Near-field focusing and amplification of tip-substrate radiative heat transfer
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866915655357300736 |
|---|---|
| author | Vescovo, Milo Ben-Abdallah, Philippe Messina, Riccardo |
| author_facet | Vescovo, Milo Ben-Abdallah, Philippe Messina, Riccardo |
| contents | 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 non-dispersive 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_20760 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Near-field focusing and amplification of tip-substrate radiative heat transfer Vescovo, Milo Ben-Abdallah, Philippe Messina, Riccardo Mesoscale and Nanoscale Physics 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 non-dispersive 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. |
| title | Near-field focusing and amplification of tip-substrate radiative heat transfer |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.20760 |