Optical trapping of nanoshells near resonance

Brooke C. Hester; Rani B. Kishore; Kristian Helmerson; Naomi J. Halas; Carly Levin

doi:10.1117/12.795224

26 August 2008 Optical trapping of nanoshells near resonance

Brooke C. Hester, Rani B. Kishore, Kristian Helmerson, Naomi J. Halas, Carly Levin

Proceedings Volume 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI; 70321Z (2008) https://doi.org/10.1117/12.795224
Event: NanoScience + Engineering, 2008, San Diego, California, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.795224

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