Comparative Analysis of Room Temperature Plasmonic Graphene Hot Electron Bolometric Photodetectors

TL;DR

This paper evaluates a waveguide-integrated plasmonic graphene photodetector that leverages hot carrier effects, achieving high responsivity and gigahertz-speed, with a theoretical model predicting significant improvements over existing detectors.

Contribution

It introduces a theoretical framework for graphene bolometric photodetectors based on band nonparabolicity, predicting enhanced responsivity without sacrificing speed.

Findings

Responsivity can reach hundreds of AW-1.

Speed remains in the hundreds of GHz range.

Potential two orders of magnitude increase in responsivity.

Abstract

We appraise a waveguide-integrated plasmonic graphene photodetector based on the hot carrier photo-bolometric effect, with performance characterized simultaneously by high responsivity, on the scale of hundreds of AW-1, and high speed on the scale of 100s of GHz. Performance evaluation is based on a theory of bolometric effect originating from the band nonparabolicity of graphene. Results compare favorably with the state-of-the-art plasmonic bolometric photodetectors, predicting up to two orders of magnitude increase in a responsivity while keeping speed on the same level, defined by the electron-lattice scattering time in graphene.