GRAPHENE-BASED INFRARED BOLOMETER

摘要

An infrared bolometer. In one embodiment a waveguide configured to transmit infrared radiation is arranged to be adjacent a graphene sheet and configured so that evanescent waves from the waveguide overlap the graphene sheet. The graphene sheet has two contacts connected to an amplifier, and a power detector connected to the amplifier. Infrared electromagnetic power in the evanescent waves is absorbed in the graphene sheet, heating the graphene sheet. The power of Johnson noise generated at the contacts is proportional to the temperature of the graphene sheet. The Johnson noise is amplified and the power in the Johnson noise is used as a measure of the temperature of the graphene sheet, and of the amount of infrared power propagating in the waveguide.

主权项

1. An infrared bolometer comprising:
a waveguide configured to guide infrared electromagnetic waves, in a mode having an evanescent field extending outside of the waveguide; a graphene sheet having two contacts and configured:
to be coupled to the evanescent field;to have a temperature, when electromagnetic power in the evanescent field is absorbed by the graphene sheet, corresponding to the amount of electromagnetic power absorbed by the graphene sheet; andto generate thermal noise at the two contacts at a level corresponding to the temperature; and a circuit connected to the two contacts, the circuit configured to measure the thermal noise level.