Repeatability of material parameter extraction of liquids from transmission terahertz time-domain measurements

Recently, many research groups worldwide have reported on the THz properties of liquids. Often these parameters, i.e., refractive index and absorption coefficient, are determined using liquids in cuvettes and terahertz time-domain spectroscopy. Here, we discuss the measurement process and determine...

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Veröffentlicht in:Optics express 2020-09, Vol.28 (19), p.28178-28189
Hauptverfasser: Ornik, Jan, Lehr, Jannik, Reuter, Marco, Jahn, David, Beltran-Mejia, Felipe, Balzer, Jan C., Kleine-Ostmann, Thomas, Koch, Martin
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container_end_page 28189
container_issue 19
container_start_page 28178
container_title Optics express
container_volume 28
creator Ornik, Jan
Lehr, Jannik
Reuter, Marco
Jahn, David
Beltran-Mejia, Felipe
Balzer, Jan C.
Kleine-Ostmann, Thomas
Koch, Martin
description Recently, many research groups worldwide have reported on the THz properties of liquids. Often these parameters, i.e., refractive index and absorption coefficient, are determined using liquids in cuvettes and terahertz time-domain spectroscopy. Here, we discuss the measurement process and determine how repeatable such measurements and the data extraction are using rapeseed oil as a sample. We address system stability, cuvette positioning, cuvette cleaning and cuvette assembly as sources affecting the repeatability. The results show that system stability and cuvette assembly are the most prominent factors limiting the repeatability of the THz measurements. These findings suggest that a single cuvette with precise positioning and thorough cleaning of the cuvette delivers the best discrimination among different liquid samples. Furthermore, when using a single cuvette and measurement systems of similar stability, the repeatability calculated based on several consecutive measurements is a good estimate to tell whether samples can be discriminated.
doi_str_mv 10.1364/OE.403159
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title Repeatability of material parameter extraction of liquids from transmission terahertz time-domain measurements
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