Polaritons in 2D-crystals and localized modes in narrow waveguides

TL;DR

This paper investigates 2D-polaritons in atomically thin layers within parallel-plate waveguides and explores how localized modes can be generated by atomic defects, with potential for tunable waveguide applications.

Contribution

It demonstrates the possibility of creating localized waveguide modes via atomic defects in 2D-crystals by adjusting the waveguide width.

Findings

Localized modes can be achieved with a single impurity or defect.

Waveguide width of about 10^4 times the lattice parameter is effective.

The study provides a method to control waveguide localization through structural parameters.

Abstract

We study 2D-polaritons in an atomically thin dipole-active layer (2D-crystal) placed inside a parallel-plate wavegude, and investigate the possibility to obtain the localized wavegude modes associated with atomic defects. Considering the wavegude width, $l,$ as an adjustable parameter, we show that in the waveguide with $l\sim 10^{4} a,$ where $a$ is the lattice parameter, the localized mode can be provided by a single impurity or a local structural defect.