Dual-polarization Dirac cones in a simple 2D square lattice photonic crystal

Rodríguez, J. A.; Wang, B.; Cappelli, M. A.

doi:10.1364/OL.389163

Dual-polarization Dirac cones in a simple 2D square lattice photonic crystal

Journal Article · Mon Apr 20 00:00:00 EDT 2020 · Optics Letters

DOI:https://doi.org/10.1364/OL.389163· OSTI ID:1615080

; Wang, B.; Cappelli, M. A.

We report on dual-polarization Dirac cones in a simple square lattice two-dimensional (2D) photonic crystal (PC) based on transmission at accidental degeneracies centered at the $k = 0$ symmetry ( $Γ <#comment/>$ ) point. Finite difference time domain simulations are used to identify the material and geometric parameters for Dirac-like dispersion. A configuration that produces a Dirac-like point for both transverse electric and transverse magnetic polarizations at the same frequency is presented. The PC dispersion shows the expected threefold degenerate linear branch crossings at the Dirac-like point. Full-field electromagnetic wave simulations exhibit some common behaviors of devices based on Dirac-like dispersion, such as cloaking and waveguiding. The configuration works for a considerable range of the parameter space, and thus is experimentally realizable with a wide range of materials.

Sponsoring Organization:: USDOE

OSTI ID:: 1615080

Alternate ID(s):: OSTI ID: 1804039

Journal Information:: Optics Letters, Journal Name: Optics Letters Journal Issue: 9 Vol. 45; ISSN 0146-9592; ISSN OPLEDP

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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