Formation of complex wavefronts by use of quasi-periodic subwavelength structures

Avi Niv, Gabriel Biener, Vladimir Kleiner, Erez Hasman

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Space-variant Pancharatnam-Berry phase optical elements based on computer-generated subwavelength gratings are presented. By continuously controlling the local orientation and period of the grating we can achieve any desired phase element. Unlike diffractive and refractive elements, the phase is not introduced through optical path differences, but results from the geometrical phase that accompanies space-variant polarization manipulation. We introduce and experimentally demonstrate Pancharatnam-Berry phase optical elements (PBOEs) such as polarization beam-splitters, optical switches and spiral phase. We also introduce and experimentally demonstrate quanitized pancharatnam-Berry phase diffractive optics. We realized quantized geometrical blazed polarization diffraction gratings, as well as a polarization dependent focusing lens for CO2 laser radiation at a wavelength of 10.6 micron on GaAs substrates. We also demonstrate the formation of propagation-invariant linearly polarized axial symmetric beams by use of quantized Pancharatnam-Berry optical elements. Finally a novel method for real time polarimetry and infrared polarization scrambler by use of quasi-periodic subwavelength structures is presented.

Original languageEnglish
Pages (from-to)126-136
Number of pages11
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 10 May 2004
Externally publishedYes
EventMicromachining Technology for Micro - Optics and Nano - Optics II - San Jose, CA., United States
Duration: 27 Jan 200429 Jan 2004


  • Berry's phase
  • Computer-generated holograms
  • Ellipsometry and polarimetry
  • Polarization
  • Propagation invariant
  • Subwavelength gratings

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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