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Proceedings Paper

Particle enhanced plasmonic NSOM
Author(s): Yuan Wang; Björn M. Reinhard; Cheng Sun; Xiang Zhang
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Paper Abstract

Nearfield scanning optical microscopy (NSOM) offers a practical means of optical imaging at a resolution well beyond the diffraction limit of the light. However, its applications are limited due to the strong attenuation of the light transmitted through the sub-wavelength aperture. In this paper, we report the development of particle enhanced plasmonic nearfield scanning optical microscope (PEP-NSOM) with a high optical coupling efficiency and a high spatial resolution. Two plasmonic components, a gold nanoparticle and a plasmonic lens, are integrated on a PEP-NSOM probe. By exciting both propagating surface plasmons and localized surface plasmons, PEP-NSOM probes are capable of focusing light onto the nanoparticle assembled on the aperture of the plasmonic lens, which can further squeeze the light to a few tens of nanometers. Nearfield intensity at the focus points of PEP-NSOM probes is 590 times higher than that of incident light according to numerical simulations. The E-field profile is also shown to be confined laterally <50nm at the imaging plane, which promises good nearfield images with high spatial resolution and low signal-noise ratio. Investigation indicates the local intensity enhancement can be further increased to be 4830 when using a gold nanodimer on the PEP-NSOM probe, which suggests the PEP-NSOM to be an open system of utilizing plasmonic nanostructures for nano-imaging. By providing a strong nano-scale light source, PEP-NSOM can be used as a high speed nano-scale imaging tool for single molecule detection and many other applications requiring high temporal/spatial resolution.

Paper Details

Date Published: 28 September 2007
PDF: 7 pages
Proc. SPIE 6642, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications III, 664208 (28 September 2007); doi: 10.1117/12.735466
Show Author Affiliations
Yuan Wang, Univ. of California, Berkeley (United States)
Björn M. Reinhard, Boston Univ. (United States)
Cheng Sun, Univ. of California, Berkeley (United States)
Xiang Zhang, Univ. of California, Berkeley (United States)

Published in SPIE Proceedings Vol. 6642:
Plasmonics: Nanoimaging, Nanofabrication, and Their Applications III
Satoshi Kawata; Vladimir M. Shalaev; Din-Ping Tsai, Editor(s)

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