# Breaking refractive index records with layered van der Waals GeS2 for blue and near-ultraviolet photonics

## TL;DR

GeS2, a layered material, shows record-high refractive index and optical anisotropy in blue and near-ultraviolet light, opening new possibilities for short-wavelength photonics.

## Contribution

The discovery of GeS2's record refractive index and extreme optical anisotropy in blue and near-ultraviolet ranges is novel for photonics.

## Key findings

- GeS2 exhibits record-high refractive index in blue and near-ultraviolet bands.
- The material shows extreme optical anisotropy, making it promising for short-wavelength photonics.

## Abstract

GeS2, a layered a wide bandgap van der Waals material, is now found to exhibit record-high refractive index and extreme optical anisotropy across blue and near-ultraviolet bands, promising bright future for short-wavelength photonics.