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Accession Number ADA564666
Title SERS Engineering Collaboration.
Publication Date Jun 2012
Media Count 9p
Personal Author D. Wang K. B. Crozier M. Banaee W. Zhu Y. Chu
Abstract We performed research on the design and realization of high performance substrates for surface enhanced Raman scattering (SERS), and elucidated the role of chemical interactions between analyte molecules and a plasmonic substrate, the so-called 'chemical effect.' Two approaches were taken for the realization of high performance SERS substrates. In the first, metal nanostructures supporting surface plasmons were fabricated by electron beam lithography. We demonstrated that by optimizing the design of metallic nanostructures, the average enhancement factor (EF) for surface-enhanced Raman scattering (SERS) could be as large as 8.4x10(caret)8. The angular dependencies of the local field enhancement and the Raman emission enhancement were also investigated. We demonstrated that a stronger SERS signal resulted when the plasmonic substrate was illuminated with a collimated, rather than focused, laser beam. In the second approach, a pulsed laser was used to texture a silicon wafer to form sharp features. Silver was evaporated onto the wafer, and the resulting structures were found to exhibit very high SERS performance. In the theory effort, a comprehensive analysis of the chemical effect, including analytical and computational modeling, was accomplished.
Keywords Chemical reactions
Electron beam lithography
Laser beams
Mathematical models
Pulsed lasers
Raman scattering
Raman spectra
Surface enhanced raman scattering

Source Agency Non Paid ADAS
NTIS Subject Category 99F - Physical & Theoretical Chemistry
46H - Radiofrequency Waves
Corporate Author Harvard Univ., Boston, MA.
Document Type Technical report
Title Note Final rept. 1 May 2008-14 Feb 2012.
NTIS Issue Number 1303
Contract Number FA9550-08-1-0285

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