期刊
ACS APPLIED NANO MATERIALS
卷 4, 期 2, 页码 1057-1066出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c02588
关键词
magnetoplasmonics; gold@iron oxide core-shell; nanoheterostructures; magnetic circular dichroism; plasmonics; active plasmonics
资金
- H2020-FETOPEN-2016-2017 Grant [737709 FEMTOTERA-BYTE]
- Universita di Pisa [PRA_2017_25]
- Universita di Pisa
Magnetoplasmonics, which modulates plasmon resonance with an external magnetic field, is a promising approach for enhancing the sensitivity of plasmon-based refractometric sensing. The use of hybrid nanostructures made of core@shell materials can significantly improve the magnetoplasmonic response of noble metals in localized surface plasmon regions.
Plasmon resonance modulation with an external magnetic field (magnetoplasmonics) represents a promising route for the improvement of the sensitivity of plasmon-based refractometric sensing. To this purpose, an accurate material choice is needed to realize hybrid nanostructures with an improved magnetoplasmonic response. In this work, we prepared core@shell nanostructures made of an 8 nm Au core surrounded by an ultrathin iron oxide shell (<= 1 nm). The presence of the iron oxide shell was found to significantly enhance the magneto-optical response of the noble metal in the localized surface plasmon region, compared with uncoated Au nanoparticles. With the support of an analytical model, we ascribed the origin of the enhancement to the shell-induced increase in the dielectric permittivity around the Au core. The experiment points out the importance of the spectral position of the plasmonic resonance in determining the magnitude of the magnetoplasmonic response. Moreover, the analytical model proposed here represents a powerful predictive tool for the quantification of the magnetoplasmonic effect based on resonance position engineering, which has significant implications for the design of active magnetoplasmonic devices.
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