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J Phys Condens Matter. 2012 Dec 12;24(49):492203. doi: 10.1088/0953-8984/24/49/492203. Epub 2012 Nov 16.

Wideband trapping of light by edge states in honeycomb photonic crystals.

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Department of Physics, Key Laboratory of Micro- and Nano-Photonic Structures, Fudan University, Shanghai 200433, People's Republic of China.


We study theoretically light propagations at the zigzag edge of a honeycomb photonic crystal consisting of dielectric rods in air, analogous to graphene. Within the photonic band gap of the honeycomb photonic crystal, a unimodal edge state may exist with a sharp confinement of optical fields. Its dispersion can be tuned simply by adjusting the radius of the edge rods. For the edge rods with a graded variation in radius along the edge direction, we show numerically that light beams of different frequencies can be trapped sharply in different spatial locations, yielding wideband trapping of light.

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