Super-Enhancement Focusing of Teflon Spheres

Liyang Yue, Zengbo Wang, Bing Yan, James N. Monks, Yasir Joya, Rakesh Dhama, Oleg V. Minin, Igor V. Minin

Research output: Contribution to journalArticlepeer-review


A Teflon (polytetrafluoroethylene) sphere can be used as a focusing lens in the applications of imaging and sensing due to its low-loss property in the terahertz band. Herein, field intensities and focusing parameters are analytically calculated for Teflon spheres at different low-loss levels and then a super-enhancement focusing effect in the spheres with particular size parameters was discovered, which can stimulate about 4000 times stronger field intensity than that for incident radiation as well as the great potential of overcoming diffraction limit despite high sensitivity to the magnitude of Teflon loss. A subsequent analysis of scattering amplitudes proves that the strong scattering of a single-order mode in the internal electric or magnetic field is the main factor causing this phenomenon.

Original languageEnglish
Article number2000373
JournalAnnalen der Physik
Issue number10
Publication statusPublished - 1 Oct 2020


  • dielectric particles
  • low-loss materials
  • Mie theory
  • near-field focusing
  • Teflon spheres

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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