PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
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.
Lulu Liu,Andrea Di Donato,Vincent Ginis,Simon Kheifets, andFederico 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); https://doi.org/10.1117/12.2530298
ACCESS THE FULL ARTICLE
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
The alert did not successfully save. Please try again later.
Lulu Liu, Andrea Di Donato, Vincent Ginis, Simon Kheifets, 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); https://doi.org/10.1117/12.2530298