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Issue 30, 2017
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Dynamic plasmonic nano-traps for single molecule surface-enhanced Raman scattering

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Abstract

Intense electric fields at the nanoscale are essential for single molecule surface-enhanced Raman scattering (SERS) detection. Such fields can be achieved in plasmonic nano-gaps between nanoparticles and metal films through hybridization of surface plasmons. The nano-gaps could be formed and dynamically controlled by using plasmonic tweezers; however, the aggregation of particles in the plasmonic field degrades each particle's enhancement and spoils the nanosized-spatial resolution. Here, dual-plasmonic tweezers are proposed and demonstrated to accurately control the number of nano-gaps and enhancement by tailoring a crater-shaped potential well in the nano-trap system. As the electric field in the nano-gap is intense, SERS spectral signatures of a single molecular level are probed simultaneously. These advantages point towards the implementation of enhanced Raman spectra, and broad applications in optical molecular detection.

Graphical abstract: Dynamic plasmonic nano-traps for single molecule surface-enhanced Raman scattering

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Article information


Submitted
05 Apr 2017
Accepted
13 Jun 2017
First published
14 Jun 2017

Nanoscale, 2017,9, 10694-10700
Article type
Paper

Dynamic plasmonic nano-traps for single molecule surface-enhanced Raman scattering

Y. Zhang, J. Shen, Z. Xie, X. Dou, C. Min, T. Lei, J. Liu, S. Zhu and X. Yuan, Nanoscale, 2017, 9, 10694
DOI: 10.1039/C7NR02406A

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