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Graphene-based Plasmonic Phototransistor Provides Broadly Tunable, Narrowband Photo-response

Technology Benefits

Up to 40 percent change in channel conductanceFaster, greater sensitivity in light detection

Technology Application

Spectral sensingSituational awareness

Detailed Technology Description

Within the graphene phototransistor, photodetection occurs through an innovative combination of two transduction steps. 1) Incident photons are instantly converted with high efficiency to SPPΓÇÖs. 2) The SPP fields produce a measurable perturbation on graphene transport, where high speed is anticipated due to grapheneΓÇÖs high room-temperature carrier mobility and by potentially light-like speeds for information transfer via SPP propagation. The graphene sheet is positioned at the surface of a suitable photon-to-SPP excitation coupler. The SPPΓÇÖs are excited at a specific angle of incidence for a given wavelength. The intense SPP fields, in turn, penetrate, gate, dynamically dope, and excite traveling waves of charge density in the graphene, causing changes in its conductance by a variety of potential mechanisms that are sensed electrically.

Country/Region

USA

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