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Optical Engineering

Incomplete annular beam
Author(s): Rijuparna Chakraborty; S. Sendhil Raja; Ajay Ghosh
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Paper Abstract

The wavefront of circular dark-hollow-beams with wavelength λ produces a helix of pitch m λ, where m is an integer. But the central phase singularity of such beams can also be generated reducing the pitch by using a modulo operation. When such a beam interferes destructively with an unmodified annular beam of the same order, an incomplete annular beam is produced. The final beam, generated using a standard computer-generated holographic procedure, retains its shape up to 1.5 cm. A potential use of such beams for manipulation of microorganisms has been indicated through a dynamic holographic procedure using a spatial light modulator.

Paper Details

Date Published: 1 February 2008
PDF: 6 pages
Opt. Eng. 47(2) 028002 doi: 10.1117/1.2834283
Published in: Optical Engineering Volume 47, Issue 2
Show Author Affiliations
Rijuparna Chakraborty, Univ. of Calcutta (India)
S. Sendhil Raja, Ctr. for Advanced Technology (India)
Ajay Ghosh, Univ. of Calcutta Chapter (India)

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