Controlled nanoparticle arrays for transparent SERS/optical trapping substrates

Alma E. Wickenden; Troy A. Alexander D.D.S.

doi:10.1117/12.572453

19 January 2005 Controlled nanoparticle arrays for transparent SERS/optical trapping substrates

Alma E. Wickenden, Troy A. Alexander D.D.S.

Proceedings Volume 5592, Nanofabrication: Technologies, Devices, and Applications; (2005) https://doi.org/10.1117/12.572453
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States

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.

Citation Download Citation

Alma E. Wickenden and Troy A. Alexander D.D.S. "Controlled nanoparticle arrays for transparent SERS/optical trapping substrates", Proc. SPIE 5592, Nanofabrication: Technologies, Devices, and Applications, (19 January 2005); https://doi.org/10.1117/12.572453

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