Hameed, N.M. ; EL Eter, A. ; Grosjean, T. ; Baida, F.I.
We study optical trapping of small particles based on the use of a Bowtie Nanoaperture Antenna (BNA) engraved at the end of a metal coated near field optical microscope tip. Within the obtained light confinement, a 3D trapping of latex nanoparticles is studied and quantified as a function of the incident light power. Good agreement between experimental and numerical results is obtained for a BNA operating in water at ( = 1064 nm) that faithfully traps 250 nm-radius latex particles. Further numerical investigations are performed to study the dynamic of the trapping process in comparison with experimental results. In addition, numerical results for R = 100 nm and R = 30 nm-radii latex particles are presented and show that such a configuration has the potential to trap latex particles as small as 30 nm-radius.
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