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26 August 2008 Optical trapping of nanoshells near resonance
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We examine the enhancement of optical trapping forces due to plasmon resonances of nanoshells. Nanoshells are nanoscale particles with a dielectric core and metallic coating that exhibit tunable plasmon resonances. Theory predicts that the optical trapping force may be three to fifty times larger for trapping-laser wavelengths near resonance than for wavelengths far from resonance [1]. The resonance absorption of nanoshells can be tuned by adjusting the ratio of the radius of the dielectric core, r1, to the total radius, r2 [2]. Using back focal plane detection, we measure the trap stiffness of optical tweezers, from lasers at 973 nm and 1064 nm, for single trapped nanoshells with several different r1/r2 ratios. Enhanced trapping strengths are not found through these measurements done with single wavelength optical traps. A tunable-wavelength laser trap will enable more conclusive results.
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Brooke C. Hester, Rani B. Kishore, Kristian Helmerson, Naomi J. Halas, and Carly Levin "Optical trapping of nanoshells near resonance", Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70321Z (26 August 2008);

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