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Nanoscale interference patterns of gap-mode multipolar plasmonic fields

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Title: Nanoscale interference patterns of gap-mode multipolar plasmonic fields
Authors: Tanaka, Yoshito Browse this author
Sanada, Akio Browse this author
Sasaki, Keiji Browse this author
Keywords: Nanoparticles
Optical materials and structures
Applied physics
Issue Date: 24-Oct-2012
Publisher: Nature Publishing Group
Journal Title: Scientific Reports
Volume: 2
Start Page: 764
Publisher DOI: 10.1038/srep00764
Abstract: Arbitrary spatial distributions of the electric field of light are formed through the interference of individual wavenumber mode fields with appropriate amplitudes and phases, while the maximum wavenumber in the far field is limited by the wavelength of light. In contrast, localized surface plasmons (LSPs) possess the ability to confine photons strongly into nanometer-scale areas, exceeding the diffraction limit. In particular, gap-mode LSPs produce single-nanometer-sized, highly intense localized fields, known as hot spots. Here, we show the nanoscale spatial profiles of the LSP fields within hot spots, which exhibit complicated fine structures, rather than single peaks. The nanopatterns are created by constructive and destructive interferences of dipolar, quadrupolar, and higher-order multipolar plasmonic modes, which can be drastically altered by controlling parameters of the excitation optical system. The analysis in this study would be useful for proposing new concepts for manipulation and control of light-matter interactions in nanospaces.
Type: article
URI: http://hdl.handle.net/2115/50795
Appears in Collections:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 笹木 敬司

 

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