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

Partha Pratim Patra, Rohit Chikkaraddy, Ravi P. N. Tripathi, Arindam Dasgupta and G. V. Pavan Kumar ()
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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

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms5357

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