# An Optically-Programmable Absorbing Metasurface

## TL;DR

This paper introduces a tunable metasurface absorber that uses an optically-programmable dielectric to achieve frequency tuning without conventional semiconductor devices, operating at 5.5 GHz with a 150 MHz bandwidth.

## Contribution

It presents a novel optically-tunable metasurface absorber using a dielectric-based tuning mechanism instead of traditional semiconductor components.

## Key findings

- Achieves optical tuning of the absorption frequency.
- Operates effectively at 5.5 GHz with a 150 MHz bandwidth.
- Eliminates the need for semiconductor devices in RF tuning.

## Abstract

A tunable metasurface absorber is presented in this work using an optically-programmable capacitor as the tuning element. The tuning element does not employ conventional semiconductor technologies to operate but rather a bases its tuning by changing the optomechanical properties of its dielectric, poly disperse red 1 acrylate (PDR1A). Doing so there are no conventional semiconductor devices in the RF signal path. The metasurface operates at a design frequency of 5.5 GHz and it achieves an optically-tuned bandwidth of 150 MHz, from 5.50 GHz to 5.65 GHz.

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Source: https://tomesphere.com/paper/1907.11136