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An ultra-thin beam splitter design using a-Si:H based on hhase gradient metasurfaces
Ahmed, Hammad; Ali, Muhammad Mahmood; Ullah, Arif; Rahim, Arbab Abdur; Maab, Husnul; Khan, Mahmood
This paper explicates the design of an ultra-thin beam splitter based on phase gradient metasurfaces using amorphous silicon hydrogenated (a-Si:H) nano cylinders for the visible frequency of 474 THz. The a-Si:H nano cylinders exhibit low losses in the visible regime compared to standard a-Si, and small size due to reduced aspect ratio compared to other highly efficient materials such as TiO2 and GaN. In the proposed design, incident wave at a single operating frequency of 474 THz in visible regime is split into two different directions according to the generalized Snell’s law of refraction. The angles of refracted waves are controlled by choosing different phase gradients. Based on this concept, three metasurfaces are designed and simulated using finite difference time domain numerical method for various split angles (31.8 , −31.8 , (−44.6 , 31.8 and (−44.6 , 20.5°)
Keyword(s): ultra-thin; beam splitter; phase gradient metasurfaces; dielectric materials; amorphous silicon hydrogenated
Publication Date:
2019
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University of Limerick
Citation(s): Journal of Nanoelectronics and Optoelectronics;14, pp. 1-5
http://dx.doi.org/10.1166/jno.2019.2614
Publisher(s): American Scientific Publishers
First Indexed: 2020-03-07 07:15:09 Last Updated: 2020-03-07 07:15:09