Journal
OPTICS EXPRESS
Volume 20, Issue 9, Pages -Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.009591
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Funding
- National Science Foundation (NSF) [ECCS 10-25868]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1028568] Funding Source: National Science Foundation
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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-Benard 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. (c) 2012 Optical Society of America
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