Dual-polarization Dirac cones in a simple 2D square lattice photonic crystal
Abstract
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 ) 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 20, 2020
- Source ID
- 10.1364/ol.389163
Entities
People
- Benjamin Wang
- Jesse A. Rodríguez
- M. A. Cappelli
Organizations
- Air Force Office of Scientific Research
- Krell Institute