Local density of states above a disk -- geometrical vs. thermal boundary conditions

Abstract

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 LDOS 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.

References in corpus (17)

• Near-field heat transfer in a scanning thermal microscope
• Definition and measurement of the local density of electromagnetic states close to an interface
• Imaging non-local electron transport via local excess noise
• Efficient Computation of Power, Force, and Torque in BEM Scattering Calculations
• Near-field thermal imaging of nanostructured surfaces
• Near-field radiative heat transfer between arbitrarily-shaped objects and a surface
• Strong tip-sample coupling in thermal radiation scanning tunneling microscopy
• Near-field radiative heat transfer for structured surfaces
• Strongly coupled near-field radiative and conductive heat transfer between planar objects
• Revisiting the Dipole Model for a Thermal Infrared Near-Field Spectroscope
• Conduction-radiation coupling between two closely-separated solids
• Spectral redshift of the thermal near field scattered by a probe
• Near-field Nanoscopy of Thermal Evanescent Waves on Metals
• Thermal radiation and near-field thermal imaging of a plasmonic Su-Schrieffer-Heeger chain
• Exact formulas for radiative heat transfer between planar bodies under arbitrary temperature profiles: modified asymptotics and sign-flip transitions
• Dipole model for far-field thermal emission of a nanoparticle above a planar substrate
• Hidden information in fluctuation in small systems