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Letter

Terahertz Time-Domain Polarimetry in Reflection for Film Characterization

Research Center for Non-Destructive Testing GmbH (RECENDT), Altenberger Straße 69, 4040 Linz, Austria
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Sensors 2020, 20(12), 3352; https://doi.org/10.3390/s20123352
Received: 15 May 2020 / Revised: 5 June 2020 / Accepted: 11 June 2020 / Published: 12 June 2020
(This article belongs to the Special Issue Advanced Industrial Terahertz Sensing Applications)
Terahertz time-domain spectroscopy is a useful technique to characterize layered samples and thin films. It gives access to their optical properties and thickness. Such measurements are done in transmission, which requires access to the sample from opposite sides. In reality this is not always possible. In such cases, reflection measurements are the only option, but they are more difficult to implement. Here we propose a method to characterize films in reflection geometry using a polarimetric approach based on the identification of Brewster angle and modeling of the measured signal to extract the refractive index and thickness of the sample. The technique is demonstrated experimentally on an unsupported single layer thin film sample. The extracted optical properties and thickness were in good agreement with established transmission terahertz spectroscopy measurements. The new method has the potential to cover a wide range of applications, both for research and industrial purposes. View Full-Text
Keywords: terahertz; time-domain spectroscopy; polarimetry; film characterization; brewster angle; thickness terahertz; time-domain spectroscopy; polarimetry; film characterization; brewster angle; thickness
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MDPI and ACS Style

van Frank, S.; Leiss-Holzinger, E.; Pfleger, M.; Rankl, C. Terahertz Time-Domain Polarimetry in Reflection for Film Characterization. Sensors 2020, 20, 3352. https://doi.org/10.3390/s20123352

AMA Style

van Frank S, Leiss-Holzinger E, Pfleger M, Rankl C. Terahertz Time-Domain Polarimetry in Reflection for Film Characterization. Sensors. 2020; 20(12):3352. https://doi.org/10.3390/s20123352

Chicago/Turabian Style

van Frank, Sandrine, Elisabeth Leiss-Holzinger, Michael Pfleger, and Christian Rankl. 2020. "Terahertz Time-Domain Polarimetry in Reflection for Film Characterization" Sensors 20, no. 12: 3352. https://doi.org/10.3390/s20123352

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