Masayuki Hoshina, Nobuhiko Yokoshi, Hiromi Okamoto, and Hajime Ishihara
Optical manipulation of nanoparticles (NPs) with nanoscale precision has been a goal of several research fields. One of the promising ways to realize this is the usage of localized surface plasmon (LSP). The electric field at hotspots near metallic structures is highly localized, which generates a sufficient force to trap NPs, and at the same time, the optical nonlinearity of NPs appears. In this Letter, we propose a scheme to super-resolutionally trap the NP into a particular hotspot of the metallic nanostructure array. The scheme is based on the optical nonlinearity of NPs, and utilizes two kinds of structured light: Gaussian and Laguerre-Gaussian beams. The results show the significant role of the optical nonlinearity in LSP trappings, and they are expected to open up new degrees of freedom to manipulate NPs.
DOI
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