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We propose a line defect waveguide structure along the Gamma-Mu direction in two-dimensional triangular lattice silicon photonic crystal slabs. The modal dispersion relation and the transmission spectra of this waveguide are studied. The results show that by perturbing the width of the line defect and the diameter of the air holes adjacent to the waveguide core, one can control the width of the single mode transmission window and make it far broader than the original one. The proposed Gamma-Mu waveguide will help to build a more flexible network of interconnection channel of light in two-dimensional photonic crystal slabs.
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Liu et al. (2008) studied this question.
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