A new high transmission Y-junction based on two-dimensional photonic crystal waveguides of triangular lattice is designed. The Y-junction is designed by moving the corner rods of Y-junction into a resonant cavity and placing additional rods between the resonant cavity and the output waveguides. By changing the radius of the additional rods, the transmission coefficient of the Y-junction can be optimized. The coupled mode theory is used to explain the transmission properties. Two-dimensional numerical simulation is performed to verify the Y-junction structure with near-complete transmission. © 2010 Elsevier B.V. All rights reserved.
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