Generation of Concentric Space-Variant Linear Polarized Light by Dielectric Metalens

Wen Hao Chang, Jun Han Lin, Chieh Hsiung Kuan, Ssu Yen Huang, Yann Wen Lan, Ting Hua Lu

Research output: Contribution to journalArticlepeer-review

Abstract

Miniaturized flat and ultrathin optical components with spatial and polarization degrees of freedom are important for optical communications. Here, we use nanostructures that act as tiny phase plates on a dielectric metalens to generate a concentric polarization beam with different orientations along the radial direction. The important discoveries are that (1) the circularly polarized light can be converted into linearly polarized states with a different orientation at near field and that (2) this orientation is strongly correlated to the rotation of the nanostructures on the metalens. Stokes parameters are utilized to investigate the comprehensive polarization states embedded in the optical intensity along the propagation direction. The variation of the spatial polarization states transformed by the dielectric metalens can be properly mapped onto the Poincaré sphere. We believe that the variety of spatial polarizations within a miniaturized configuration provides a new degree of freedom for diverse applications in the future.

Original languageEnglish
Pages (from-to)562-568
Number of pages7
JournalNano Letters
Volume21
Issue number1
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • circular polarized light
  • linear polarized light
  • metalens
  • polarization states
  • space variant

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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