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Home > News > Graphene holds promise for hot-electron bolometers

August 25th, 2012

Graphene holds promise for hot-electron bolometers

Abstract:
The superior capability of graphene to limit electronic energy from being dissipated within the lattice makes it a fast photon detector with unprecedented sensitivity.

A bolometer is an electronic device that converts light into heat, which can then be detected by a thermometer. The thermal resistance, Rh, provides the coefficient linking incident power P and change in temperature ΔT, such that ΔT = PRh. An important consideration in designing a bolometer is the time taken for it to recover, given by τ = RhC, where C is the heat capacity. This has influenced the design of bolometers, which often used thin metal films with low C as absorbers that were suspended in vacuum with a spiderweb of fine nylon or Kevlar fibers to minimize thermal leak to the environment.

Source:
spie.org

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