# Metallic nanorings for broadband, enhanced extraction of light from solid-state emitters

## TL;DR

This paper demonstrates that metallic nanorings can significantly enhance light extraction from solid-state emitters, achieving up to 20-fold increase, and are compatible with broadband applications and scalable fabrication methods.

## Contribution

The study introduces metallic nanorings as a broadband, scalable solution for enhancing light emission from solid-state sources, with additional functionalities like electric contact integration.

## Key findings

- Achieved up to 20x enhancement in emitted light intensity.
- Demonstrated broadband compatibility with various solid-state emitters.
- Proposed scalable fabrication techniques for metallic nanorings.

## Abstract

We report on the increased extraction of light emitted by solid-state sources embedded within high refractive index materials. This is achieved by making use of a local lensing effect by sub-micron metallic rings deposited on the sample surface and centered around single emitters. We show enhancements in the intensity of the light emitted by InAs/GaAs single quantum dot lines into free space as high as a factor 20. Such a device is intrinsically broadband and therefore compatible with any kind of solid-state light source. We foresee the fabrication of metallic rings via scalable techniques, like nano-imprint, and their implementation to improve the emission of classical and quantum light from solid-state sources. Furthermore, while increasing the brightness of the devices, the metallic rings can also act as top contacts for the local application of electric fields for carrier injection or wavelength tuning.