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9 September 2019 Three-dimensional measurement of the Helicity-dependent forces on a Mie particle (Conference Presentation)
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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.
Conference Presentation
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Lulu Liu, Andrea Di Donato, Vincent Ginis, Simon Kheifets, and Federico Capasso "Three-dimensional measurement of the Helicity-dependent forces on a Mie particle (Conference Presentation)", Proc. SPIE 11083, Optical Trapping and Optical Micromanipulation XVI, 110831X (9 September 2019);

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