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Journal ArticleDOI

Space bound optical vortex: A novel concept

20 Aug 2009-Japanese Journal of Applied Physics (IOP Publishing)-Vol. 48, Iss: 8, pp 082401
TL;DR: In this article, a procedure for the generation of three-dimensional optical vortex, often called an optical black hole, has been reported, which can be used in optical-tweezer to trap a particle at a particular point in space.
Abstract: A procedure for the generation of three-dimensional optical vortex – often called an optical black hole – has been reported in this paper. The mask needed to generate such a beam must be three-dimensional one and can be achieved using stack of diffractive-optical-elements. Two different formulas used to produce this three-dimensional vortex and the simulated results show that both the formulas are equally good. This can be used in optical-tweezer to trap a particle at a particular point in space.
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Journal ArticleDOI
TL;DR: The characteristics of a singularity in a nondiffracting Bessel beam is explored experimentally by use of a programmable spatial light modulator with 64-level phase holograms and the diffraction efficiency is greatly improved.
Abstract: A laser beam with phase singularities is an interesting object to study in optics and may have important applications in guiding atoms and molecules. We explore the characteristics of a singularity in a nondiffracting Bessel beam experimentally by use of a programmable spatial light modulator with 64-level phase holograms. The diffraction efficiency with 64-level phase holograms is greatly improved in comparison with that obtained with a binary grating. The experiments show that the size and deflection angle of the beam can be controlled in real time. The observations are in agreement with scalar diffraction theory.

241 citations

Journal ArticleDOI
TL;DR: The first experimental observation of parabolic non-diffracting beams is reported, and the experimental transverse patterns show an inherent parabolic structure in good agreement with the theoretical predictions.
Abstract: We report the first experimental observation of parabolic non-diffracting beams, the fourth fundamental family of propagation-invariant optical fields of the Helmholtz equation We generate the even and odd stationary parabolic beam and with them we are able to produce traveling parabolic beams It is observed that these fields exhibit a number of unitary in-line vortices that do not interact on propagation The experimental transverse patterns show an inherent parabolic structure in good agreement with the theoretical predictions Our results exhibit a transverse energy flow of traveling beams never observed before

74 citations