# Chalcogenide hyperbolic metamaterial with switchable negative refraction

## TL;DR

This paper demonstrates a novel, switchable hyperbolic metamaterial using chalcogenide glass, enabling reconfigurable optical properties across a broad spectrum for advanced nanophotonic applications.

## Contribution

It introduces the first non-volatile, phase-change-based hyperbolic metamaterial using GST alloy, allowing dynamic switching of hyperbolic dispersion from infrared to visible.

## Key findings

- Successfully demonstrated switchable hyperbolic dispersion.
- Achieved non-volatile reconfigurability through phase change.
- Enabled potential for reconfigurable optical devices.

## Abstract

Chalcogenide glasses are exceptional materials that show a wide contrast in optical properties upon phase change and are highly researched for reconfigurable electronic and nanophotonic devices. Here, we report the first proof-of-concept demonstration of a non-volatile, switchable hyperbolic metamaterial based on a chalcogenide glass. By using the $Ge_{2}Sb_{2}Te_{5}$ (GST) alloy as one of the components of a multilayered nanocomposite structure and exploiting its phase change property, we demonstrate a hyperbolic metamaterial in which the Type-I hyperbolic dispersion $({\epsilon}_{\perp} < 0, {\epsilon}_{\parallel} > 0)$ can be switched from the near infrared to the visible region. This opens up new opportunities for reconfigurable device applications, such as imaging, optical data storage and sensing.

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Source: https://tomesphere.com/paper/1703.10753