Freiburg 2019 – wissenschaftliches Programm
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FM: Fall Meeting
FM 73: Quantum Sensing: Applications & Spectroscopy
FM 73.4: Talk
Donnerstag, 26. September 2019, 14:45–15:00, Aula
Spectroscopy of nanoparticles without light — •Johannes Fiedler1,2, Clas Persson2, and Stefan Yoshi Buhmann1,3 — 1University of Freiburg, Freiburg, Germany — 2Centre for Materials Science and Nanotechnology, Oslo, Norway — 3Freiburg Institute for Advanced Studies, Freiburg, Germany
Spectroscopy is a tool for determining the electromagnetic response of particles, which is typically measured directly by exciting the investigated object with light. However, indirect measurements via interactions depending on this response provide an alternative methods. Dispersion forces are suitable candidates as they couple to the complete electromagnetic spectrum [1]. We propose a modification of well-studied Casimir experiments via atomic force microscopy [2] for determining the dielectric response of a test particle by adding a two-component liquid [3], leading to an enhancement of retardation and hence allowing for a reconstruction of spectral information based on spatial measurements.
[1] S.Y. Buhmann, Dispersion forces I, Springer (Heidelberg, 2012). [2] M. Sedighi et al., PRB 93, 085434 (2016). [3] J. Fiedler et al. submitted to PRB (2019).