Journal
NEW JOURNAL OF PHYSICS
Volume 11, Issue -, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/11/4/043004
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Funding
- DGAPA-UNAM [IN-114407]
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We present a theoretical analysis and an experimental demonstration of a wave field constituted by an axial array of vortices consecutively inverting the topological charge over distances of one-quarter of a wavelength. It exhibits a periodic gradient of the orbital angular momentum density along a single axis, although the field is created by the superposition of counter-propagating waves possessing no angular momentum themselves. The experiment is carried out with acoustic waves, whose wavelength is sufficiently large to allow a three-dimensional mapping of the field in amplitude and phase.
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