Surface-Plasmon-Enhanced Near-Field Radiative Heat Transfer between Planar Surfaces with a Thin-Film Plasmonic Coupler
Mikyung Lim, Jaeman Song, Seung S. Lee, Jungchul Lee, Bong Jae Lee
Abstract
Here, we demonstrate a substantially increased near-field radiative heat transfer between asymmetric structures (i.e., doped $\mathrm{Si}$ and ${\mathrm{Si}\mathrm{O}}_{2}$) by using a thin $\mathrm{Ti}$ film as a plasmonic coupler. The measured near-field enhancement at vacuum gap of 380 nm is found to be 3.5 times greater than that for the case without the coupler. The enhancement mechanism is thoroughly elucidated for both polarizations, and a dimensionless parameter, which can quantify the coupling strength of the surface polaritons across the vacuum interfaces, is proposed.
Topics & Concepts
Surface plasmon polaritonMaterials scienceRadiative transferDimensionless quantityPlanarSurface plasmonPlasmonThin filmField (mathematics)PolaritonCoupling (piping)Surface (topology)Condensed matter physicsOptoelectronicsOpticsPhysicsNanotechnologyComputer scienceMathematicsMetallurgyPure mathematicsMechanicsGeometryComputer graphics (images)Thermal Radiation and Cooling TechnologiesUrban Heat Island MitigationQuantum Electrodynamics and Casimir Effect