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, rendering wideband trapping of light.

7 pages, 3 figure

References in corpus (5)

• The electronic properties of graphene
• Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal
• Observing Zitterbewegung for photons near the Dirac point of a two-dimensional photonic crystal
• Extremal transmission at the Dirac point of a photonic band structure
• Dirac Spectra and Edge States in Honeycomb Plasmonic Lattices