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Manipulating twisted light beam through all-dielectric metasurfaces
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Paper Abstract

Recently emerged metasurfaces, the two-dimensional (2D) counterpart of three dimensional (3D) metamaterials, gained significant attention in optics and photonics due to their less challenging fabrication requirements (compared to 3D metamaterials) and unique capabilities of wavefront manipulation by introducing abrupt phase shift. Realization of multiple functionalities in a single metasurface, is an intriguing perception to achieve further miniaturization and cost effectiveness. In this paper, we propose a polarization insensitive, highly efficient metasurfaces for the visible spectrum. For the design wavelength of 633nm, negligible absorption coefficient (k) and adequately large refractive index (n) of proposed hydrogenated amorphous silicon (a-Si:H) leads to considerably efficient and cost-effective solution towards metasurfaces design. Inherent property of cylindrical pillar to be polarization insensitive is exploited and 400 nm thick cylindrical nano–waveguide is opted as building block to construct the metasurface. A novel design strategy of achieving multiple functionalities from a single metasurface is proposed, where a combined effect of lensing and optical vortices with different topological charges at different focal planes is demonstrated for the proof of concept. Such unique design strategy of integrating multiple phases into a single device provides an innovative way of miniaturizing the optical devices and systems exhibiting versatile functionalities for on–chip applications.

Paper Details

Date Published: 4 March 2019
PDF: 8 pages
Proc. SPIE 10928, High Contrast Metastructures VIII, 1092811 (4 March 2019); doi: 10.1117/12.2508545
Show Author Affiliations
Nasir Mahmood, National Univ. of Sciences and Technology (Pakistan)
Muhammad Qasim Mehmood, Information Technology Univ. of the Punjab (Pakistan)
National Univ. of Sciences and Technology (Pakistan)
Inki Kim, Pohang Univ. of Science and Technology (Korea, Republic of)
Muhammad Afnan Ansari, Information Technology Univ. of the Punjab (Pakistan)
Tauseef Tauqeer, Information Technology Univ. of the Punjab (Pakistan)
Farooq Ahmad Tahir, National Univ. of Sciences and Technology (Pakistan)
Junsuk Rho, Pohang Univ. of Science and Technology (Korea, Republic of)

Published in SPIE Proceedings Vol. 10928:
High Contrast Metastructures VIII
Connie J. Chang-Hasnain; Andrei Faraon; Weimin Zhou, Editor(s)

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