Significant enhancement of near-field radiative heat transfer between black phosphorus-covered hyperbolic metamaterial

Abstract

Hyperbolic metamaterial, a novel type of anisotropic bulk material, can enhance the near-field radiation heat transfer (NFRHT) via supporting unbounded hyperbolic phonon polaritons (HPPs). A cutting-edge two-dimensional material, black phosphorous (BP), also gives a rise to promising performance in the NFRHT due to its excitation of surface plasmon polaritons (SPPs). Here, by coupling SPPs with HPPs, we have proposed a hybrid heterostructure that consists of a single top-covered BP layer with doped-Si nanowire arrays (D-SiNWs) and explored the NFRHT between two heterostructures separated by a vacuum gap. The hybrid heterostructure enables a significant enhancement of NFRHT contributed to the excited hybridized modes of BP plasmons and HPPs. The SPPs of BP expand the effective range of HPPs to the high-k space, resulting in a heat transfer coefficient that is 2.9 times and 1.7 times larger than that of two D-SiNWs and two monolayer BPs, respectively. Influences of electron density of BP are conclusively clarified from the profile of the plasma dispersion relation. Thus, it is expected that the proposed configuration can be used to regulate the near-field heat transfer in a tunable fashion and shed light on an invaluable technique toward the design of two-dimensional materials for thermal and electrical applications.