Moving Nanoparticles with Raman Scattering

We show how to change optically the distance between two protein-linked gold nanoparticles by Raman-induced motion of the linker protein. Rayleigh scattering spectroscopy of the coupled-particle plasmon allows us to compare the inter-nanoparticle distance of individual protein-linked gold nanopartic...

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Veröffentlicht in:	Nano letters 2007-09, Vol.7 (9), p.2753-2757
Hauptverfasser:	Ringler, M, Klar, T. A, Schwemer, A, Susha, A. S, Stehr, J, Raschke, G, Funk, S, Borowski, M, Nichtl, A, Kürzinger, K, Phillips, R. T, Feldmann, J
Format:	Artikel
Sprache:	eng
Schlagworte:	Collective excitations (including excitons, polarons, plasmons and other charge-density excitations) Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science rheology Crystallization - methods Dose-Response Relationship, Radiation Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Exact sciences and technology Gold - chemistry Gold - radiation effects Light Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Materials science Micromanipulation - methods Motion Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Nanostructures - chemistry Nanostructures - radiation effects Nanostructures - ultrastructure Nanotechnology - methods Optical Tweezers Particle Size Physics Radiation Dosage Spectrum Analysis, Raman - methods Surface and interface electron states Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties)
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Beschreibung
Zusammenfassung:	We show how to change optically the distance between two protein-linked gold nanoparticles by Raman-induced motion of the linker protein. Rayleigh scattering spectroscopy of the coupled-particle plasmon allows us to compare the inter-nanoparticle distance of individual protein-linked gold nanoparticle dimers before and after surface-enhanced Raman scattering (SERS). We find that low-intensity (50 μW/μm2) laser light in resonance with the nanoparticle-dimer plasmon provokes a change of the inter-nanoparticle distance on the order of 0.5 nm whenever SERS from the proteins connecting the nanoparticles can be observed.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl0712466