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Proceedings Paper

Surface-plasmon-based optical trapping of hard nanoparticles: two-dimensional closely packed assembly of polystyrene nanospheres on a metallic nanostructure
Author(s): Tatsuya Shoji; Hajime Ishihara; Yasuyuki Tsuboi
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Paper Abstract

Localized surface plasmons (LSPs) have been investigated for applications such as highly sensitive spectroscopies and the enhancement of photochemical reactions. These applications are enabled by the enhancement effect of an incident resonant electromagnetic field (EMF) at the surfaces of noble metallic nanostructures. In particular, the application of LSP has recently attracted much attention for achieving the effective optical trapping of nanoparticles; this is called LSPbased optical trapping (LSP-OT). LSP-OT possesses several advantages; (i) the EMF enhancement effect of LSP enables the incident light intensity to be significantly reduced for stable LSP-OT, (ii) a nano-sized object can be trapped in a nano-space whose volume is much smaller than that of conventional optical tweezers (diffraction limit), (iii) a large and complicated optical set-up is not necessary, and (iv) this technique can potentially be combined with microfluidic devices. That is, plasmonic substrates can work as “double-functional” devices where biomolecules trapped by LSPOT can subsequently be analyzed on the basis of SERS or fluorescence enhancement. Thus, LSP-OT could enable a new technique for manipulating not only nanoparticles, but also smaller molecules such as polymer chains, proteins and DNA. Here, we will present the demonstration of LSP-OT of fluorescent-labeled polystyrene nanospheres. We discuss multiple optical trapping in which a closely packed 2D hexagonal assembly appeared on a metallic nanostructure.

Paper Details

Date Published: 12 September 2013
PDF: 6 pages
Proc. SPIE 8810, Optical Trapping and Optical Micromanipulation X, 88102M (12 September 2013); doi: 10.1117/12.2022968
Show Author Affiliations
Tatsuya Shoji, Hokkaido Univ. (Japan)
Hajime Ishihara, Osaka Prefecture Univ. (Japan)
Yasuyuki Tsuboi, Hokkaido Univ. (Japan)
Japan Science and Technology Cooperation (Japan)

Published in SPIE Proceedings Vol. 8810:
Optical Trapping and Optical Micromanipulation X
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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