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Title: Optically assisted trapping with high-permittivity dielectric rings: Towards optical aerosol filtration

Controlling the transport, trapping, and filtering of nanoparticles is important for many applications. By virtue of their weak response to gravity and their thermal motion, various physical mechanisms can be exploited for such operations on nanoparticles. However, the manipulation based on optical forces is potentially most appealing since it constitutes a highly deterministic approach. Plasmonic nanostructures have been suggested for this purpose, but they possess the disadvantages of locally generating heat and trapping the nanoparticles directly on the surface. Here, we propose the use of dielectric rings made of high permittivity materials for trapping nanoparticles. Thanks to their ability to strongly localize the field in space, nanoparticles can be trapped without contact. We use a semianalytical method to study the ability of these rings to trap nanoparticles. Lastly, the results are supported by full-wave simulations and application of the trapping concept to nanoparticle filtration is suggested.
 [1] ;  [2] ;  [3] ;  [4]
  1. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Theoretical Solid State Physics; Max Planck Inst. for the Science of Light, Erlangen (Germany)
  2. Karlsruhe Inst. of Technology (Germany) Inst. of Applied Physics; Institut FEMTO-ST, Univ. de Bourgogne Franche-Comte (France). National Center for Scientific Research (CNRS)
  3. Karlsruhe Inst. of Technology (KIT) (Germany). Inst. of Theoretical Solid State Physics; Karlsruhe Inst. of Technology, (Germany). Inst. of Nanotechnology
  4. Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6123, USA; Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996-1200, USA
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 14; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1420532