Abstract
Here we report on designing a magnetic field sensor based on magnetoplasmonic crystal made of noble and ferromagnetic metals deposited on one-dimensional subwavelength grating. The experimental data demonstrate resonant transverse magneto-optical Kerr effect (TMOKE) at a narrow spectral region of 50 nm corresponding to the surface plasmon-polaritons excitation and maximum modulation of the reflected light intensity of 4.5% in a modulating magnetic field with the magnitude of 16 Oe. Dependences of TMOKE on external alternating current (AC) and direct current (DC) magnetic field demonstrate that it is a possibility to use the magnetoplasmonic crystal as a high-sensitive sensing probe. The achieved sensitivity to DC magnetic field is up to 10−6 Oe at local area of 1 mm2.
Highlights
We report on designing a magnetic field sensor based on magnetoplasmonic crystal made of noble and ferromagnetic metals deposited on one-dimensional subwavelength grating
Surface of magnetoplasmonic crystals was passivated by a thin transparent layer of dielectric to prevent oxidation of the iron layer
Thicknesses of functional layers were varied to estimate the contributions of magnetic and plasmonic properties into the enhancement of transverse magneto-optical Kerr effect (TMOKE) and sensitivity of direct current (DC) magnetic field sensor based on MPlCs
Summary
We report on designing a magnetic field sensor based on magnetoplasmonic crystal made of noble and ferromagnetic metals deposited on one-dimensional subwavelength grating. Magneto-optical effects can be enhanced by SPPs in magnetoplasmonic crystals fabricated of noble metal and magnetic layers with one- or two-dimensional subwavelength grating[20,24,25,26,27].
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