Single atom movement with dynamic holographic optical tweezers

Abstract

We report an experimental implementation of dynamical holographic tweezers for single trapped atoms. The tweezers are realized with dynamical phase holograms displayed on the liquid crystal spatial light modulator. We experimentally demonstrate the possibility to trap and move single rubidium atoms with such dynamic potentials, and study its limitations. Our results suggest that high probability transfer of single atoms in the tweezers may be performed in large steps, much larger then the trap waist. We discuss intensity-flicker in holographic traps and techniques for its suppression. Loss and heating rates in dynamic tweezers are measured and no excess loss or heating is observed in comparison with static traps.

Dynamics of a spin qubit in an optical dipole trap

“…In the experiment, the microscopic dipole trap is formed by a beam of an 852 nm diode laser, tightly focused with an 0.77 NA aspheric lens installed inside a UHV chamber with a base pressure below 10 −10 mbar. A detailed description of the setup may be found in [31]. Focusing of the trapping laser to a 1/e 2 intensity waist around 1.4 µm allows us to trap atoms ensuring single atom occupation by collisional blockade in the presence of MOT light [32].…”

Mind-Controlled Optical Manipulation

“…The OAM of light is related to the helical phase front of optical vortex beam, quantized by L = l ℏ per photon, where l is the topological charge and ℏ is the reduced Planck constant. , After that, various structured lights with tailored phase and amplitude have been developed for optical manipulation. − Meanwhile, human–computer interfaces were introduced to optical tweezers, which allow the operator to control the movement of micro-objects using different sensors, such as an optically trapped glove, a joystick-controlled gripper, and a multimodal natural user interface. , Besides, some new approaches for optical manipulation have also been proposed, such as plasmonic tweezers, , six-dimensional structured optical tweezers, and heat-mediated techniques . Optical tweezers for their noncontact and precise manipulation features have promising applications in materials science, nanofabrication, − atomic physics, − and biological fields. − It is worth noting that all the aforementioned optical manipulation approaches are controlled by mechanical actuators rather than the human brain.…”

Holographic Optical Tweezers: Techniques and Biomedical Applications

“…Optical tweezers (OT) [1] utilize a highly focused laser beam to manipulate a microscaleto-nanoscale [2,3] particle or single atom [4]. The particles in Brownian motion are restricted within the focal region because of the intensity gradient change and momentum transfer.…”