Trapping and rotating nanoparticles using a plasmonic nano-tweezer with an integrated heat sink
Kai Wang, Ethan Schonbrun, Paul Steinvurzel, Kenneth B Crozier
Nature Communications | NATURE PUBLISHING GROUP | Published : 2011
Although optical tweezers based on far-fields have proven highly successful for manipulating objects larger than the wavelength of light, they face difficulties at the nanoscale because of the diffraction-limited focused spot size. This has motivated interest in trapping particles with plasmonic nanostructures, as they enable intense fields confined to sub-wavelength dimensions. A fundamental issue with plasmonics, however, is Ohmic loss, which results in the water, in which the trapping is performed, being heated and to thermal convection. Here we demonstrate the trapping and rotation of nanoparticles using a template-stripped plasmonic nanopillar incorporating a heat sink. Our simulations ..View full abstract
Awarded by Defense Advanced Research Projects Agency (DARPA)
Awarded by National Science Foundation (NSF)
Awarded by U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences
This work was supported in part by the Defense Advanced Research Projects Agency (DARPA) N/MEMS S&T Fundamentals program under grant no. N66001-10-1-4008 issued by the Space and Naval Warfare Systems Center Pacific (SPAWAR), in part by the National Science Foundation under grant no. ECCS-0747560 (CAREER award), and in part by the Center for Excitonics, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences under grant no. DE-SC0001088. Fabrication work was carried out in the Harvard Center for Nanoscale Systems, which is supported by the NSF. We thank Dr Nanfang Yu and Wenqi Zhu from Harvard University for the helpful discussions on device fabrication.