Design of tunable terahertz photonic crystal narrow-band filters |
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Authors: | Hui Zhang Jin-jun Bai Peng Guo Xiang-hui Wang and Sheng-jiang Chang |
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Institution: | (1) Institute of Modern Optics, Nankai University, Tianjin, 300071, China |
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Abstract: | The coupling between the line defect and point defect in a two-dimensional photonic crystal is studied by using plane wave expansion method and finite difference time domain method. Based on the analysis, we propose a novel tunable terahertz narrow-band filter. Simulation results on the defect modes and output spectra show that the photonic crystal that consists of two line defects and one point defect can act as a tunable filter with narrow bandwidth of 0.02 THz under the control of an external electric field. |
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