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Diffraction-free edge states in optical graphene

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Abstract

Optical graphene is a waveguide array arranged in a honeycomb lattice configuration (see Fig. 1) [1]. Due to the fact that the equation describing paraxial light propagation in optics is the Schrodinger equation (with the time coordinate replaced by the propagation distance, and the potential replaced by the refractive index profile), the optical beam behaves much like electrons do in ordinary graphene. Optical graphene may be used to study graphene physics beyond the reach of atomic systems, such as nonlinearity [2], addition of gain and loss, PT symmetry breaking [3], and disorder profiles that may be otherwise inaccessible.

© 2011 Optical Society of America

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