Rotationally tunable polarization-insensitive single and multifocal metasurface
| Autor: | Ahmet Ozer, Nazmi Yilmaz, Hamza Kurt, Aytekin Ozdemir |
|---|---|
| Přispěvatelé: | TOBB ETU, Faculty of Engineering, Department of Electrical & Electronics Engineering, TOBB ETÜ, Mühendislik Fakültesi, Elektrik ve Elektronik Mühendisliği Bölümü, Kurt, Hamza |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
multifocal business.industry 02 engineering and technology Moiré pattern All-dielectric metasurfaces Polarization (waves) Square lattice Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials law.invention Lens (optics) visible spectrum Wavelength 020210 optoelectronics & photonics Optics law 0202 electrical engineering electronic engineering information engineering Focal length polarization-insensitive tunable flat-optics business Visible spectrum |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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