Título

Analysis of the orbital angular momentum in colliding airy-vortex beams

Autor

CARMELO GUADALUPE ROSALES GUZMAN

Colaborador

RUBEN RAMOS GARCIA (Asesor de tesis)

Nivel de Acceso

Acceso Abierto

Resumen o descripción

The fact that light carries orbital angular momentum (OAM) associated to singularities embedded

in the phase function of optical fields was recently discovered by Allen. A couple of

years later, Courtial demonstrated that light beams might also possess OAM without the presence

of a singularity. Over the past years, OAM has been the subject of intense experimental

and theoretical study, including its conservation. Laguerre-Gaussian and Bessel are among the

most well-known beams with phase singularities carrying OAM. Fairly recently, Dholakia et al.

generated, by inserting a phase singularity into the main lobe of an Airy beam, a novel kind

of beam carrying OAM. As was expected, the vortex accelerates in a direction perpendicular

to the beam axis of propagation similar to an Airy beam. Motívate by this peculiarity, we

experimentally generated two Airy-vortex beams with opposite acceleration in order to study

the OAM during the collision. To our knowledge, there are no reports on the analysis of OAM

in collisions of beams carrying OAM. Two experiments were carried out, the first one involves

collisions of two beams carrying the same amount of OAM. In the second one, we collide beams

carrying opposite OAM. Analysis of the phase function from several planes perpendicular to

the propagation axis leads us to conclude that after the collision of two beams having the same

OAM, the phase singularity does not disappear. Whereas in the case where the beams have

opposite OAM, the phase singularity annihilates during the collision. These experiences suggest

a conservation of the OAM associated with phase singularities. Analysis of the phase was done

by means of a new technique proposed by Mazilu et al., which allows to detect and track the

singularities embedded in the phase function.

Editor

Instituto Nacional de Astrofísica, Óptica y Electrónica

Fecha de publicación

septiembre de 2010

Tipo de publicación

Tesis de maestría

Versión de la publicación

Versión aceptada

Formato

application/pdf

Idioma

Inglés

Audiencia

Estudiantes

Investigadores

Público en general

Sugerencia de citación

Rosales-Guzman R.G.

Repositorio Orígen

Repositorio Institucional del INAOE

Descargas

2001

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