Modulation characteristics of graphene-based thermal emitters
Applied Physics Express
Japan Society of Applied Physics/ IOP Publishing
This is the final version of the article. Available from IOP Publishing via the DOI in this record.
© 2016 The Japan Society of Applied Physics. We have investigated the modulation characteristics of the emission from a graphene-based thermal emitter both experimentally and through simulations using finite element method modelling. Measurements were performed on devices containing square multilayer graphene emitting areas, with the devices driven by a pulsed DC drive current over a range of frequencies. Simulations show that the dominant heat path is from the emitter to the underlying substrate, and that the thermal resistance between the graphene and the substrate determines the modulation characteristics. This is confirmed by measurements made on devices in which the emitting area is encapsulated by hexagonal boron nitride.
This work has been undertaken as part of a UK EPSRC Fellowship in Frontier Manufacturing (GRN) grant no. EP=J018651=1, and of the project “GOSFEL”, which has received funding from the European Union for this research. The authors would also like to thank Choon How Gan for useful discussions.
Applied Physics Express, 2016, Vol. 9, Number 1