Share Email Print
cover

Proceedings Paper

Optical trapping of nanoshells near resonance
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper 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.

Paper Details

Date Published: 26 August 2008
PDF: 8 pages
Proc. SPIE 7032, Plasmonics: Metallic Nanostructures and Their Optical Properties VI, 70321Z (26 August 2008); doi: 10.1117/12.795224
Show Author Affiliations
Brooke C. Hester, National Institute of Standards and Technology (United States)
Rani B. Kishore, National Institute of Standards and Technology (United States)
Kristian Helmerson, National Institute of Standards and Technology (United States)
Naomi J. Halas, Rice Univ. (United States)
Carly Levin, Rice Univ. (United States)


Published in SPIE Proceedings Vol. 7032:
Plasmonics: Metallic Nanostructures and Their Optical Properties VI
Mark I. Stockman, Editor(s)

© SPIE. Terms of Use
Back to Top