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Improved focusing with hypergeometric-gaussian type-II optical modes

, : Improved focusing with hypergeometric-gaussian type-II optical modes. Optics Express 16(25): 21069-21075

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.


PMID: 19065247

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