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We demonstrated the fabrication of twisted fiber by illumination of a 405nm continuous wave optical vortex onto a glass cell containing ultraviolet curing resin. A twisted fiber with a length of ∼160μm was established by an exposure time of only 1 second, and its twisted direction and branching number were fully assigned based on the handedness and the topological charge of the illuminated optical...
We experimentally create a ‘perfect’ vortex beam, which has a uniform ring profile and fixed radius. In contrast with other vortex fields, the intensity profile is independent of its topological charge. We then correct this field in situ using a single trapped particle as a probe. This results in a constant angular velocity for the particle regardless of its position on the beam...
We trap and rotate particles using a perfect vortex beam with integer or fractional topological charges. A linear relationship is observed between the rotation speed and orbital angular momentum content of the beam.
We demonstrate optical trapping of a microgyroscope rotating at MHz rates in vacuum. The particle is cooled to 40K. This is a major step towards measuring the Casimir force resulting in rotational quantum friction.
Photoporation (optical injection) of mammalian cells using a tightly focused femtosecond laser beam is demonstrated within a microfluidic chip, providing delivery of cells to the beam and thus automating the system for high cell throughput.
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