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Probing the electromagnetic field distribution within a metallic nanodisk
David Meneses-Rodríguez1, Elías Ferreiro-Vila, Patricia Prieto
1IMM-Instituto de Microelectrónica de Madrid (CNM-CSIC), Isaac Newton 8, PTM, E-28760 Tres Cantos. Madrid, Spain.
Small (Weinheim an Der Bergstrasse, Germany)
|October 6, 2011
Summary
A cobalt nanolayer probes electromagnetic field distribution in metallic nanodisks. The field is strongest at the top and bottom surfaces, and weakest in the center, under plasmon resonance.
Area of Science:
- Nanophotonics
- Plasmonics
- Magneto-optics
Background:
- Metallic nanostructures exhibit unique optical properties due to surface plasmon resonance.
- Understanding electromagnetic field distribution within these structures is crucial for device applications.
- Local probing techniques are needed to resolve field inhomogeneities.
Purpose of the Study:
- To investigate the vertical distribution of the electromagnetic field within a metallic nanodisk.
- To utilize a cobalt (Co) nanolayer as a local probe for electromagnetic field intensity.
- To correlate magneto-optical activity with electromagnetic field intensity.
Main Methods:
- Fabrication of a metallic nanodisk with an embedded Co nanolayer.
- Excitation of plasmon resonance in the nanodisk.
- Measurement of magneto-optical activity of the Co layer.
- Analysis of the relationship between magneto-optical signals and local electromagnetic field intensity.
Main Results:
- The electromagnetic field distribution within the nanodisk is vertically inhomogeneous.
- Maximum electromagnetic field intensities are observed near the upper and lower flat faces of the nanodisk.
- A minimum electromagnetic field intensity is found at the center of the nanodisk.
Conclusions:
- Cobalt nanolayers effectively probe local electromagnetic fields in plasmonic nanostructures.
- Plasmon resonance leads to a non-uniform electromagnetic field distribution within metallic nanodisks.
- The vertical field profile shows distinct maxima at the surfaces and a minimum in the core.
