On-demand holographic optical tweezers
This review is concerned with a highly controllable holographic optical tweezers (HOTs) system that was developed to manipulate micro objects in the microscopic region. The process can be interactively carried out by virtue of time-division multiplexing of computer-generated holograms and the shifting theorem in the Fourier transform to displace the carrier spot in the focal plane of an objective lens. Time-division multiplexing was used to quasi-simultaneously generate two different intensity patterns, a carrier beam spot and a beam-spots array, by alternately feeding the corresponding hologram patterns to a spatial light modulator. The study on the trapping stability is demonstrated by a numerical simulation using the Smoluchowski equation and the generalized Lorentz-Mie theory model. The applicability of the on-demand HOTs system will be shown throughout the review.
- 1 Tokyo University of Agriculture and Technology, BASE