# Gapless Unidirectional Photonic Transport Using All-Dielectric Kagome Lattices

## TL;DR

This paper demonstrates a broadband, highly efficient unidirectional photonic edge mode in an all-dielectric kagome lattice, leveraging the quantum valley Hall effect for robust light transport at telecommunication wavelengths.

## Contribution

It introduces an all-dielectric kagome lattice design enabling gapless unidirectional photonic transport with suppressed reflection and minimal losses.

## Key findings

- Broadband suppressed reflection at sharp corners
- Negligible vertical losses at telecommunication wavelengths
- Effective unidirectional edge mode propagation

## Abstract

Photonic topological insulators are a promising photonic platform due to the possibility of unidirectional edge states with insensitivity to bending, fabrication imperfections or environmental fluctuation. Here we demonstrate highly efficient unidirectional photonic edge mode propagation facilitated by an optical analogue of the quantum valley Hall effect. With an all-dielectric kagome lattice design, we demonstrate broadband suppressed reflection in the presence of sharp corners and further show negligible vertical losses in a semiconductor-based device at telecommunication wavelengths.