Journal article

Direct Particle Tracking Observation and Brownian Dynamics Simulations of a Single Nanoparticle Optically Trapped by a Plasmonic Nanoaperture

Zhe Xu, Wuzhou Song, Kenneth B Crozier



Optical trapping using plasmonic nanoapertures has proven to be an effective means for the contactless manipulation of nanometer-sized particles under low optical intensities. These particles have included polystyrene and silica nanospheres, proteins, coated quantum dots and magnetic nanoparticles. Here we employ fluorescence microscopy to directly observe the optical trapping process, tracking the position of a polystyrene nanosphere (20 nm diameter) trapped in water by a double nanohole (DNH) aperture in a gold film. We show that position distribution in the plane of the film has an elliptical shape. Comprehensive simulations are performed to gain insight into the trapping process, includi..

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University of Melbourne Researchers


Awarded by Australian Research Council

Funding Acknowledgements

This research was sponsored in part by the Australian Research Council (DP150103736 and FT140100577), by the Victorian Endowment for Science, Knowledge and Innovation (VESKI), and by the Laby Foundation. This work was performed in part at the Melbourne Centre for Nanofabrication (MCN) in the Victorian Node of the Australian National Fabrication Facility (ANFF).