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Implementation of a Reference Interferometer for Nanodetection

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Miniature highly-birefringent microfiber loop with extremely-high refractive index sensitivity.

Lipeng Sun¹, Jie Li, Yanzhen Tan

¹Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.

|April 27, 2012

Summary

A novel miniature polarimetric interferometer using twisted microfiber demonstrates high sensitivity for refractive index sensing. This compact device offers excellent temperature stability, showing potential for advanced optical applications.

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Area of Science:

Optics and Photonics
Fiber Optics
Interferometry

Background:

Polarimetric interferometers are crucial for optical sensing.
Highly-birefringent microfibers offer unique light manipulation properties.
Twisting microfibers can alter their polarization characteristics.

Purpose of the Study:

To demonstrate a compact polarimetric interferometer.
To investigate the effect of microfiber twist on spectral characteristics.
To evaluate the sensitivity and stability of the device for sensing applications.

Main Methods:

Fabrication of a miniature polarimetric interferometer using a twisted highly-birefringent microfiber.
Analysis of transmission spectral characteristics influenced by birefringence and twist.

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Measurement of the device's sensitivity to refractive index changes.

Assessment of temperature stability.

Main Results:

The device exhibits transmission spectral characteristics governed by microfiber birefringence and twist.
Extremely-high sensitivity of approximately 24,373 nm per refractive-index unit was achieved.
Excellent temperature stability better than 0.005 nm/°C was demonstrated.
The interferometer is compact, reconfigurable, stable, and robust.

Conclusions:

The twisted microfiber polarimetric interferometer is a promising platform for high-sensitivity optical sensing.
The device's features make it suitable for tunable filtering, sensing, and multi-wavelength lasing.
This compact and stable design offers advantages over existing fiber optic sensing technologies.