An optically levitated silica nanoparticle was released, fell freely for up to 0.25 ms under gravity, was recaptured by a second optical tweezer, and showed an approximately 190-fold growth in position uncertainty.
Optimal Position Detection of a Dipolar Scatterer in a Focused Field
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abstract
We theoretically analyze the problem of detecting the position of a classical dipolar scatterer in a strongly focused optical field. We suggest an optimal measurement scheme and show that it resolves the scatterer's position in three dimensions at the Heisenberg limit of the imprecision-backaction product. We apply our formalism to levitated-optomechanics experiments and show that backscattering detection provides sufficient information to feedback-cool the particle's motion along the optical axis to a phonon occupancy below unity under realistic experimental conditions.
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Trap-to-trap free falls with an optically levitated nanoparticle
An optically levitated silica nanoparticle was released, fell freely for up to 0.25 ms under gravity, was recaptured by a second optical tweezer, and showed an approximately 190-fold growth in position uncertainty.