Raman Enhancement Factor of a Single Tunable Nanoplasmonic Resonator

Su, Kai-Hung and Durant, Stéphane and Steele, Jennifer M. and Xiong, Yi and Sun, Cheng and Zhang, Xiang. (2006) Raman Enhancement Factor of a Single Tunable Nanoplasmonic Resonator. The Journal of Physical Chemistry B, 110 (9). pp. 3964-3968. ISSN 1520-6106

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Abstract

We have developed a novel technique to precisely determine the Raman enhancement factor in single nanoplasmonic resonators (TNPRs). TNPRs are lithographically defined metallodielectric nanoparticles composed of two silver disks stacked vertically, separated by a silica layer. At resonance, the local electromagnetic fields are enhanced at the TNPR surface, making it an ideal surface-enhanced Raman scattering (SERS) active substrate. The ability to control the dimensions of the metallic and dielectric layers offers the unique advantage of fine-tuning the plasmon resonance frequency to maximize the enhancement of the Raman signal. Furthermore, by selective shielding of the outer surface of the metallic structure, the efficiency can be further enhanced by guiding the molecular assembly to the locations that exhibit strong electromagnetic fields. We experimentally demonstrate SERS enhancement factors of (6.1 ± 0.3) × 1010, with the highest enhancement factor being achieved by using an individual nanoparticle. By using nanofabrication techniques, we eliminate the issues such as large size variations, cluster aggregation, and interparticle effects common in preparing SERS substrates using conventional chemical synthesis or batch fabrication methods. TNPRs produce very controllable and repeatable SERS signals at the desired locations and, thus, make an ideal candidate for device integration.

Item Type: Article
Additional Information: Reprinted with permission from "Raman Enhancement Factor of a Single Tunable Nanoplasmonic Resonator", Su KH et al., J. Phys. Chem. B, 2006, 110 (9), pp 3964–3968. Copyright 2006 American Chemical Society.
Uncontrolled Keywords: Plasmon resonance
InterNano Taxonomy: Nanoscale Objects and Nanostructured Materials > Nanoparticles
Nanomanufacturing Characterization Techniques > Diffraction and Scattering
Collections: Nanomanufacturing Research Collection
Depositing User: Moureen Kemei
Date Deposited: 24 Mar 2010 19:40
Last Modified: 24 Mar 2010 19:40
URI: http://eprints.internano.org/id/eprint/359

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