Dresden 2020 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster: Optical Analysis of Thin Films

DS 32.8: Poster

Wednesday, March 18, 2020, 15:00–18:00, P1A

Hyperspectral and Time-Resolved IR Laser Polarimetry — •Christoph Kratz, Andreas Furchner, and Karsten Hinrichs — Leibniz-Institut für Analytische Wissenschaften -ISAS- e.V., Berlin, Germany

Beyond classical FT-IR and synchrotron IR spectroscopy, the analysis of composition, structure and heterogeneity of complex surfaces and thin films is significantly advanced by a new generation of IR polarimeters [1]. We developed a novel laser-based IR technique enabling time and spatially resolved 5D analytics by combining a tunable QC laser with a single-shot ellipsometer [2,3]. Specifications are 0.5 cm⁻¹ spectral resolution, <125 µm spatial resolution, 20 µs temporal resolution for single wavelength and 100 ms for spectral investigations [2,3]. Large area mapping (50 x 50 mm²) and time-resolved studies under ambient conditions [2], as well as coupling with humid or liquid flow cells for in-situ IR spectroscopy (e.g. IR nL microfluidics [4]) are possible. Presented examples are chemical and structural heterogeneity investigations of organic thin films, and the solid-liquid phase transition of a myristic acid film. Funding: EFRE 1.8/13, in cooperation with Sentech Instruments GmbH.

[1] K. Hinrichs et al, JVST B 37, 060801 (2019).

[2] A. Furchner et al., Optics Letters 44.19: 4893-4896 (2019).

[3] A. Furchner et al., Optics Letters 44.17: 4387-4390 (2019).

[4] C. Kratz et al., ACS Sensors, 3:299-303 (2018).