# Enhanced Optical Limiting of Gold Nanoparticles/Porous Carbon Nanocomposites

## TL;DR

This paper explores how combining gold nanoparticles with porous carbon improves optical limiting, which could help protect eyes and detectors from lasers.

## Contribution

The study introduces Au NPs/PC nanocomposites with enhanced optical limiting properties compared to porous carbon alone.

## Key findings

- Au NPs/PC nanocomposites have a lower damage threshold than porous carbon.
- The nanocomposites exhibit a larger optical limiting index and broader absorption spectrum.
- The interaction between gold nanoparticles and porous carbon enhances nonlinear scattering.

## Abstract

With the wide application of laser weapons, the requirements of laser protection technology are becoming more and more strict. Therefore, it is important to find ideal optical limiting (OL) materials to protect human eyes and detectors. In this work, the nonlinear optical responses of gold nanoparticles/porous carbon (Au NPs/PC) nanocomposites prepared by the reduction method were studied using the nanosecond Z-scan technique. Compared with porous carbon, the Au NPs/PC nanocomposites show a lower damage threshold, a bigger optical limiting index and a wider absorption spectrum. The interaction between gold nanoparticles and porous carbon enhances the nonlinear scattering effect of suspended bubbles. These results indicate that Au NPs composites have potential applications in the protection of human eyes and detectors.