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Proceedings Paper

Controlled nanoparticle arrays for transparent SERS/optical trapping substrates
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Paper Abstract

Electron beam lithography has been used to demonstrate square and hexagonal close packed two-dimensional arrays of gold particles formed on transparent substrates for Surface Enhanced Raman Scattering (SERS) spectroscopic analysis of optically trapped single spore biological agents. Thin chromium or titanium films have been demonstrated to provide a sufficiently reflective surface to enable the controllable patterning of features as small as 30nm, or inter-particle spacings as small as 50nm, while retaining transmission in the visible to infrared spectral region. These substrates have been successfully used in a SERS/optical tweezer configuration, in which polystyrene particles and pyridine molecules in aqueous solution have been trapped, and their SERS-active spectra demonstrated. The technique described in this work for nanoscale features patterned on transparent substrates holds promise for inexpensive, nanotechnology-enabled chemical/biological sensor applications.

Paper Details

Date Published: 19 January 2005
PDF: 8 pages
Proc. SPIE 5592, Nanofabrication: Technologies, Devices, and Applications, (19 January 2005); doi: 10.1117/12.572453
Show Author Affiliations
Alma E. Wickenden, Army Research Lab. (United States)
Troy A. Alexander D.D.S., Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 5592:
Nanofabrication: Technologies, Devices, and Applications
Warren Y-C. Lai; Stanley Pau; O. Daniel Lopez, Editor(s)

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