Silver Film |
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Authors: | Yu Zhu Xiaoyong Hu Cuicui Lu Yongyang Huang Qihuang Gong |
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Institution: | 1. State Key Laboratory for Mesoscopic Physics & Department of Physics, Peking University, Beijing, 100871, People??s Republic of China
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Abstract: | An all-optical tunable nanoscale wavelength-division multiplexing device is realized theoretically based on a plasmonic microstructure, which is composed of a silver film coated with a monolayer colloidal crystal made of cholesteryl iodide-doped polystyrene. The physical mechanism is attributed to the variation of surface plasmon polariton modes and guided modes caused by pump-laser-induced refractive index change of cholesteryl iodide. An up to 90-nm shift in the resonant wavelength of optical channels can be reached under excitation of a 500?mJ/cm2 pump laser. The number of optical channels can be tuned by adjusting the structure parameters of the monolayer colloidal crystal. This may open a new way for the study of integrated photonic devices. |
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