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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

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Magneto-optic coupling coefficient for fiber interferometric sensors.

J H Cole¹, N Lagakos, J Jarzynski

¹Naval Research Laboratory, Washington, DC 20375, USA.

|August 25, 2009

Summary

This study measured magneto-optic sensitivity in a fiber interferometer. The coupling coefficient remained flat until 600 Hz, when eddy currents impacted performance.

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Area of Science:

Physics
Materials Science
Optoelectronics

Background:

Magneto-optic effects are crucial for sensors and optical isolators.
Fiber interferometers offer high sensitivity for various measurements.
Magnetostrictive materials provide a pathway for magnetic field transduction.

Purpose of the Study:

To characterize the frequency response of magneto-optic sensitivity in a fiber interferometer.
To determine the operational frequency range of a nickel toroid-based system.
To identify limitations imposed by eddy-current losses.

Main Methods:

Utilized a fiber interferometer incorporating a magnetostrictive nickel toroid.
Measured magneto-optic sensitivity (coupling coefficient) as a function of frequency.
Swept frequencies from 15 Hz to 3 kHz.

Main Results:

The magneto-optic coupling coefficient exhibited a flat frequency response from 15 Hz up to approximately 600 Hz.
Significant eddy-current losses were observed above 600 Hz, affecting the nickel toroid's performance.
The system demonstrated stable sensitivity within a specific low-frequency range.

Conclusions:

The fiber interferometer with a nickel toroid is effective for low-frequency magneto-optic sensing.
Eddy-current losses limit the usable bandwidth of this configuration.
Further material optimization may extend the operational frequency range for such devices.