We present a novel family of paraxial optical beams having a confluent hypergeometric transverse profile, which we name hypergeometric Gauss modes of type-II (HyGG-II). These modes are eigenmodes of the photon orbital angular momentum and they have the lowest beam divergence in the waist of HyGG-II among all known finite power paraxial modes families. We propose to exploit this feature of HyGG-II modes for generating, after suitable focusing, a 'light needle' having record properties in terms of size and aspect ratio, possibly useful for near-field optics applications. (C) 2008 Optical Society of America
Improved focusing with Hypergeometric-Gaussian type-II optical modes
Marrucci L;
2008
Abstract
We present a novel family of paraxial optical beams having a confluent hypergeometric transverse profile, which we name hypergeometric Gauss modes of type-II (HyGG-II). These modes are eigenmodes of the photon orbital angular momentum and they have the lowest beam divergence in the waist of HyGG-II among all known finite power paraxial modes families. We propose to exploit this feature of HyGG-II modes for generating, after suitable focusing, a 'light needle' having record properties in terms of size and aspect ratio, possibly useful for near-field optics applications. (C) 2008 Optical Society of AmericaFile in questo prodotto:
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