Flexible Manipulation of Bessel‐Like Beams with a Reconfigurable Metasurface

Abstract

Bessel beams have attracted considerable interest due to their intriguing nondiffraction and self‐healing properties. Such beam can be generated by conventional devices that are more or less subjected to issues of low efficiency, complex manufacturing, and bulky size. Here, an electronically engineered reflective metasurface is designed to generate and flexibly manipulate Bessel‐like beams over a broad frequency range in the microwave regime. Due to the dynamic resonance feature of the metasurface, the phase profile can be easily adjusted for different applications. The nondiffraction feature is illustrated by analyzing several configurations with different nondiffraction area of the Bessel‐like beam, while the self‐healing property is verified by placing a metallic obstacle in the propagation path. The dynamic control of functional frequency and propagation direction of Bessel‐like beams is realized by controlling the external DC bias voltage applied to the metasurface. Experimental validation of the aforementioned features is perfectly consistent with numerical simulations. Owing to the flexible control, broad bandwidth, and high‐efficiency properties, the proposed Bessel‐like beam generator suggests potential applications in microwave domain such as focusing, wireless power transmission, and other complex demands such as beam steering.

Multidimensionally Manipulated Active Coding Metasurface by Merging Pancharatnam–Berry Phase and Dynamic Phase

“…[20] By introducing active materials into the metasurface, diversified functionalities can be achieved rapidly and effectively. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] More importantly, this concept opens a new door to connect metasurfaces with the field of information science. Programmable CMs [20][21][22][23] are realized by introducing positive-intrinsic-negative (PIN) diode to dynamically control EM waves.…”

“…[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] More importantly, this concept opens a new door to connect metasurfaces with the field of information science. Programmable CMs [20][21][22][23] are realized by introducing positive-intrinsic-negative (PIN) diode to dynamically control EM waves. Different functionalities can be achieved in a single CM, and these functionalities can be switched in real-time by dynamically changing the coding sequences.…”

“…Metasurfaces, a 2D form of metamaterials, have made rapid development with the advantages of powerful ability to manipulate EM waves and the advantages of compact size, low loss, easy manufacture. [ 3–37 ] The proposal of the generalized Snell's laws [ 3 ] leads to the unprecedented development of metasurface, and many fascinating phenomena are achieving, such as random diffusions, [ 4–6 ] orbital angular momentum, [ 7 ] beam deflection, [ 8–11 ] vortex beams, [ 12–14 ] wavefront manipulation, [ 15–17 ] and holograms. [ 18–19 ]…”

Ultra-Thin Chiral Metasurface-Based Superoscillatory Lens

“…A Metasurface is a novel artificial thin two-dimensional artificial material consisting of subwavelength elements, which provides a powerful platform to manipulate the EM wave with high degrees of freedom (Holloway et al, 2012;Yu and Capasso, 2014). Thanks to the years of painstaking research of scientists, many great achievements have been obtained, such as orbital angular momentum (OAM) beam generators (Pu et al, 2015;Bi et al, 2018;Zhang et al, 2018;Wang Y. et al, 2020), vector vortex beam generators (Yue et al, 2016;Zuo et al, 2018;Zhuang et al, 2019;Bao et al, 2020), holograms (Zheng et al, 2015;Wang et al, 2018;Wang et al, 2019;Ding et al, 2020), optical computation (Lin et al, 2018;Li et al, 2019;Abdollahramezani et al, 2020;Lou et al, 2020;Qian et al, 2020), reconfigurable metasurfaces (Ratni et al, 2018;Feng et al, 2020a;Feng et al, 2020b;Ratni et al, 2020;De Lustrac et al, 2021;Popov et al, 2021), multifunctional metasurfaces (Yuan et al, 2019;Zhang et al, 2019;Yuan et al, 2020a;Yuan et al, 2020b;Yuan et al, 2020c;Guan et al, 2020), and superoscillatory lens (Huang et al, 2014;Tang et al, 2015;Qin et al, 2017;Li et al, 2018;Li et al, 2021), etc. Besides, there are still many potential theories and applications that need to be unveiled and exploited.…”

Camouflaging a High‐Index Dielectric Scatterer with Buried Metasurfaces

“…[ 15–17 ] The geometrical parameters of the constitutive elementary cells of an MS, also known as meta‐atoms, can be carefully engineered to achieve specific amplitude and phase profiles, providing access to a wide variety of applications. Over the past decade, a plethora of devices has been theoretically presented and experimentally validated, such as polarization converters, [ 18–20 ] beam formers and deflectors, [ 21–24 ] wide‐angle impedance matching structures, [ 25–26 ] complex wave generators [ 27–30 ] and many more. [ 31 ] MSs have also played an important role in the field of electromagnetic illusion and invisibility cloaking.…”