Mid-infrared photodetector based on 2D material metamaterial with negative index properties for a wide range of angles near vertical illumination

TL;DR

This paper introduces a novel mid-infrared photodetector using graphene-based negative-index metamaterials that enhances quantum efficiency across various incident angles, suitable for integrated silicon photonics.

Contribution

It proposes a low-loss dielectric metamaterial with nano/microholes supporting resonance, improving coupling and efficiency in graphene-based mid-infrared photodetectors.

Findings

Enhanced quantum efficiency over a wide range of angles

Effective coupling at near-normal incidence

Low-loss dielectric metamaterial design

Abstract

We present the vertically illuminated Si compatible mid-infrared photodetectors based on graphene that forms negative-index metamaterial. The coupling into a 2D layer at the angles near normal to the surface is negligible without the help of a metamaterial. We propose a low loss metamaterial, the dielectric structure with the nano/microholes through 2D materials that supports a resonance and enhances quantum efficiency in a wide range of incident angles.