title: Wideband trapping of light by edge states in honeycomb photonic crystals.
abstract: 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.
authors.affiliation: Department of Physics, Key Laboratory of Micro- and Nano-Photonic Structures, Fudan University, Shanghai 200433, People's Republic of China.
authors.forename: Chunfang
authors.initials: C
authors.lastname: Ouyang
authors.forename: Dezhuan
authors.initials: D
authors.lastname: Han
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Zhao
authors.forename: Xinhua
authors.initials: X
authors.lastname: Hu
authors.forename: Xiaohan
authors.initials: X
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Zi