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Opt Lett. 2003 May 1;28(9):734-6.

Reduction of propagation and bending losses of heterostructured photonic crystal waveguides by use of a high-delta structure.

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  • 1New Industry Creation Hatchery Center, Tohoku University, Aramaki-Aza-Aoba 04, Sendai 980-8579, Japan.


We describe the fabrication and evaluation of a low-loss, high-delta optical waveguide consisting of heterostructured photonic crystals. The waveguide is composed of a multilayer stack of Ta2O5/SiO2 and is prepared by use of the autocloning technique. Light is guided in the waveguide by the difference in the effective refractive indices of the constituent photonic crystals. By improving the design of the core region so that is has a flat multilayer structure, we achieve delta = 3.09% for the in-plane direction and net propagation loss of 0.56 dB/mm at lambda = 1.6 microm. Experiments also suggest that the bending loss of the waveguide can be reduced to less than 0.1 dB if the curvature radius is larger than 700 microm.

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