Polarization-dependent continuous change in the propagation direction of Dirac-cone modes in photonic-crystal slabs

Kazuaki Sakoda
Phys. Rev. A 90, 013835 – Published 28 July 2014

Abstract

We show that the propagation direction of the Dirac-cone modes of photonic-crystal slabs can be continuously controlled by the polarization of the incident wave. This property is realized by their isotropic dispersion relation and anisotropic mixture of two dipolar wave functions. To clarify these features, we formulate a Green-function method to describe the excitation process of the Dirac-cone modes and analyze the coupling strength with the incident wave by group theory. This angular dependence of the intensity distribution of the excited wave can be used for experimentally detecting the Dirac cones and distinguishing their mode symmetry.

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  • Received 1 July 2014

DOI:https://doi.org/10.1103/PhysRevA.90.013835

©2014 American Physical Society

Authors & Affiliations

Kazuaki Sakoda

  • Photonic Materials Unit, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan and Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571, Japan

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Issue

Vol. 90, Iss. 1 — July 2014

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