Multi-timescale infrared quantum cascade laser ellipsometry
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Published:2022-05-26
Issue:11
Volume:47
Page:2834
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ISSN:0146-9592
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Container-title:Optics Letters
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language:en
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Short-container-title:Opt. Lett.
Author:
Furchner Andreas1ORCID,
Kratz Christoph2ORCID,
Rappich Jörg1,
Hinrichs Karsten2ORCID
Affiliation:
1. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH
2. Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V.
Abstract
We recently introduced a versatile infrared laser ellipsometer for sub-decisecond spectroscopy [Opt. Lett. 44, 4387 (2019)10.1364/OL.44.004387] and 0.03 mm2 spot-sized hyperspectral imaging [Opt. Lett. 44, 4893 (2019)10.1364/OL.44.004893]. Here we report on the next device generation for thin-film sensitive simultaneous single-shot amplitude and phase measurements. The multi-timescale ellipsometer achieves 10 µs time resolution and long-term stability over hours at high spectral resolution (0.2 cm−1). We investigate the temporal stages (from minutes to milliseconds) of fatty acid thin-film formation upon solvent evaporation from acetone-diluted microliter droplets. Optical thickness variations, structure modifications, and molecular interactions are probed during the liquid-to-solid phase transition. Multi-timescale ellipsometry could greatly impact fields like in situ biosensing, microfluidics, and polymer analytics, but also operando applications in membrane research, catalysis, and studies of interface processes and surface reactions.
Funder
European Regional Development Fund
Ministerium für Innovation,Wissenschaft und Forschung des Landes Nordrhein-Westfalen
Die Regierende Bürgermeisterin von Berlin – Senatsverwaltung Wissenschaft, Gesundheit, Pflege und Gleichstellung
Bundesministerium für Bildung und Forschung
Publisher
Optica Publishing Group
Subject
Atomic and Molecular Physics, and Optics
Cited by
2 articles.
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