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Plasmofluidic single-molecule surface-enhanced Raman scattering from dynamic assembly of plasmonic nanoparticles

Author

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  • Partha Pratim Patra

    (Photonics and Optical Nanoscopy Laboratory, h-cross, Indian Institute of Science Education and Research)

  • Rohit Chikkaraddy

    (Photonics and Optical Nanoscopy Laboratory, h-cross, Indian Institute of Science Education and Research)

  • Ravi P. N. Tripathi

    (Photonics and Optical Nanoscopy Laboratory, h-cross, Indian Institute of Science Education and Research)

  • Arindam Dasgupta

    (Photonics and Optical Nanoscopy Laboratory, h-cross, Indian Institute of Science Education and Research)

  • G. V. Pavan Kumar

    (Photonics and Optical Nanoscopy Laboratory, h-cross, Indian Institute of Science Education and Research)

Abstract

Single-molecule surface-enhanced Raman scattering (SM-SERS) is one of the vital applications of plasmonic nanoparticles. The SM-SERS sensitivity critically depends on plasmonic hot-spots created at the vicinity of such nanoparticles. In conventional fluid-phase SM-SERS experiments, plasmonic hot-spots are facilitated by chemical aggregation of nanoparticles. Such aggregation is usually irreversible, and hence, nanoparticles cannot be re-dispersed in the fluid for further use. Here, we show how to combine SM-SERS with plasmon polariton-assisted, reversible assembly of plasmonic nanoparticles at an unstructured metal–fluid interface. One of the unique features of our method is that we use a single evanescent-wave optical excitation for nanoparticle assembly, manipulation and SM-SERS measurements. Furthermore, by utilizing dual excitation of plasmons at metal–fluid interface, we create interacting assemblies of metal nanoparticles, which may be further harnessed in dynamic lithography of dispersed nanostructures. Our work will have implications in realizing optically addressable, plasmofluidic, single-molecule detection platforms.

Suggested Citation

  • Partha Pratim Patra & Rohit Chikkaraddy & Ravi P. N. Tripathi & Arindam Dasgupta & G. V. Pavan Kumar, 2014. "Plasmofluidic single-molecule surface-enhanced Raman scattering from dynamic assembly of plasmonic nanoparticles," Nature Communications, Nature, vol. 5(1), pages 1-8, September.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms5357
    DOI: 10.1038/ncomms5357
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    Cited by:

    1. Xueyan Chen & Qianqian Ding & Chao Bi & Jian Ruan & Shikuan Yang, 2022. "Lossless enrichment of trace analytes in levitating droplets for multiphase and multiplex detection," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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