Twisted light Michelson interferometer for high precision refractive index measurements

Kerschbaumer, Nicola M.; Fochler, Lucas; Reichenspurner, Michael; Rieger, Sebastian; Fedoruk, Michael; Feldmann, Jochen und Lohmüller, Theobald (2022): Twisted light Michelson interferometer for high precision refractive index measurements. In: Optics Express, Bd. 30, Nr. 16: S. 29722-29734

Abstract

Using orbital angular momentum beams in a Michelson interferometer opens the possibility for non-invasive measurements of refractive index changes down to 10(-6) refractive index units. We demonstrate the application of a twisted light interferometer to directly measure the concentration of NaCl and glucose solutions label-free and in situ and to monitor temperature differences in the mK-mu K range. From these measurements we can extract a correlation of the refractive index to concentration and to temperature from a liquid sample which is in good agreement with literature. Applying this type of twisted light interferometry yields a novel, robust, and easily implementable method for in situ monitoring of concentration and temperature changes in microfluidic samples. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 1094-4087
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 491502892
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 201269156