Transmissive focusing meta-surface with nearly 100% efficiency

Lin, Bi-Cheng; Wang, G.-M.; Cai, Tong

doi:10.1007/s00339-017-1254-1

Cited by 12 publications

(3 citation statements)

References 29 publications

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“…Few‐layer metasurfaces can not only realize the beam deflectors, but also realize the metalenses, vortex beam generators, Bessel‐beam generators, coding metasurfaces, phase holograms, virtual shaping, and some other phase manipulation devices. Metalenses can be designed by imposing a hyperboloidal transmission/reflection phase profile on the metasurfaces to convert incident planar wavefronts into spherical ones .…”

Section: Prominent Applications In Few‐layer Metasurfacesmentioning

confidence: 99%

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Chen

Zhang

et al. 2019

Advanced Optical Materials

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applications have been realized based on the metamaterials, such as negative index materials, [3] invisibility cloaks, [4] and zeroindex materials. [5] Nevertheless, metamaterials are usually bulky, difficult to be fabricated, and suffer from high energy losses, which hinder their practical applications in modern photonic systems. In recent years, planar metasurfaces, the 2D equivalents of metamaterials, have attracted plenty of attentions due to their extraordinary abilities in controlling the polarization, amplitude, phase, and dispersion of electromagnetic waves. [6][7][8] Compared with bulk metamaterials, the metasurfaces have many advantages, such as ultrathin thicknesses, low losses, ease of fabrication and integration. Over the past years, single-layer metasurfaces have been widely applied in realizing polarization conversion, [9] beam deflectors, [10,11] metalenses, [12,13] holograms, [14] coding, [15] structural colors, [16,17] nonlinear metasurfaces, [18] and some other applications. Nevertheless, the interactions between lights and ultrathin single-layer metasurfaces are usually limited, resulting in low efficiency and limited controllability in some applications. [19] Moreover, the degrees of freedom for light manipulation provided by a single-layer metasurface are usually not enough in realizing multifunctional devices and some other sophisticated photonic systems.Few-layer metasurface that contains more than one functional layer provides an effective method to overcome the drawbacks of both bulk metamaterials and single-layer metasurfaces. Cheng et al. employed the concept of few-layer metasurfaces to discuss the advantages and emergent functionalities of them in ref. [20]. Few-layer metasurfaces retain the advantages of single-layer metasurfaces and can provide more degrees of freedom to manipulate electromagnetic waves. More importantly, the abundant layer effects, such as the multiple wave interference between layers and the near-field coupling effects, can enhance the interactions between lights and structures and improve the efficiency of few-layer systems. In addition, the combination of different functional layers can produce novel functions that single-layer metasurfaces can hardly realize. For example, by breaking the mirror symmetry along the propagation direction, few-layer metasurfaces can realize asymmetric transmission of linearly polarized lights. [21] By vertically integrating different metasurfaces on one substrate, optical systems with different functions can be miniaturization and integration. Recently, the few-layer metasurfaces have also been extended in the acoustic fields to realize some novel applications, such Metamaterials are 3D artificial structures proposed to surpass conventional natural materials and realize novel functions beyond traditional optical elements. Nevertheless, they are usually bulky and difficult to be fabricated. As 2D equivalents of metamaterials, metasurfaces have been proposed to overcome the drawbacks of metamaterials and fully control the polarizati...

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Section: Prominent Applications In Few‐layer Metasurfacesmentioning

confidence: 99%

Empowered Layer Effects and Prominent Properties in Few‐Layer Metasurfaces

Chen

Zhang

et al. 2019

Advanced Optical Materials

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“…Solving Maxwell equations to analyse the interaction of electromagnetic fields with components implemented in layered media is of great importance for analysing various problems. Applications of this structure include patch antennas [1][2][3][4], waveguides [5][6][7][8][9], microwave components [10,11], filters [12][13][14][15], absorbers [16,17] etc. The time-domain mixed potential integral equation [18][19][20][21] can be used for transient analysis of the electromagnetic waves in stratified media, which requires the calculation of time-domain Green's functions (TDGFs).…”

Section: Introductionmentioning

confidence: 99%

An efficient and highly accurate singularity extraction method for the evaluation of transient potentials of stratified media

Sahafi

Ghaffari‐Miab

Souri

2023

IET Microwaves Antenna & Prop

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An efficient and highly accurate method for extracting the singularity of scalar potential time‐domain Green's function (TDGF) of layered media is presented. The proposed method is based on the Taylor series expansion and is exploited in the finite‐difference (FD) technique. The presented method is accurate for the singularity behavior of the potential near the source. Also, the effect of singularity extraction box size on the calculation error of Green's functions is explained. Numerical results demonstrating the accuracy of the proposed singularity extraction method for calculating the TDGF of a PEC‐backed dielectric slab are presented. It is shown that the accuracy of the evaluated TDGF is improved by an order of magnitude using the proposed singularity extraction technique. Also, the effect of changing the spatial and temporal steps of the FD scheme on the calculation error is studied.

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“…Reflecting metasurfaces can be efficiently used as focusing reflectors for antennas. This metasurface can be realized with be made with metal [4] or dielectric [5] inclusions. Last years water attracts more attention as a promising dielectric material for the metasurfaces [6]- [8].…”

Section: Introductionmentioning

confidence: 99%