Patent ID: 9293627
Filing Date: 2016-03-22
CPC Classification: H01L,Y02E

Claim Text:
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.