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

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Published on: November 21, 2019

Magnetic field sensor based on magnetoplasmonic crystal.

Victor K Belyaev¹, Valeria V Rodionova², Andrey A Grunin³

¹Institute of Physics, Mathematics and Informational Technologies, Immanuel Kant Baltic Federal University, Kaliningrad, 236041, Russia. belyaev@lnmm.ru.

Scientific Reports

|April 30, 2020

Summary

This study presents a novel magnetic field sensor utilizing a magnetoplasmonic crystal. The sensor achieves high sensitivity for detecting magnetic fields, showing potential for advanced sensing applications.

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Area of Science:

Condensed matter physics
Nanotechnology
Optoelectronics

Background:

Magnetoplasmonic crystals offer unique optical and magnetic properties.
Subwavelength gratings enable precise control over light-matter interactions.

Purpose of the Study:

To design and demonstrate a highly sensitive magnetic field sensor.
To investigate the magnetoplasmonic properties of noble and ferromagnetic metals on gratings.

Main Methods:

Fabrication of a magnetoplasmonic crystal on a 1D subwavelength grating.
Characterization of the transverse magneto-optical Kerr effect (TMOKE).
Measurement of TMOKE response to varying AC and DC magnetic fields.

Main Results:

Observed resonant TMOKE in a narrow spectral region (50 nm) linked to surface plasmon-polariton excitation.
Achieved a maximum reflected light intensity modulation of 4.5% with a 16 Oe magnetic field.
Demonstrated high sensitivity to DC magnetic fields up to 10^-6 Oe over a 1 mm² area.

Conclusions:

The developed magnetoplasmonic crystal sensor exhibits high sensitivity and potential for practical applications.
The resonant TMOKE phenomenon is key to the sensor's performance.
This technology can be utilized as a sensitive probe for magnetic field detection.