Negative propagation effect in nonparaxial Airy beams



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Martínez Matos, Óscar and Vaveliuk, Pablo (2012) Negative propagation effect in nonparaxial Airy beams. Optics Express, 20 (24). pp. 26913-26921. ISSN 1094-4087

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Negative propagation is an unusual effect concerning the local sign change in the Poynting vector components of an optical beam under free propagation. We report this effect for finite-energy Airy beams in a subwavelength nonparaxial regime. This effect is due to a coupling process between propagating and evanescent plane waves forming the beam in the spectral domain and it is demonstrated for a single TE or TM mode. This is contrary to what happens for vector Bessel beams and vector X-waves, for which a complex superposition of TE and TM modes is mandatory. We also show that evanescent waves cannot contribute to the energy flux density by themselves such that a pure evanescent Airy beam is not physically realizable. The break of the shape-preserving and diffraction-free properties of Airy beams in a nonparaxial regime is exclusively caused by the propagating waves. The negative propagation effect in subwavelength nonparaxial Airy beams opens new capabilities in optical traps and tweezers, optical detection of invisibility cloacks and selective on-chip manipulation of nanoparticles.

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© 2012 Optical Society of America.
The Authors thank Val´eria Loureiro da Silva for valuable advice. Financial support from the Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq), Brazil, under project 477260/2010-1 and Spanish Ministry of Science and Innovation under projects TEC 2008-04105 and TEC 2011-23629 is acknowledged. P.V. acknowledges a PQ fellowship of CNPq. The publication of this work was supported by Servicio Nacional de Aprendizagem Industrial (SENAI)-DR/Bahia, Brazil.

Uncontrolled Keywords:Accelerating Parabolic Beams, Laser-Beams, Paraxiality, Generation, Waves
Subjects:Sciences > Physics > Optics
ID Code:25123
Deposited On:24 Apr 2014 08:42
Last Modified:24 Apr 2014 08:42

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