Special control of the cutoff frequencies in a 2D photonic crystal coupled-cavity waveguide

摘要

We show theoretically that the upper and lower cutoff frequencies of the guided band in a 2D photonic crystal coupled-cavity waveguidecan 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 68.6percent and 67.9percent of photonic band gap, respectively. The two cutoff frequencies can also be tuned in the same direction over equal distances up to 25.7percent of photonic band gap. These results offer an efficient way for designing the various dispersion relations for photonic crystal waveguides.