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Proceedings Paper

Surface plasmon resonance (SPR) in a chemically etched ZnSe substrate and its effect on the Raman signal enhancement
Author(s): Syed K. Islam; Maria Tamargo; Richard Moug; John R. Lombardi
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Paper Abstract

We report the observation of surface-enhanced Raman scattering (SERS) from a chemically etched ZnSe surface using 4-mercaptopyridine (4-MPy) as probe molecules. A thin film of ZnSe is grown by molecular beam epitaxy (MBE) and then etched using a strong acid. Protrusions of hemi-ellipsoidal nanoparticles are observed on the surface. Using the results of the Mie theory, we controlled the size of the nanoparticles to overlap significantly with maximum efficiency of near-field plasmon enhancement. In the Raman spectrum, we observe large enhancements of the a1, b1, and b2 modes when 4-MPy molecules are adsorbed on the surface using a 514.5 nm laser for excitation, indicating strong charge-transfer contributions. An enhancement factor of (2×106) is observed comparable to that of silver nanoparticles. We believe this large enhancement factor is an indication of the coupled contribution of several resonances. We propose that some combination of surface plasmon, charge transfer, band gap resonances are most likely the contributing factors in the observed Raman signal enhancement, since all three of these resonances lie close to the excitation wavelength.

Paper Details

Date Published: 13 May 2015
PDF: 10 pages
Proc. SPIE 9481, Image Sensing Technologies: Materials, Devices, Systems, and Applications II, 94810S (13 May 2015); doi: 10.1117/12.2182968
Show Author Affiliations
Syed K. Islam, The City College of New York (United States)
Maria Tamargo, The City College of New York (United States)
Richard Moug, The City College of New York (United States)
John R. Lombardi, The City College of New York (United States)


Published in SPIE Proceedings Vol. 9481:
Image Sensing Technologies: Materials, Devices, Systems, and Applications II
Nibir K. Dhar; Achyut K. Dutta, Editor(s)

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