Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 64: Poster: Active Matter and Microswimmers (joint session DY/TT)

TT 64.7: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Nanoscale Temperature Imaging using Liquid Crystal Phase Transitions — •Martin Fränzl and Frank Cichos — Molecular Nanophotonics Group, Peter Debye Institute for Soft Matter Physics, Universität Leipzig, Germany

With the growing number of applications of thermoplasmonics in a variety of different fields there is a need to for a simple and reliable temperature measurement of optically heated metal nanostructure. We present a method to study such temperature distributions at the nanoscale utilizing the 5CB liquid crystal nematic-isotropic phase transition. The technique is based on a conventional optical microscopy and capable of imaging isothermal contours around heated nanostructures as well as to retrieve the absolute temperature increment. The setup is easy to implement with any conventional optical microscope requiring no external modifications of additional components. We demonstrate our technique for various plasmonic nanostructures such as gold nanoparticles, Janus particles and continuous gold films. The spatial resolution of this technique is diffraction limited and temperature variations smaller than 0.1 K can be detected.