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Título : Angular momentum of optical vortex arrays
Autor : Courtial, Johannes; Zambrini, Roberta ; Dennis, Mark R.; Vasnetsov, Mikhail
Palabras clave : Optics
Orbital angular momentum
Optical vortices, mechanics
Fecha de publicación : 23-ene-2006
Editor: Optical Society of America
Citación : Optics Express 14, 938-949 (2006)
Resumen: Guided by the aim to construct light fields with spin-like orbital angular momentum (OAM), that is light fields with a uniform and intrinsic OAM density, we investigate the OAM of strictly periodic arrays of optical vortices with rectangular symmetry. We find that the OAM per unit cell depends on the choice of unit cell and can even change sign when the unit cell is translated. This is the case even if the OAM in each unit cell is intrinsic, that is independent of the choice of measurement axis. We show that spin-like OAM can be found only if the OAM per unit cell vanishes. Our results are applicable to the z component of the angular momentum of any x- and y-periodic momentum distribution in the xy plane, and can also be applied to other periodic light beams and arrays of rotating solids or liquids.
Versión del editor: http://dx.doi.org/10.1364/OPEX.14.000938
URI : http://hdl.handle.net/10261/6062
DOI: 10.1364/OPEX.14.000938
ISSN: 1094-4087
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