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

Abstract

Intense electric fields at nanoscale are essential for single molecule surface-enhanced Raman scattering (SERS) detection. Such fields can be achieved in plasmonic nano-gaps between nanoparticle and metal film through hybridization of surface plasmons. The nano-gaps could be formed and dynamically controlled by 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.

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Publication details

The article was received on 05 Apr 2017, accepted on 13 Jun 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C7NR02406A
Citation: Nanoscale, 2017, Accepted Manuscript
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    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, Accepted Manuscript , DOI: 10.1039/C7NR02406A

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