Abdelsalam Mostafa, Mahmoud Ahmed M, Swillam Mohamed A
Department of Physics, School of Sciences and Engineering, The American University in Cairo, Cairo, 11835, Egypt.
Electronics and Communications Engineering Department, The American University in Cairo, Cairo, 11835, Egypt.
Sci Rep. 2019 Jul 25;9(1):10824. doi: 10.1038/s41598-019-47097-5.
Over the past years, metasurfaces have been of great interest due to their ability manipulate optical wavefront by introducing a phase gradient across the transverse directions of the wave. This phase gradient was usually realized using plasmonic resonators which had high intrinsic losses. Here, we demonstrate, numerically, a proof of principle of an all-dielectric silicon based metasurface at the infrared (IR) range that manipulates the wave front and achieves beam steering with significantly high transmission. The proposed cross-shaped unit cell design shows high transmission with the ability to fully control the phase of the transmitted wave from 0 to 2π. The metasurface is made of silicon cross resonators, arranged to have a linear phase gradient, on SiO substrate which makes the device compatible with most standard semiconductor fabrication techniques.
在过去几年中，超表面因其能够通过在波的横向引入相位梯度来操纵光波前而备受关注。这种相位梯度通常是利用具有高固有损耗的等离子体谐振器来实现的。在此，我们通过数值模拟证明了一种基于全介质硅的红外（IR）波段超表面的原理验证，该超表面能够操纵波前并实现具有显著高透射率的光束转向。所提出的十字形单元结构设计具有高透射率，并且能够将透射波的相位从0到2π进行完全控制。该超表面由硅十字谐振器制成，在SiO衬底上排列成具有线性相位梯度，这使得该器件能够与大多数标准半导体制造技术兼容。
