Tapered nanofiber trapping of high-refractive-index nanoparticles
| Autor: | Swaim, Jon D., Knittel, Joachim, Bowen, Warwick P. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/1.4829659 |
| Popis: | A nanofiber-based optical tweezer is demonstrated. Trapping is achieved by combining attractive near-field optical gradient forces with repulsive electrostatic forces. Silica-coated Fe$_2$O$_3$ nanospheres of 300 diameter are trapped as close as 50 nm away from the surface with 810 $\mu$W of optical power, with a maximum trap stiffness of 2.7 pN $\mu$m$^{-1}$. 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 $\AA / \sqrt{\text{Hz}}$. Comment: 4 pages and 3 figures |
| Databáze: | arXiv |
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