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10 September 2010 Anisotropic annular photonic crystal structure for large absolute band gap
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A two-dimensional anisotropic annular photonic crystal structure is presented to obtain an absolute photonic band gap. This structure is composed of circular air holes and dielectric rods in a triangular lattice. Uniaxial crystal is introduced to photonic crystal with extraordinary axis parallel to the extension direction of rods. The role of each dielectric and geometric parameter is investigated and a mid-gap ratio above 35% is realized by the parameter optimization. Large gap favors the structure with negative uniaxial veins and positive uniaxial rods. As the air-hole radius scales up, the dielectric-rods radius to sustain the maximum band gap scales down. The positive uniaxial material Tellurium is used to achieve a large polarization-insensitivity gap.
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Yong-ping Li, Peng Shi, and Kun Huang "Anisotropic annular photonic crystal structure for large absolute band gap", Proc. SPIE 7756, Active Photonic Materials III, 77561C (10 September 2010);

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