期刊
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
卷 211, 期 5, 页码 1067-1075出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssa.201300701
关键词
localized plasmon resonances; magneto-optical Kerr effect; magnetoplasmonics; polarizability
资金
- Basque Government [PI2012-47]
- Catalan Government [2009-SGR-1292]
- Spanish Ministry of Economy and Competitiveness [MAT2012-36844, MAT2010-20616-C02]
- Knut and Alice Wallenberg Foundation
- Swedish Research Council (VR)
- Swedish Foundation for Strategic Research, SSF [RMA08]
- National Doctoral Programme in Nanoscience
- Academy of Finland [263510]
- Academy of Finland (AKA) [263510, 263510] Funding Source: Academy of Finland (AKA)
Magnetoplasmonics is an emerging field of intense research on materials combining magnetic and plasmonic functionalities. The novel optical and magneto-optical (MO) properties displayed by these materials could allow the design of a new class of magnetically controllable optical nano-devices. In this work, we investigate the effects of a non-absorbing (insulating) substrate on the MO activity of pure ferromagnetic disk-shaped nanostructures supporting localized plasmon resonances. We show that the red-shift of the localized plasmon resonance, related to the modification of the localization of the electromagnetic field due to the substrate, is not the only effect that the substrate has on the MO response. We demonstrate that the reflectivity of the substrate itself plays a key role in determining the MO response of the system. We discuss why it is so and provide a description of the modeling tools suitable to take into account both effects. Understanding the role of the substrate will permit a more aware design of magnetoplasmonic nanostructured devices for future biotechnological and optoelectronic applications. [GRAPHICS] Ferromagnetic nickel nanodisk in vacuum (left) and on a non-absorbing substrate (right), illuminated by linearly polarized light. The polarization of the reflected field is changed in the first case due to a combination of intrinsic magneto-optical properties and the nanoconfinement of the material. In the second case, the polarization of the reflected light is affected also by the presence of the substrate. (C) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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