Graphene Plasmonic Mid-Infrared Photodetector

Abstract

Graphene plasmons can resonantly enhance the incident light absorption and offer an attractive feature of potential for tunable spectral selectivity for mid-infrared detection. Photodetectors that can convert optical signals into electrical signals for postprocessing play an important part in photonic chips for various practical applications in information communication, astronomy observation, imaging, and macromolecule detection. 2D materials such as the graphene family and layered transition metal dichalcogenides have aroused great attention, due to their intriguing physical properties among photoelectricity and condensed matter physics. Graphene surface plasmon polariton naturally depends on the physical properties of graphene itself. The patterned-graphene-based tunable photodetector is studied at room temperature, and applied with a free-space beam from the top at a normal angle.