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Opt Lett. 2003 Jul 15;28(14):1197-9.

High transmission through waveguide bends by use of polycrystalline photonic-crystal structures.

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University of Delaware, Department of Electrical and Computer Engineering, 140 Evans Hall, Newark, Delaware 19716, USA.


A hybrid photonic-crystal structure is presented as a candidate for enhancing transmission through sharp photonic-crystal waveguide bends built on a perforated dielectric slab. This structure, which we refer to as a polycrystalline structure, combines two photonic-crystal lattices. Polycrystalline photonic-crystal structures offer the ability to minimize reflections as well as mismatches that a propagating wave might encounter while undergoing a sharp corner or a discontinuity between different waveguide sections. The availability of polycrystalline structures in photonic crystals opens a broad range of possibilities for the development of optical devices. Numerical experiments are performed with two- and three-dimensional finite-difference time domain methods.

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