SAMOP 2021 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 7: Poster 1

MO 7.21: Poster

Donnerstag, 23. September 2021, 17:30–19:30, P

Realization of dedicated holder for free standing liquid crystal films: first step towards High Harmonic Generation in Smectic Liquid Crystals — •Klara Maria Neumann, Patrick Friebel, Ivan Trancart, and Laura Cattaneo — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg

High harmonic generation (HHG) by a long-wavelength driving field has been recently used as an all-optical probe of the band structure of crystals and liquids (e.g. water) [1,2], showing that the tunneled out electronic wave packet is a sensitive probe of the materials symmetry. This provides an ultrafast all-optical non-invasive probe of the local order in the generating medium. To date, HHG in soft matter samples such as liquid crystals has not been investigated. In this work we present the realization of a holder for free standing liquid crystal films (FSLCF) with controllable thickness and temperature at an accuracy of ± 0.1K [3]. To form FSLCFs we use 8 CB (4′-n-octyl-4-cyano-biphenyl) liquid crystal, in smectic A phase at room temperature [3]. Thickness measurements are performed using a dedicated autocorrelator setup enabling a thickness control down to few tens of nanometers [4]. The FSLCF will be exposed to strong laser fields in the near infrared (5 µ m) to generate High Harmonics in the visible spectrum. [1] Vampa, G. et al. Nature 522, 462-464 (2015); [2] Luu, T.T. et al. Nature Communications, 9 (2018); [3] P. L. Poole et al. Applied Physics Letters 109, 151109 (2016); [4] https://www.brown.edu/research/labs/mittleman/sites/brown.edu.research.labs.mittleman/files/uploads/lecture14.pdf.