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 nanoparticle dimers before and after surface-enhanced Raman scattering (SERS). We find that low-intensity (50 microW/microm2) 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.
Ringler
M
M
Photonics and Optoelectronics Group, Physics Department and CeNS, Ludwig-Maximilians-Universität München, Amalienstrasse 54, 80799 Munich, Germany.
Klar
T A
TA
Schwemer
A
A
Susha
A S
AS
Stehr
J
J
Raschke
G
G
Funk
S
S
Borowski
M
M
Nichtl
A
A
Kürzinger
K
K
Phillips
R T
RT
Feldmann
J
J
D003460:Crystallization / Q000379:methods; D004307:Dose-Response Relationship, Radiation; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008846:Micromanipulation / Q000379:methods*; D009038:Motion; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects* / Q000648:ultrastructure; D036103:Nanotechnology / Q000379:methods*; D052898:Optical Tweezers; D010316:Particle Size; D011829:Radiation Dosage; D013059:Spectrum Analysis, Raman / Q000379:methods*
D006046:Gold