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O: Fachverband Oberflächenphysik

O 19: Poster Monday: Scanning Probe Techniques 1

O 19.5: Poster

Monday, September 5, 2022, 18:00–20:00, P4

Sphere Probes for Scanning Thermal Microscopy — •Sophie Rodehutskors, Fridolin Geesmann, Philipp Thurau, and Achim Kittel — Insitut für Physik, Carl-von-Ossietzky Universität Oldenburg

Scanning thermal microscopes based on STM and AFM have been used for years to observe near-field mediated heat transfer. Using custom-built coaxial thermocouple tips in an STM setup, spatially highly resolved heat transfer measurements are possible [1]. The total heat transfer between a spherically approximated tip and a sample is expected to depend on the square of the tip's radius [2]. By attaching a 20 μm borosilicate sphere to such a coaxial thermocouple sensor, heat flux sensitivity is further increased in distance-dependence measurements of the heat transfer between a cooled sample and a tip at room temperature for different materials. These sensors can be used for highly resolved radiative heat transfer measurements as well as for heat conduction measurements through self-assembled monolayers of organic molecules.

[1] K. Kloppstech et al., Nat. Commun., 8, 14475 (2017)

[2] E. Rousseau et al., Nat. Photonics 3.9, 514-517 (2009)