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Proceedings Paper

Nanopillars array for surface enhanced Raman scattering
Author(s): Allan S. P. Chang; Mihail Bora; Hoang T. Nguyen; Elaine M. Behymer; Cindy C. Larson; Jerald A. Britten; J. Chance Carter; Tiziana C. Bond
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Paper Abstract

We present a new class of surface-enhanced Raman scattering (SERS) substrates based on lithographically-defined two-dimensional rectangular array of nanopillars. Two types of nanopillars within this class are discussed: vertical pillars and tapered pillars. For the vertical pillars, the gap between each pair of nanopillars is small enough (< 50 nm) such that highly confined plasmonic cavity resonances are supported between the pillars when light is incident upon them, and the anti-nodes of these resonances act as three-dimensional hotspots for SERS. For the tapered pillars, SERS enhancement arises from the nanofocusing effect due to the sharp tip on top. SERS experiments were carried out on these substrates using various concentrations of 1,2 bis-(4-pyridyl)-ethylene (BPE), benzenethiol (BT) monolayer and toluene vapor. The results show that SERS enhancement factor of over 0.5 x 109 can be achieved, and BPE can be detected down to femto-molar concentration level. The results also show promising potential for the use of these substrates in environmental monitoring of gases and vapors such as volatile organic compounds.

Paper Details

Date Published: 26 May 2011
PDF: 8 pages
Proc. SPIE 8024, Advanced Environmental, Chemical, and Biological Sensing Technologies VIII, 80240I (26 May 2011); doi: 10.1117/12.884263
Show Author Affiliations
Allan S. P. Chang, Lawrence Livermore National Lab. (United States)
Mihail Bora, Lawrence Livermore National Lab. (United States)
Hoang T. Nguyen, Lawrence Livermore National Lab. (United States)
Elaine M. Behymer, Lawrence Livermore National Lab. (United States)
Cindy C. Larson, Lawrence Livermore National Lab. (United States)
Jerald A. Britten, Lawrence Livermore National Lab. (United States)
J. Chance Carter, Lawrence Livermore National Lab. (United States)
Tiziana C. Bond, Lawrence Livermore National Lab. (United States)


Published in SPIE Proceedings Vol. 8024:
Advanced Environmental, Chemical, and Biological Sensing Technologies VIII
Tuan Vo-Dinh; Robert A. Lieberman; Günter Gauglitz, Editor(s)

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