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

doi:10.1117/12.2644019

4 January 2023 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

Author Affiliations +

Proceedings Volume 12322, Nanophotonics, Micro/Nano Optics, and Plasmonics VIII; 1232209 (2023) https://doi.org/10.1117/12.2644019
Event: SPIE/COS Photonics Asia, 2022, Online Only

Abstract

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 𝜆_𝑑 = 300 nm is reported, exploiting the approach of merging the Pancharatnam–Berry (PB) and propagation phases into a single metadevice. 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.

Conference Presentation

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Naureen Butt, Nasir Mahmood, Tauseef Tauqeer, Muhammad Zubair, Muhammad Qasim Mehmood, and Yehia Massoud "Realization of highly efficient trifocal metalens architecture with the blend of Pancharatnam-Berry and propagation phase effect", Proc. SPIE 12322, Nanophotonics, Micro/Nano Optics, and Plasmonics VIII, 1232209 (4 January 2023); https://doi.org/10.1117/12.2644019

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