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Optoelectronics Letters

, Volume 14, Issue 1, pp 1–5 | Cite as

Super-resolution longitudinally polarized light needle achieved by tightly focusing radially polarized beams

  • Chang-kun Shi (史长坤)
  • Zhong-quan Nie (聂仲泉)Email author
  • Yan-ting Tian (田彦婷)
  • Chao Liu (刘超)
  • Yong-chuang Zhao (赵永创)
  • Bao-hua Jia (贾宝华)
Article

Abstract

Based on the vector diffraction theory, a super-resolution longitudinally polarized optical needle with ultra-long depth of focus (DOF) is generated by tightly focusing a radially polarized beam that is modulated by a self-designed ternary hybrid (phase/amplitude) filter (THF). Both the phase and the amplitude patterns of THF are judiciously optimized by the versatile particle swarm optimization (PSO) searching algorithm. For the focusing configuration with a combination of a high numerical aperture (NA) and the optimized sine-shaped THFs, an optical needle with the full width at half maximum (FWHM) of 0.414λ and the DOF of 7.58λ is accessed, which corresponds to an aspect ratio of 18.3. The demonstrated longitudinally polarized super-resolution light needle with high aspect ratio opens up broad applications in high-density optical data storage, nano-photolithography, super-resolution imaging and high-efficiency particle trapping.

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Copyright information

© Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Chang-kun Shi (史长坤)
    • 1
  • Zhong-quan Nie (聂仲泉)
    • 1
    Email author
  • Yan-ting Tian (田彦婷)
    • 1
  • Chao Liu (刘超)
    • 1
  • Yong-chuang Zhao (赵永创)
    • 1
  • Bao-hua Jia (贾宝华)
    • 1
    • 2
  1. 1.Key Lab of Advanced Transducers and Intelligent Control System, Ministry of Education and Shanxi Province, College of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuanChina
  2. 2.Centre for Micro-Photonics, Faculty of Science, Engineering and TechnologySwinburne University of TechnologyMelbourneAustralia

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