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Optofluidic magnetometer developed in a microstructured optical fiber.

A Candiani¹, M Konstantaki, W Margulis

¹Foundation for Research and Technology-Hellas, Institute of Electronic Structure and Laser, Heraklion, Greece.

|November 2, 2012

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We developed a novel in-fiber magnetometer using microstructured optical fiber and ferrofluid. This device accurately measures magnetic fields, enabling directional flux measurements.

Area of Science:

Optofluidics
Magnetometry
Optical Fiber Sensing

Background:

Microstructured optical fibers (MOFs) offer unique light-matter interaction properties.
Ferrofluids exhibit tunable optical properties in response to magnetic fields.
Developing compact and sensitive magnetic field sensors is crucial for various applications.

Purpose of the Study:

To present a directional, in-fiber optofluidic magnetometer.
To demonstrate the principle of magnetic field sensing using a MOF Bragg grating infiltrated with ferrofluid.
To characterize the performance of the magnetometer in terms of sensitivity and range.

Main Methods:

Fabrication of a MOF Bragg grating infiltrated with a ferrofluidic defect.
Application of external magnetic fields to induce ferrofluid movement.

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Monitoring changes in the MOF Bragg grating's reflection spectrum.

Calibration of the sensor response against known magnetic field strengths.

Main Results:

The in-fiber magnetometer successfully detected magnetic fields.
The sensor demonstrated directional measurement capabilities.
The measurable magnetic field range was determined to be from 317 to 2500 Gauss (G).
The movement of the ferrofluid defect along the MOF Bragg grating directly correlated with the applied magnetic field.

Conclusions:

The presented optofluidic magnetometer offers a novel approach for directional magnetic field sensing.
The device leverages the unique properties of MOFs and ferrofluids for sensitive measurements.
This technology holds potential for applications requiring in-situ and directional magnetic field monitoring.