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Pushing nanoparticles with light — A femtonewton resolved measurement of optical scattering forces
M. R. Pollard, S. W. Botchway, B. Chichkov, E. Freeman, R. N. J. Halsall, D. W. K. Jenkins, I. Loader, A. Ovsianikov, A. W. Parker, R. Stevens et al., New J. Phys. 12, 113056 (2010).
See supplementary material at http://dx.doi.org/10.1063/1.4945351
for a derivation of Equation(3)
, the results of optical heating simulations for the particle surface temperature, and details on the error bar calculation for Figure4
and the theoretical scattering force calculation.[Supplementary Material]
M. Toshimitsu, Y. Matsumura, T. Shoji, N. Kitamura, M. Takase, K. Murakoshi, H. Yamauchi, S. Ito, H. Miyasaka, A. Nobuhiro et al., J. Phys. Chem. C 116, 14610 (2012).
M. Perner, P. Bost, U. Lemmer, G. von Plessen, J. Feldmann, U. Becker, M. Mennig, M. Schmitt, and H. Schmidt, Phys. Rev. Lett. 78, 2192 (1997).
Optomechanical manipulation of plasmonic
nanoparticles is an area of current interest, both fundamental and applied. However, no experimental method is available to determine the forward-directed scattering force that dominates for incident light of a wavelength close to the plasmon resonance. Here, we demonstrate how the scattering force acting on a single gold
nanoparticle in solution can be measured. An optically trapped 80 nm particle was repetitively pushed from the side with laser light resonant to the particle plasmon frequency. A lock-in analysis of the particle movement provides a measured value for the scattering force. We obtain a resolution of less than 3 femtonewtons which is an order of magnitude smaller than any measurement of switchable forces performed on nanoparticles in solution with single beam optical tweezers to date. We compared the results of the force measurement with Mie simulations of the optical scattering force on a gold
nanoparticle and found good agreement between experiment and theory within a few fN.
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