1 February 2008 Incomplete annular beam
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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.
© (2008) Society of Photo-Optical Instrumentation Engineers (SPIE)
Rijuparna Chakraborty, S. Sendhil Raja, Ajay Ghosh, "Incomplete annular beam," Optical Engineering 47(2), 028002 (1 February 2008). https://doi.org/10.1117/1.2834283 . Submission:

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