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Proceedings Paper

Three-dimensional measurement of the Helicity-dependent forces on a Mie particle (Conference Presentation)
Author(s): Lulu Liu; Andrea Di Donato; Vincent Ginis; Simon Kheifets; Federico Capasso

Paper Abstract

We introduce a floating-probe force spectroscopy technique with femtonewton resolution and piconewton range, capable of simultaneous measurement of a three-dimensional force field [1]. The technique is uniquely suited to optical force measurements and can be tailored to generate a force map in a plane or a three-dimensional volume. We apply our technique to the measurement of helicity-dependent spin-momentum forces on a non-chiral microsphere in an evanescent optical field. A direct measurement of such spin-dependent forces has thus-far been elusive, as the widely differing force magnitudes in the three spatial dimensions place stringent demands on a measurement’s sensitivity and range. Our results show quantitative agreement with theory and represent the first direct and simultaneous measurement of all components of this polarization-dependent optical force. [1] Liu, Lulu, et al. "Three-Dimensional Measurement of the Helicity-Dependent Forces on a Mie Particle." Physical review letters 120.22 (2018): 223901.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110831X (9 September 2019);
Show Author Affiliations
Lulu Liu, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Andrea Di Donato, Univ. Politecnica delle Marche (Italy)
Vincent Ginis, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Simon Kheifets, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)
Federico Capasso, Harvard John A. Paulson School of Engineering and Applied Sciences (United States)


Published in SPIE Proceedings Vol. 11083:
Optical Trapping and Optical Micromanipulation XVI
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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