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21 February 2018 Polarization-independent dielectric metasurface for mid-infrared applications
Mostafa Abdelsalam, Ahmed M. Mahmoud, Mohamed Swillam
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Proceedings Volume 10542, High Contrast Metastructures VII; 105421D (2018) https://doi.org/10.1117/12.2290953
Event: SPIE OPTO, 2018, San Francisco, California, United States
Abstract
Metamaterials (MMs) are composite structures that exhibit non-conventional optical properties. Conventional threedimensional MMs are rather bulky, usually require complicated fabrication techniques and are not CMOS technology compatible. On the other hand, there has been a great ongoing interest in two-dimensional Metamaterials (Metasurfaces). Metasurfaces are two dimensional periodic structures that allow controllable change in the amplitude and phase of the incoming wave upon interaction that allows for designing ultrathin optical components with various functionalities. This can be achieved through optical resonances through the metasurface. These resonances can be achieved either through plasmonic antennae or dielectric resonators. Due to their lossy nature in the optical domain, plasmonic and metallic based metasurfaces can lead to inefficient operation and limit the applicability of such structures. In this work we discuss an all silicon metasurface design using cross-shaped unit cells. This cross design in addition to being polarization insensitive is capable of achieving phase difference from 0 to 2π by optimizing two degrees of freedom and thus offers a promising platform for various metasurface applications. We show through numerical simulations the properties of this polarization independent design and how it can be used for mid-infrared beam steering and lensing applications.
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Mostafa Abdelsalam, Ahmed M. Mahmoud, and Mohamed Swillam "Polarization-independent dielectric metasurface for mid-infrared applications", Proc. SPIE 10542, High Contrast Metastructures VII, 105421D (21 February 2018); https://doi.org/10.1117/12.2290953
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KEYWORDS
Plasmonics
Dielectrics
Metamaterials
Mid-IR
Silicon
Photonics
Beam steering
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