Thursday, May 24, 2012

Bessel beam "tractor beam" concept theoretically demonstrated

Bessel beam "tractor beam" concept theoretically demonstrated: Haifeng Wang at the A*STAR Data Storage Institute and colleagues studied the properties of Bessel beams, which, unlike normal laser beams, don’t diffract or spread out as they propagate. While light will usually be scattered backwards when a laser beam hits a small particle in its path, pushing the particle forward, the A*STAR team showed theoretically that light from a Bessel beam scatters off particles that are sufficiently small in a forward direction...
While true Bessel beams are impossible to create, as they would require an infinite amount of energy, reasonably good approximations can be made and are used in many optical applications.

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