Abstract
A novel coupled-cavity waveguide based on two-dimensional triangular lattice photonic crystals was proposed.This structure was composed of the line-defect waveguides,resonant microcavity,and ellipse-holes which are located between line-defect waveguide and resonant micro-cavity.The band structure of line-defect waveguide was simulated by the method of the plane-wave expansion.The transmission characteristics and quality factor of the coupled-cavity waveguides were investigated by the finite-difference time-domain(FDTD) method.By optimizing the structural parameters such as amount,size,and arrangement of ellipse-holes between the resonant micro-cavity and the line-defect waveguide,a 90% transmission efficiency was obtained with a Q-factor of 104.Then,appropriate parameters were selected,a high Q-factor of 107was achieved,the transmission efficiency corresponding to the resonance frequency was still above 60%.
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