研究目的
Designing a magnetic field sensor based on magnetoplasmonic crystal to achieve high sensitivity and locality in detecting DC magnetic fields.
研究成果
The study demonstrates the feasibility of using magnetoplasmonic crystals as highly sensitive local sensors of DC magnetic fields, with a sensitivity of up to 3 · 10?6 Oe at a spot size of 1 mm2. The sensitivity can be tuned by varying the ferromagnetic layer thickness and further improved by optimizing the sensor's design.
研究不足
The study is limited by the need for further optimization of the sensing element and the sensor's setup design to achieve higher sensitivity and smaller spot sizes.
1：Experimental Design and Method Selection:
The study utilized magnetoplasmonic crystals made of noble and ferromagnetic metals deposited on one-dimensional subwavelength grating to enhance the transverse magneto-optical Kerr effect (TMOKE) through surface plasmon-polaritons excitation.
2：Sample Selection and Data Sources:
Four samples with varying thicknesses of iron layer were fabricated to study the contributions of magnetic and plasmonic properties to TMOKE enhancement.
3：List of Experimental Equipment and Materials:
Atomic force microscope (AFM), scanning electron microscope (SEM), vibrating sample magnetometer (VSM), halogen lamp with a monochromator, Glan-Taylor prism, photomultiplier tube (model H10722-20 by Hamamatsu), lock-in amplifier, optical chopper, and electromagnets.
4：Experimental Procedures and Operational Workflow:
The setup was optimized for TMOKE geometry measurements, with p-polarized light at a fixed incidence angle. The frequencies of optomechanical and AC magnetic field modulations were set to 233 and 317 Hz, respectively.
5：Data Analysis Methods:
The TMOKE value was defined and measured, and the signal-to-noise ratio (SNR) was calculated to assess the sensor's sensitivity.
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photmultiplier tube
H10722-20
Hamamatsu
Detection of reflected light intensity changes modulated by magnetic field.
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atomic force microscope
Examination of surface profile and deposited layer thickness.
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scanning electron microscope
Examination of surface profile and deposited layer thickness.
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vibrating sample magnetometer
Measurement of magnetic properties.
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halogen lamp with a monochromator
Light source for optical and magneto-optical properties study.
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Glan-Taylor prism
Polarizer for optical and magneto-optical properties study.
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lock-in amplifier
Detection of signal in optical and magneto-optical properties study.
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optical chopper
Control of frequency of optomechanical modulation.
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electromagnets
Control of magnitudes of AC and DC magnetic field.
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