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DS: Fachverband Dünne Schichten
DS 13: Optical Analysis of Thin Films I
DS 13.4: Talk
Thursday, March 30, 2023, 10:30–10:45, SCH A 316
IR dual-comb polarimetry of anisotropic nanofibers — •Karsten Hinrichs1, Brianna Blevins2, Andreas Furchner3, Nataraja Sekhar Yadavalli2, Sergiy Minko2, Raphael Horvath4, and Markus Mangold4 — 1Leibniz-Institut für Analytische Wissenschaften - ISAS e.V., Schwarzschildstraße 8, 12489 Berlin, Germany — 2Department of Chemistry, The University of Georgia — 3Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Division Energy and Information, Schwarzschildstraße 8, 12489 Berlin, Germany — 4IRsweep AG, Laubisruetistrasse 44, 8712 Staefa, Switzerland
In this work an anisotropic nanofiber scaffold is investigated non-invasively under ambient conditions by infrared dual-comb polarimetry (IR - DCP). Amplitude and phase spectra at various azimuthal sample rotations are correlated with the orientation of characteristic vibrational transition dipole moments. IR - DCP is proven as a new method for the spectral analysis (here 1200 cm-1 to 1300 cm-1) of such anisotropic samples in very short measurement times (0.065 ms) at 1.4 cm-1 spectral resolution. Such capabilities are in particular interesting for imaging applications, time resolved studies and hyperspectral spectroscopy of anisotropic samples. In difference to classical ellipsometry which measures phase differences, IR - DCP can measure s- and p-polarized phases separately. We acknowledge financial support by the EU through EFRE 1.8/13 and the Horizon 2020 grant 820419 and by the BMBF through CatLab (03EW0015A/B).