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Twisted light Michelson interferometer for high precision refractive index measurements.
Optics Express
|October 27, 2022
Summary
This study introduces a novel twisted light interferometer for precise, non-invasive measurements. It accurately determines liquid concentration and temperature changes in real-time, crucial for microfluidic applications.
Area of Science:
- Optics and Photonics
- Interferometry
- Biomedical Sensing
Background:
- Traditional interferometry methods face limitations in sensitivity and applicability for in situ measurements.
- Orbital angular momentum (OAM) beams offer unique properties for advanced optical measurements.
Purpose of the Study:
- To demonstrate a twisted light interferometer for label-free, in situ monitoring of concentration and temperature.
- To achieve high sensitivity in refractive index measurements for microfluidic samples.
Main Methods:
- Utilizing a Michelson interferometer adapted with orbital angular momentum (OAM) beams.
- Directly measuring refractive index changes in NaCl and glucose solutions.
- Monitoring temperature variations in the millikelvin (mK) to microkelvin (µK) range.
Main Results:
- Achieved non-invasive refractive index measurements with sensitivity down to 10-6 refractive index units.
- Established a direct correlation between refractive index, concentration, and temperature for liquid samples.
- Demonstrated good agreement of extracted data with existing literature values.
Conclusions:
- Twisted light interferometry provides a novel, robust, and easily implementable method for in situ analysis.
- This technique is highly suitable for monitoring concentration and temperature changes in microfluidic systems.
- The method enables label-free and real-time characterization of liquid samples.
