Mr. Ronald K. Rop Profile

Ronald K. Rop

at Moi Univ

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Proceedings Article | 17 October 2012 Paper

Putting light in a spin

A. Dudley, R. Rop, I. Litvin, C. López-Mariscal, F. Roux, A. Forbes

Proceedings Volume 8490, 84900A (2012) https://doi.org/10.1117/12.970682

KEYWORDS: Bessel beams, Digital holography, Superposition, Holograms, Spatial light modulators, Wave propagation, Physics, Modes of laser operation, Solids, Light wave propagation

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We experimentally generated superpositions of higher-order Bessel beams that possess no global orbital angular momentum (OAM), yet exhibit an angular rotation in their intensity profile as the field propagates. The digital holograms encoded on a spatial light modulator (SLM), used for generating such fields, consist of two annular rings of unequal radial wave-vectors where each ring is encoded with an azimuthal mode of equal order but opposite charge. We present experimentally measured angular rotation rates for some example superposition fields, which are shown to be in good agreement with that predicted theoretically. Introducing a second SLM and a Fourier transforming lens, we demonstrate a simple approach to perform an azimuthal decomposition of our generated optical fields. Bounding the match-filter to an annular ring, of varying radius, we are able to perform a scale-independent azimuthal decomposition of our initial field. From the measured weightings of the azimuthally decomposed modes we show reconstruction of the cross-sectional intensity profile and OAM density of our initial field.

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