Local density of states above a disk—Geometrical vs thermal boundary conditions

We analytically calculate the contribution to the local density of states due to thermal sources in a disk-like patch within the framework of fluctuational electrodynamics. We further introduce a wavevector cutoff method to approximate this contribution. We compare the results obtained with the sour...

Full description

Saved in:
Bibliographic Details
Published in:Journal of applied physics 2023-07, Vol.134 (4)
Main Authors: Biehs, Svend-Age, Kittel, Achim, An, Zhenghua
Format: Article
Language:English
Subjects:
Applied physics
Boundary conditions
Density of states
Electrodynamics
Mathematical analysis
Temperature profiles
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We analytically calculate the contribution to the local density of states due to thermal sources in a disk-like patch within the framework of fluctuational electrodynamics. We further introduce a wavevector cutoff method to approximate this contribution. We compare the results obtained with the source and cutoff method with the numerical exact local density of states above a metal disk attained by SCUFF-EM calculations. By this comparison, we highlight the difference and resemblance of thermal and geometrical boundary conditions which are both relevant for near-field scanning microscope measurements. Finally, we give an outlook to general lateral temperature profiles and compare it with surface profiles.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0155610