Magnetoplasmonic Resonators Designed with Hexagonally Arrayed Au/BIG Bilayer Nanodisks on Au Thin Film Layers for Enhanced MOKE and Refractive Index Sensing
Source abstract
Abstract
A kind of magnetoplasmonic resonators is numerically designed with hexagonally arrayed Au/bismuth iron garnet (BIG) bilayer nanodiscks on Au thin film layers. Multi-physics coupling calculation on their magnetoplasmonic resonance features suggest that there exists a strong resonant coupling between the surface plasmon excited by the hexagonal grating and the waveguide modes induced by Au-BIG-Au, which can significantly enhance the transverse magneto-optical Kerr effect. Interestingly, a new type of circular oscillating can be induced in the optical-transparent BIG layers as the thickness of BIG layers is between 2 nm and 22 nm. This circular oscillating exhibits a distinct thickness-dependent feature, which can be attributed to the near field interference of the excited localized plasmon resonance between the two interfaces formed by the middle BIG nanodiscs in the top Au nanodisks and the bottom Au thin film layers according to the simulation. These unique magnetoplasmonic features endow this kind of magnetoplasmonic resonators with a greatly enhanced refractive index sensing property, with a calculated figure of merit (FOM) value of up to 7527 RIU−1.
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Research context
OpenAlex topics: Plasmonic and Surface Plasmon Research · Magnetic properties of thin films · Magneto-Optical Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Modern Physics Technology, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China
Key Laboratory of Pulsed Power Translational Medicine of Zhejiang Province, Hangzhou Ruidi Biotechnology Company Ltd., Room 803, Bldg. 4, 4959 Yuhangtang Road, Cangqian Street, Hangzhou 310023, China
Zhengzhou Tianzhao Biomedical Technology Company, Ltd., 7 Dongqing Street, Zhengzhou High Tech Development Zone, Zhengzhou 451450, China
Funding
National Natural Science Foundation of China · BRICS STI Framework Program by NSFC · National S&T Major Project of China · development of a highly sensitive magneto-optical biomolecular sensor experimental prototype · Zhejiang Key Laboratory for Pulsed Power Translational Medicine through Hangzhou Ruidi Biotechnology Co., Ltd. · Zhengzhou Tianzhao Biomedical Technology Co. Ltd.
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