  We consider a three slabs configuration including two non-doped single layer
graphene on insulating silicon dioxide (G/SiO2) substrates and one non-doped
suspended single layer graphene (SG). The suspended layer is placed between two
G/SiO2 layers. Without SG layer, the heat flux has maximum at Plasmon frequency
supported by the G/SiO2 slabs. In three slabs configuration, the photon heat
tunneling is amplified between two G/SiO2 layers significantly, only for
specific range of vacuum gap between SG layer and G/SiO2 layers and Plasmon
frequency, due to the coupling of modes between each G/SiO2 layer and SG layer.
Since, the SG layer is a single atomic layer, the photon heat tunneling
assisted by this configuration does not depend on the thickness of middle layer
and in consequence, it can enable novel applications for nanoscale thermal
management.
