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19 February 2009 Creating large bandwidth photonic crystal slab waveguide by tailoring the dispersion curve of waveguide mode
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Abstract
In the photonic crystal (PhC) slab, a waveguide is typically created by introducing a line defect into the perfect periodic lattice, and the waveguide modes will appear within the photonic band gap. An practical waveguide should possess sufficient single-mode bandwidth and display minimal group velocity dispersion within the bandwidth. By adjusting the air holes adjacent to the line defect, the dispersion curves of waveguide modes can be tailored and the requests above are reached. In this way, an air-bridge slab waveguide gets a single-mode bandwidth of 0.025 c/a, where c is the light speed in vacuum and a is the lattice constant of the photonic crystal. In addition, an SOI (Silicon-on-Insulator) slab waveguide receives a single-mode bandwidth of 0.007 c/a and a frequency window of 0.003 c/a with a nearly constant group velocity of 0.082 c.
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Kan Chen, Dongxiao Yang, and Wenjun He "Creating large bandwidth photonic crystal slab waveguide by tailoring the dispersion curve of waveguide mode", Proc. SPIE 7279, Photonics and Optoelectronics Meetings (POEM) 2008: Optoelectronic Devices and Integration, 72791Q (19 February 2009); https://doi.org/10.1117/12.823337
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