研究目的
Investigating the transverse magneto-optical Kerr effect (TMOKE) in magnetite-based magnetoplasmonic crystals to understand the enhancement mechanisms and the role of optical resonances.
研究成果
The study demonstrates a multiple-wide-band enhancement of the TMOKE signal in magnetite-based magnetoplasmonic crystals, attributed to the hybridization of guided modes in the magnetite film and plasmonic modes of the gold grating. The TMOKE provides valuable information about optical resonances, with potential applications in optical isolation systems and sensors.
研究不足
The high absorption in magnetite leads to broad resonance peaks in the TMOKE spectra, which may limit the sharpness of resonance observations. The study focuses on specific structures, and the findings may not be directly applicable to other magnetoplasmonic systems.
1：Experimental Design and Method Selection:
The study involves analyzing angle-resolved TMOKE spectra from structures with noble metallic stripes incorporated inside or on top of magnetite films. The complex dielectric permittivity and gyration are determined using ellipsometry, Faraday rotation, and ellipticity measurements.
2：Sample Selection and Data Sources:
Two types of magnetite-based structures are used, with gold nanostripe arrays created by liftoff electron beam lithography.
3：List of Experimental Equipment and Materials:
Equipment includes a JSM 7001F electron microscope for SEM characterization, a spectrometer with a multichannel CCD detector for spectral measurements, and an electromagnet for applying external magnetic fields.
4：Experimental Procedures and Operational Workflow:
The TMOKE magnitude is measured as a function of the external magnetic field strength, with angle- and wavelength-resolved reflectivity and transmission spectra measured using a tungsten halogen lamp.
5：Data Analysis Methods:
The data are analyzed using rigorous coupled-wave analysis (RCWA) calculations to study optical resonances and compare with experimental results.
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