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Updated: May 30, 2026
16:11
Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
Optical refractometer based on an asymmetrical twin-core fiber Michelson interferometer.
Ai Zhou1, Yanhui Zhang, Guangping Li
1Photonics Research Center, School of Science, Harbin Engineering University, Harbin 150001, China.
Optics Letters
|August 18, 2011
Summary
We developed a compact fiber optic refractometer using a Michelson interferometer. This device accurately measures refractive index changes by monitoring spectral shifts when the fiber core is exposed.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensing
- Interferometry
Background:
- Refractive index sensing is crucial for various applications.
- Compact and sensitive optical refractometers are in demand.
- Fiber interferometers offer potential for miniaturized sensing devices.
Purpose of the Study:
- To report and demonstrate a novel optical refractometer.
- To utilize a compact fiber Michelson interferometer for refractive index measurement.
- To investigate the sensing capabilities of an etched asymmetrical twin-core fiber.
Main Methods:
- Fabrication of a Michelson interferometer using asymmetrical twin-core fiber.
- Chemical etching of the fiber to expose the side core.
- Monitoring transmission spectrum shifts in response to environmental refractive index changes.
Main Results:
- The fiber Michelson interferometer demonstrated sensitivity to environmental refractive index.
- A refractive index resolution exceeding 800 nm/refractive index unit was achieved.
- The device operated effectively within the refractive index range of 1.34-1.37.
Conclusions:
- The developed fiber optic refractometer is a compact and effective sensing device.
- The proposed design shows promise for precise refractive index measurements.
- Etched asymmetrical twin-core fiber is a viable platform for optical sensing applications.
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