Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 63: Plasmonics and Nanooptics V
O 63.2: Vortrag
Donnerstag, 14. März 2013, 10:45–11:00, H38
Arrays of plasmonic particles for optical trapping — •Manuel Gonçalves1, Fabian Enderle2, Alfred Plettl2, Paul Ziemann2, and Othmar Marti1 — 1Ulm University - Institute of Experimental Physics, Ulm, Germany — 2Ulm University - Institute of Solid State Physics, Ulm, Germany
Optical trapping based on plasmonic structures has been employed to exert electromagnetic forces on dielectric materials, as dielectric beads. The plasmonic structures have to be tailored in order to generate strong field gradients necessary to trap small objects. The spatial distribution of the plasmonic particles can be adjusted using lithography methods. Their size is selected to obtain surface plasmon resonances at the wavelength of the trapping beam.
We have fabricated arrays of gold nanoparticles on top of silicon and quartz pillars, using nanosphere lithography (NSL) and etching techniques. The techniques employed permit to obtain large scale of subwavelength gold nanoparticles arranged in hexagonal and triangular arrays. The materials used have good biocompatibility and can be applied in biological applications requiring optical trapping. On the other hand, due to the optical absorption at plasmon resonances or intrinsic absorption at wavelengths below 550 nm, gold particles can serve as local heating sources.