Periodical focusing mode achieved through a chain of mesoscale dielectric particles with a refractive index near unity

Cheng Yang Liu, Oleg V. Minin, Igor V. Minin

Research output: Contribution to journalArticle


At present three main mechanisms of optical propagation with periodically focused modes in the chains of dielectric spherical particles with a refractive index near n [Formula presented] 1.59 are considered in the literature: evanescent whispering gallery mode coupling, photonic nanojet-induced modes, and the propagation of transverse magnetic modes under conditions close to Brewster angle geometry. In this paper we show that quasi-periodical focusing modes exist in a range of near unity refractive indices for chains of dielectric particles in both spherical and cubic forms. We also show that such a medium can be considered a gradient index waveguide with a parabolic law of refractive index variation.

Original languageEnglish
Pages (from-to)110-117
Number of pages8
JournalOptics Communications
Publication statusPublished - 1 Mar 2019



  • Mesoscale particle
  • Periodical focusing mode
  • Photonic jet
  • Refractive index

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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