Year: 2025
Type: article
Abstract: The spatially resolved near-field radiative heat transfer between a nanoscale probe and a substrate is studied in the fluctuational electrodynamics framework within the dipolar approximation. It is shown that the introduction of a thin polar film atop a nondispersive substrate can lead to both an enhancement and a lateral focusing of the heat exchange. The influence of the probe-substrate separation, film thickness, and substrate permittivity is analyzed, revealing that the effect originates from near-field interactions governed by the interplay between film-induced modifications of electromagnetic mode dispersion and the distance-dependent coupling strength. The results highlight a viable route toward the active control of local radiative heat transfer at the nanoscale.
Source: Physical Review Applied
DOI: 10.1103/njnd-12n5
Authors: M. Vescovo, P. Ben-Abdallah, R. Messina
Language: English
Subfield: Civil and Structural Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4417034256