Journal
OPTICS EXPRESS
Volume 13, Issue 10, Pages 3862-3867Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.003862
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We present a deterministic method to generate modified helical beams which create optical vortices with desired dark core intensity patterns in the far-field. The experiments are implemented and verified by a spatial light modulator (SLM), which imprints a phase function onto the incident wavefront of a TEM00 laser mode to transform the incident beam into a modified helical beam. The phase function can be calculated once a specific dark core shape of an optical vortex is required. The modified helical beam is exploited in optical manipulation with verification of its orbital angular momentum experimentally. (C) 2005 Optical Society of America.
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