2016/05/23 by Ata Chizari, Sajjad Abdollahramezani, Sajjad AbdollahRamezani +2
Engineering · Materials Science · Physics and Astronomy · #Advanced Antenna and Metasurface Technologies #Amplitude #Broadband #Dielectric #Differentiator #Integrator #Metamaterials and Metasurfaces Applications #Phase (matter) #Phase modulation #Planar #Plasmon #Plasmonic and Surface Plasmon Research #Polarization (electrochemistry) #physics.optics
paper · pdf · doi:10.1364/ol.41.003451
arxiv created 2016/05/23 · openalex created_date 2016/06/24 · openalex publication_date 2016/07/20 · arxiv updated 2016/08/24 · openalex updated_date 2026/08/05
In this Letter, we realize the concept of analog computing using an engineered gradient dielectric meta-reflect-array. The proposed configuration consists of individual subwavelength silicon nanobricks, in combination with a fused silica spacer and silver ground plane, realizing a reflection beam with full phase coverage of 2π degrees, as well as an amplitude range of 0 to 1. Spectrally overlapping electric and magnetic dipole resonances, such high-index dielectric metasurfaces can locally and independently manipulate the amplitude and phase of the incident electromagnetic wave. This practically feasible structure overcomes substantial limitations imposed by plasmonic metasurfaces such as absorption losses and low polarization conversion efficiency in the visible range. Using such CMOS-compatible and easily integrable platforms promises highly efficient ultrathin planar wave-based computing systems that circumvent the drawbacks of conventional bulky lens-based signal processors. Based on these key properties and the general concept of spatial Fourier transformation, we design and realize broadband mathematical operators such as the differentiator and integrator in the telecommunication wavelengths.