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

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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