Abstract
The present work describes a theoretical investigation of the near-field thermal radiation between doped Si plates coated with a mono-layer of graphene. It is found that the radiative heat flux between doped Si plates can be either enhanced or suppressed by introducing graphene layer, depending on the Si doping concentration and chemical potential of graphene. Graphene can enhance the heat flux if it matches resonance frequencies of surface plasmon at vacuum-source and vacuum-receiver interfaces. In particular, significant enhancement is achieved when graphene is coated on both surfaces that originally does not support the surface plasmon resonance. The results obtained in this study provide an important guideline into enhancing the near-field thermal radiation between doped Si plates by introducing graphene.
Highlights
It is well known that radiative heat transfer between two objects can exceed the maximum governed by Planck’s law of blackbody radiation if the distance between two objects is smaller than the characteristic wavelength of thermal radiation determined by Wien’s displacement law [1,2,3]
Because optical constants of doped Si highly depend on both doping concentration and temperature [13], there may exist mismatch in surface plasmon polariton (SPP) resonance frequencies of doped Si plates at different doping concentrations and temperatures, which in turn can impede the enhancement of thermal radiation
We consider the near-field thermal radiation of four configurations: (i) no graphene is coated on the source and receiver; (ii) graphene is coated on the source only; (iii) graphene is coated on the receiver only; and (iv) both source and receiver are coated with graphene
Summary
It is well known that radiative heat transfer between two objects can exceed the maximum governed by Planck’s law of blackbody radiation if the distance between two objects is smaller than the characteristic wavelength of thermal radiation determined by Wien’s displacement law [1,2,3]. “Plasmon enhanced near-field radiative heat transfer for graphene covered dielectrics,” Phys. The near-field thermal radiation between doped Si plates coated with graphene layer in Fig. 1 can be modelled as a multilayer system.
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