High-precision interferometry with helical light beams

Nicola M. Kerschbaumer; Lucas I. Fochler; Michael Reichenspurner; Theobald Lohmueller; Michael Fedoruk; Jochen Feldmann

doi:10.1117/12.2609546

9 March 2022 High-precision interferometry with helical light beams

Nicola M. Kerschbaumer, Lucas I. Fochler, Michael Reichenspurner, Theobald Lohmueller, Michael Fedoruk, Jochen Feldmann

Author Affiliations +

Proceedings Volume PC12016, Optical and Quantum Sensing and Precision Metrology II; PC1201630 (2022) https://doi.org/10.1117/12.2609546
Event: SPIE OPTO, 2022, San Francisco, California, United States

Abstract

We demonstrate a highly sensitive approach for concentration measurements by Michelson interferometry with twisted helical light beams. When superimposing two helical light beams with opposing topological charge, a characteristic daisy flower interference pattern is generated which rotates when a phase shift is introduced in one of the interferometer arms. By analyzing the change in the interference pattern caused by a microfluidic sample, we can determine the refractive index and therefore the concentration of aqueous samples such as glucose and NaCl minimally invasive and label-free with a sensitivity on the order of 10e-6 refractive index units.

Conference Presentation

Citation Download Citation

Nicola M. Kerschbaumer, Lucas I. Fochler, Michael Reichenspurner, Theobald Lohmueller, Michael Fedoruk, and Jochen Feldmann "High-precision interferometry with helical light beams", Proc. SPIE PC12016, Optical and Quantum Sensing and Precision Metrology II, PC1201630 (9 March 2022); https://doi.org/10.1117/12.2609546

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