Modulation of near-field radiative heat transfer between nanoparticles supported by a strained hBN film with graphene covered

Abstract

Dynamic modulation of near-field radiative heat transfer (NFRHT) requires changing the optical responses of the object, which is expected to be realized with the help of the strain engineering. Based on the electric dipole approximation and the reflection Green's function, in this work, we investigate the effect of the hBN film under uniform in-plane strain on the NFRHT between two graphene/SiC core-shell (GSCS) nanoparticles. By changing the magnitude of the strain on the film, the hyperbolic phonon polaritons (HPPs) can be dynamically tuned to match and deviate from the localized surface resonance (LSR), thus significantly modulating the NFRHT between the nanoparticles. When the two GSCS nanoparticles are placed above a strained hBN film, an amplification of the maximum radiative heat flux by about 6 orders of magnitude can be achieved. In addition, after the introduction of graphene to form graphene/hBN heterostructure, the radiative heat flux can be further enhanced with the help of the hybrid polaritons. Especially at a suitable chemical potential and strain, the NFRHT can be enhanced by 4 more orders of magnitude compared to the bare hBN film. This work provides a new insight into efficient and dynamic thermal management among nanoparticles.