Special control of the cutoff frequencies in a 2D photonic crystal coupled-cavity waveguide |
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Authors: | Xiyao Chen Ping Shum |
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Affiliation: | a Department of Physics and Electronic Information Engineering, Minjiang University, Fuzhou 350108, China b Network Technology Research Centre, Nanyang Technological University, Singapore |
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Abstract: | We show theoretically that the upper and lower cutoff frequencies of the guided band in a 2D photonic crystal coupled-cavity waveguide can be controlled independently or synchronously by changing two configuration parameters of the waveguide simultaneously. The independent control range for the lower and upper cutoff frequencies can be as large as 68.6% and 67.9% of photonic band gap, respectively. The two cutoff frequencies can also be tuned in the same direction over equal distances up to 25.7% of photonic band gap. These results offer an efficient way for designing the various dispersion relations for photonic crystal waveguides. |
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Keywords: | Photonic crystals Coupled-cavity waveguide Dispersion relation Cutoff frequency |
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