Realization of highly efficient trifocal metalens architecture with the blend of Pancharatnam–Berry and propagation phase effect

Naureen Butt, Nasir Mahmood, Tauseef Tauqeer, Muhammad Zubair, Muhammad Qasim Mehmood, Yehia Massoud*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

7 Scopus citations


Light-matter interaction at the micron scale enables unprecedented control over different intrinsic properties of electromagnetic waves. Recently emerged ultrathin metamaterials (metasurfaces) featuring periodic nanoantennas are capable of controlling the amplitude, phase, and polarization states of the incident light and open up new avenues for a variety of exotic nanophotonic applications. Integrating multiple optical phenomena into a single nano-optical device has become a hotspot to increase the multi-functionality of the metasurfaces for functional multiplexing, notably reducing the intricacy of the existing optical setups. Herein, a multifunctional metalens operating at ultraviolet regime λd = 300 nm is reported, exploiting the approach of merging the Pancharatnam–Berry (PB) and propagation phases into a single meta-device. Through interleaving the different subwavelength rectangular and cylindrical shaped nanoantennas of silicon nitride (Si3N4) patterned on sapphire (Al2O3) substrate, the proposed meta-device results in a multifunctional metalens capable of focusing the incident light at three different focal spots on the same focal plane. The geometric parameters of both the nanoantennas (rectangular bar and cylindrical pillar) are optimized in such a way to achieve the maximum possible transmission intensity and complete phase coverage requirements for higher resolution focusing on making nanoscale features distinguishable. This attractive design topology of merging the multiple phases into a single device to realize a multifunctional meta-device can envision its promising application in imaging and optical communication.

Original languageEnglish (US)
Title of host publicationNanophotonics, Micro/Nano Optics, and Plasmonics VIII
EditorsZhiping Zhou, Kazumi Wada, Limin Tong
ISBN (Electronic)9781510657106
StatePublished - 2022
EventNanophotonics, Micro/Nano Optics, and Plasmonics VIII 2022 - Virtual, Online, China
Duration: Dec 5 2022Dec 11 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceNanophotonics, Micro/Nano Optics, and Plasmonics VIII 2022
CityVirtual, Online


  • Metalens
  • Pancharatnam–Berry
  • propagation phase
  • sapphire
  • silicon nitride
  • trifunctional

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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