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May 8, 2026

Speckle-based measurement of the fractional azimuthal index of orbital angular momentum beams for refractive index sensing.

Christopher Perrella Aman Anil Punse Anastasiia Zalogina Crispin Szydzik Megan Lim Andreas Boes Arnan Mitchell Kylie R. Dunning Kishan Dholakia

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Key Points

This study aims to evaluate the use of speckle-based measurement techniques for sensing changes in refractive index.
Interrogated samples of sucrose and haemoglobin at 300 pL volume
Utilized a microfluidic channel for the experimental setup
Examined the fractional azimuthal index of orbital angular momentum beams
Demonstrated effective detection of refractive index variations in small sample volumes
Achieved precise measurements of the fractional azimuthal index
Indicated potential applications in biosensing and diagnostics

Implication

Measures refractive index using microfluidics in sucrose and haemoglobin samples, indicating effective sensing capability.

Abstract

refractive index units. Our study interrogates samples of sucrose and haemoglobin, only 300 pL in volume, within a microfluidic channel.

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Cite This Study

Perrella et al. (2026) studied this question.

synapsesocial.com/papers/6a0171ed3a9f334c2827209e https://doi.org/10.1038/s41467-026-72281-3

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Keep reading

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