Sub-wavelength antenna enhanced bilayer graphene tunable photodetector

摘要

The integration of bilayer graphene with an absorption enhancing sub-wavelength antenna provides an infrared photodetector capable of real-time spectral tuning without filters at nanosecond timescales.

主权项

1. A tunable photodetector, comprising:
a bilayer graphene layer; a gate dielectric layer disposed on the frontside of the bilayer graphene layer; a resonant sub-wavelength antenna top gate disposed on the gate dielectric layer, wherein the resonant sub-wavelength antenna top gate and the gate dielectric layer are adapted to amplify the absorption of incident light in the bilayer graphene layer by resonant surface mode coupling; a conductive back gate disposed on the backside and insulated from the bilayer graphene layer for applying an electric field with the top gate across the bilayer graphene layer to tune a bandgap therein; and a source and a drain disposed on the bilayer graphene layer with the gate dielectric layer therebetween, thereby forming a dual-gated field-effect transistor.