Tapered nanofiber trapping of high-refractive-index nanoparticles

Swaim, Jon D., Knittel, Joachim and Bowen, Warwick P. (2013) Tapered nanofiber trapping of high-refractive-index nanoparticles. Applied Physics Letters, 103 20: . doi:10.1063/1.4829659

Author Swaim, Jon D.
Knittel, Joachim
Bowen, Warwick P.
Title Tapered nanofiber trapping of high-refractive-index nanoparticles
Journal name Applied Physics Letters   Check publisher's open access policy
ISSN 0003-6951
Publication date 2013-11-11
Year available 2013
Sub-type Article (original research)
DOI 10.1063/1.4829659
Open Access Status DOI
Volume 103
Issue 20
Total pages 5
Place of publication College Park, MD United States
Publisher American Institute of Physics
Language eng
Subject 3101 Physics and Astronomy (miscellaneous)
Abstract A nanofiber-based optical tweezer is demonstrated. Trapping is achieved by combining attractive near-field optical gradient forces with repulsive electrostatic forces. Silica-coated Fe2O3 nanospheres of 300 diameter are trapped as close as 50 nm away from the surface with 810 μW of optical power, with a maximum trap stiffness of 2.7 pN μm-1. Electrostatic trapping forces up to 0.5 pN are achieved, a factor of 50 larger than those achievable for the same optical power in conventional optical tweezers. Efficient collection of the optical field directly into the nanofiber enables ultra-sensitive tracking of nanoparticle motion and extraction of its characteristic Brownian motion spectrum, with a minimum position sensitivity of 3.4 Å/√Hz.
Keyword Physics, Applied
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID DP0987146
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2014 Collection
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