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Subwavelength focusing of light by a tapered microtube

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      Abstract

      We propose a mechanism for subwavelength focusing at optical frequencies based on the use of a tapered microtube fabricated from a glass capillary tube. Using coherent illumination at 671nm and a near-field scanning optical microscope probe which was mounted on a 3-axis piezo nanopositioning stage, a sequence of 2-D intensity profiles were obtained. Our experimental results reveal the smallest focal spot with a near diffraction-limited full width at half-maximum of ~435nm(0.65{\lambda})at a distance of ~1.47{\mu}m (2.2{\lambda}) from the output endface of microtube. The experimental results are in excellent agreement with our numerical simulation.

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      Subwavelength focusing by a micro/nanofiber array

       Xiao Wang,  Jian Fu,  Xu Liu (2009)
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        Author and article information

        Journal
        18 June 2010
        1006.3619
        10.1063/1.3472224

        http://arxiv.org/licenses/nonexclusive-distrib/1.0/

        Custom metadata
        3 pages, 3 figures
        physics.optics

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