Exceptional Point Dynamics in Photonic Honeycomb Lattices with PT Symmetry

TL;DR

This paper explores how electromagnetic waves behave in complex honeycomb photonic lattices with PT symmetry, revealing a new type of conical diffraction where the cone's brightness and speed depend on the gain/loss parameter.

Contribution

It introduces a novel class of conical diffraction phenomena in PT-symmetric honeycomb lattices, demonstrating the impact of gain/loss arrangements on wave dynamics.

Findings

Discovered a brighter conical diffraction cone in PT honeycomb lattices.

The cone's transverse speed scales with the square root of the gain/loss parameter.

Identified a new class of wave phenomena related to PT symmetry in photonic structures.

Abstract

We theoretically investigate the flow of electromagnetic waves in complex honeycomb photonic lattices with local PT symmetries. Such PT structure is introduced via a judicious arrangement of gain or loss across the honeycomb lattice, characterized by a gain/loss parameter \gamma. We found a new class of conical diffraction phenomena where the formed cone is brighter and travels along the lattice with a transverse speed proportional to Sqrt (\gamma).