Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.11851/2722
Title: Rotationally tunable polarization-insensitive single and multifocal metasurface
Authors: Yılmaz, Nazmi
Özdemir, Aytekin
Özer, Ahmet
Kurt, Hamza
200103
Keywords: All-dielectric metasurfaces
tunable
visible spectrum
polarization-insensitive
multifocal
flat-optics
Issue Date: Apr-2019
Publisher: Institute of Physics Publishing
Source: Yilmaz, N., Ozdemir, A., Ozer, A., and Kurt, H. (2019). Rotationally tunable polarization-insensitive single and multifocal metasurface. Journal of Optics, 21(4), 045105.
Abstract: Metasurfaces with superior capabilities to tailor wave fronts of light have become one of the most widely investigated optical elements. Incorporating tunable features into the metasurface design is required. In this study, we have proposed and designed highly efficient rotationally tunable metasurface lens structures inspired by Moire lenses operating at a 532 nm wavelength. The proposed structures consist of two cascaded all-dielectric metasurfaces, which have reverse phase profiles with respect to each other. The metasurfaces are designed with periodically arranged TiO2 nano-rods on a SiO2 substrate in a square lattice. We demonstrated that the focal length changes nonlinearly according to the mutual rotation of metasurfaces from 30 degrees to 150 degrees with a focusing efficiency as high as 55% and a wide focal length variation between 11.4 mu m and 4.2 mu m. Moreover, we have designed and proposed a tunable polarization-insensitive multifunctional focal system. Using the proposed multifunctional focal system, focal planes can be formed in consecutive planes and the number of focal planes can be made single or multiple.
URI: https://hdl.handle.net/20.500.11851/2722
https://iopscience.iop.org/article/10.1088/2040-8986/ab0d5f
ISSN: 2040-8978
Appears in Collections:Elektrik ve Elektronik Mühendisliği Bölümü / Department of Electrical & Electronics Engineering
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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