A semi-Dirac point and an electromagnetic topological transition in a dielectric photonic crystal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

84 Scopus citations

Abstract

Accidental degeneracy in a photonic crystal consisting of a square array of elliptical dielectric cylinders leads to both a semi-Dirac point at the center of the Brillouin zone and an electromagnetic topological transition (ETT). A perturbation method is deduced to affirm the peculiar linear-parabolic dispersion near the semi-Dirac point. An effective medium theory is developed to explain the simultaneous semi-Dirac point and ETT and to show that the photonic crystal is either a zero-refractive-index material or an epsilon-near-zero material at the semi-Dirac point. Drastic changes in the wave manipulation properties at the semi-Dirac point, resulting from ETT, are described.©2014 Optical Society of America.
Original languageEnglish (US)
Title of host publicationOptics Express
PublisherThe Optical Society
Pages1906
DOIs
StatePublished - Jan 21 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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