Optically and elastically assembled plasmonic nanoantennae for spatially resolved characterization of chemical composition in soft matter systems using surface enhanced spontaneous and stimulated Raman scattering

We present a method to locally probe spatially varying chemical composition of soft matter systems by use of optically controlled and elastically self-assembled plasmonic nanoantennae. Disc-shaped metal particles with sharp irregular edges are optically trapped, manipulated, and assembled into small...

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Veröffentlicht in:Journal of Applied Physics 2014-08, Vol.116 (6)
Hauptverfasser: Mundoor, Haridas, Lee, Taewoo, Gann, Derek G., Ackerman, Paul J., Senyuk, Bohdan, van de Lagemaat, Jao, Smalyukh, Ivan I.
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container_issue 6
container_start_page
container_title Journal of Applied Physics
container_volume 116
creator Mundoor, Haridas
Lee, Taewoo
Gann, Derek G.
Ackerman, Paul J.
Senyuk, Bohdan
van de Lagemaat, Jao
Smalyukh, Ivan I.
description We present a method to locally probe spatially varying chemical composition of soft matter systems by use of optically controlled and elastically self-assembled plasmonic nanoantennae. Disc-shaped metal particles with sharp irregular edges are optically trapped, manipulated, and assembled into small clusters to provide a strong enhancement of the Raman scattering signal coming from the sample regions around and in-between these particles. As the particles are reassembled and spatially translated by computer-controlled laser tweezers, we probe chemical composition as a function of spatial coordinates. This allows us to reliably detect tiny quantities of organic molecules, such as capping ligands present on various nanoparticles, as well as to probe chemical composition of the interior of liquid crystal defect cores that can be filled with, for example, polymer chains. The strong electromagnetic field enhancement of optically manipulated nanoparticles' rough surfaces is demonstrated in different forms of spectroscopy and microscopy, including enhanced spontaneous Raman scattering, coherent anti-Stokes Raman scattering, and stimulated Raman scattering imaging modes.
doi_str_mv 10.1063/1.4892932
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Applied physics
Chemical and Material Sciences
Chemical composition
Coherent scattering
Crystal defects
Electromagnetic fields
Liquid crystals
MATERIALS SCIENCE
Metal particles
Nanoparticles
NANOSCIENCE AND NANOTECHNOLOGY
Organic chemistry
Raman spectra
Self-assembly
title Optically and elastically assembled plasmonic nanoantennae for spatially resolved characterization of chemical composition in soft matter systems using surface enhanced spontaneous and stimulated Raman scattering
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