Enhancing near-field heat transfer between composite structures through strongly coupled surface modes

Abstract

In this work, we study the near-field heat transfer between composite nanostructures. It is demonstrated that thermally excited surface plasmon polaritons, surface phonon polaritons, and hyperbolic phonon polaritons in such composite nanostructures significantly enhance the near-field heat transfer. To further analyze the underlying mechanisms, we calculate energy transmission coefficients and obtain the near-field dispersion relations. The dispersion relations of composite nanostructures are substantially different from those of isolated graphene, silicon carbide (SiC) films, and SiC nanowire arrays due to the strong coupling effects among surface polaritonic modes. We identify four pairs of strongly coupled polaritonic modes with considerable Rabi frequencies in graphene/SiC film composite structures that greatly broaden the spectral peak. We confirm that near-field strong coupling effects between surface plasmon polaritons and hyperbolic phonon polaritons in the in-plane Reststrahlen band are different from those in the out-of-plane Reststrahlen band due to the different types of hyperbolicity. In addition, we analyze the effective tunability of the near-field heat transfer of graphene/SiC nanowire arrays composite structures by adjusting the chemical potential of graphene, the height and volume filling factor of the SiC nanowire arrays. This work provides a method to manipulate the near-field heat transfer with the use of strongly coupled surface polaritonic modes.

Role of disorder in plasmon-assisted near-field heat transfer between two-dimensional metals

“…In particular, in several works dedicated to different materials in the near-field regime, the important role played by collective plasmon excitations has been pointed out [19][20][21][22][23][24][25][26][27]. However, Ref.…”

Role of disorder in plasmon-assisted near-field heat transfer between two-dimensional metals

“…The intermediate "universal" regime, where the power depends only on the temperature, but not on the circuit, is present only when C C c . To relate results (24) to those of Sec. III, it is important to realise that while Eqs.…”

“…III, it is important to realise that while Eqs. (24) give the full transferred power, Eqs. (7) give the power per unit area.…”

“…In particular, in several works dedicated to different materials in the near-field regime, the important role played by collective plasmon excitations has been pointed out [17][18][19][20][21][22][23][24][25]. However, Ref.…”

Near-field radiative heat transfer between topological insulators via surface plasmon polaritons

“…r p , s is the reflection coefficient for p and s polarizations. In this study, atomic-scale topological insulators can be modeled as a conduction monolayer covering on a dielectric substrate, the reflection coefficients in Equation (4) can be commonly expressed as ( Zhang et al., 2019 ): in which ε s is the permittivity of the dielectric substrate, μ 0 is the permeability of vacuum, and is the z component of wavevector in the substrate.…”