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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 6 — May. 25, 2012

Plasmonic nanotweezers: strong influence of adhesion layer and nanostructure orientation on trapping performance

Brian J. Roxworthy and Kimani C. Toussaint, Jr.  »View Author Affiliations


Optics Express, Vol. 20, Issue 9, pp. 9591-9603 (2012)
http://dx.doi.org/10.1364/OE.20.009591


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Abstract

Using Au bowtie nanoantennas arrays (BNAs), we demonstrate that the performance and capability of plasmonic nanotweezers is strongly influenced by both the material comprising the thin adhesion layer used to fix Au to a glass substrate and the nanostructure orientation with respect to incident illumination. We find that a Ti adhesion layer provides up to 30% larger trap stiffness and efficiency compared to a Cr layer of equal thickness. Orientation causes the BNAs to operate as either (1) a 2D optical trap capable of efficient trapping and manipulation of particles as small as 300 nm in diameter, or (2) a quasi-3D trap, with the additional capacity for size-dependent particle sorting utilizing axial Rayleigh-Bénard convection currents caused by heat generation. We show that heat generation is not necessarily deleterious to plasmonic nanotweezers and achieve dexterous manipulation of nanoparticles with non-resonant illumination of BNAs.

© 2012 OSA

OCIS Codes
(350.4855) Other areas of optics : Optical tweezers or optical manipulation
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optical Trapping and Manipulation

History
Original Manuscript: March 15, 2012
Revised Manuscript: April 2, 2012
Manuscript Accepted: April 3, 2012
Published: April 11, 2012

Virtual Issues
Vol. 7, Iss. 6 Virtual Journal for Biomedical Optics

Citation
Brian J. Roxworthy and Kimani C. Toussaint, "Plasmonic nanotweezers: strong influence of adhesion layer and nanostructure orientation on trapping performance," Opt. Express 20, 9591-9603 (2012)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-20-9-9591


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