Large-scale transmission-type multifunctional anisotropic coding metasurfaces in millimeter-wave frequencies

Cui, Tie Jun; Wu, Rui Yuan; Wu, Wei; Shi, Chuan; Li, Yun Bo

doi:10.1088/1361-6463/aa85bd

Cited by 29 publications

(22 citation statements)

References 36 publications

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“…Nowadays, three types of imaging systems are widely utilized, i.e. the real-aperture (RA) system [68], the synthetic-aperture (SA) system [69] and the aperture-coded computational imager [70][71][72][73][74][75][76][77][78][79][80][81][82][83]. The RA system is composed of massive antenna elements in a large aperture, which is more flexible in measurement modes but suffers from the big size, heavy weight, high power and high expense of hardware.…”

Section: Programmable Imagermentioning

confidence: 99%

Information metamaterials – from effective media to real-time information processing systems

Cui

2019

Nanophotonics

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Metamaterials have been characterized by effective medium parameters over the past decades due to the subwavelength nature of meta-atoms. Once the metamaterials are fabricated, their functions become fixed or tunable. Recently, the concept of digital metamaterials has been introduced, in which, for instance, the constitutive 1-bit meta-atom is digitalized as “0” or “1” corresponding to two opposite electromagnetic (EM) responses. The digital metamaterials set up a bridge between the physical world and the information world. More interestingly, when the digital meta-atom is programmable, a single metamaterial can be used to realize different functions when programmed with different coding sequences. Moreover, as the states of programmable meta-atoms can be quickly switched, it enables the wave-based information coding and processing on the physical level of metamaterials in real time. For these reasons, we prefer to call digital metamaterials with programmable meta-atoms as “information metamaterials.” In this review article, we introduce two basic principles for information metamaterials: Shannon entropy on metamaterials to measure the information capacity quantitatively and digital convolution on metamaterials to manipulate the beam steering. Afterwards, two proof-of-concept imaging systems based on information metamaterials, i.e. programmable hologram and programmable imager, are presented, showing more powerful abilities than the traditional counterparts. Furthermore, we discuss the time-modulated information metamaterial that enables efficient and accurate manipulations of spectral harmonic distributions and brings new physical phenomena such as frequency cloaking and velocity illusion. As a relevant application of time-modulated information metamaterials, we propose a novel architecture of wireless communication, which simplifies the modern wireless communication system. Finally, the future trends of information metamaterials are predicted.

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Section: Programmable Imagermentioning

confidence: 99%

Information metamaterials – from effective media to real-time information processing systems

Cui

2019

Nanophotonics

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“…Based on the principle of cascading multiple layers, a transmission unit with a full phase range generally needs a minimum of four layers of metal. [ 15,48 ] Some special methods must be applied to the unit design with three layers to achieve a full transmission phase range, and it is hard to design multiplexing. [ 45 ] At the same time, designing the unit with four‐conductor layer is more reliable because it has a design margin according to the principle.…”

Section: Algorithm and Metasurface Unit Designmentioning

confidence: 99%

Polarization Multiplexing Hologram Realized by Anisotropic Digital Metasurface

Yan

Sun

et al. 2021

Advcd Theory and Sims

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Metasurface holograms have the potential to be applied in a variety of practical fields. Here an anisotropic digital metasurface is proposed that can project polarization multiplexing patterns at the microwave frequency, in which a modified Gerchberg–Saxton algorithm is presented to calculate the phase masks. A 3‐bit coding metamaterial unit is also proposed, which is capable of independently manipulating the transmission phases of orthogonal linearly polarized electromagnetic waves. The influence of wave‐front has been analyzed by comparing two holographic results with distinct source optimization methods. A prototype of the anisotropic digital coding metasurface optimized with horn wave‐front is designed, manufactured, and tested. The experimental measurements present the expected holographic fields and have a good match with the simulation results.

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“…The MS is composed of an M Â N rectangular array of unit cells. The principle for predicting the far-field scattering pattern of the MS follows the antenna array summation [92] Eðθ, φÞ %…”

Section: Phase Modulationsmentioning

confidence: 99%

Metamaterial Lenses and Their Applications at Microwave Frequencies

Tang

Chen

Cui

2021

Advanced Photonics Research

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Metamaterials (MTMs) are artificial structures characterized by flexible and designable electromagnetic (EM) properties, including permittivity, permeability, and refractive index. Because of their subwavelength-scale composing units, MTMs are able to manipulate the propagation of EM waves at extremely fine resolutions and offer solutions for new-concept devices and components with novel functionalities and challenge-breaking properties. From among the attractive applications of MTMs, this review article focuses on MTM lenses (also termed metalenses) developed in recent years for the purpose of microwave engineering, including beam forming, beam steering, and imaging. Bulk lenses made of 3D MTMs and planar lenses made of 2D transmission-type metasurfaces are both involved and investigated. Different categories of metalenses, together with the theory, principles, methods, and advantages of their designs, are introduced and discussed. Potential and future applications of metalenses at microwave frequencies are also presented.

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Large-scale transmission-type multifunctional anisotropic coding metasurfaces in millimeter-wave frequencies

Cited by 29 publications

References 36 publications

Information metamaterials – from effective media to real-time information processing systems

Information metamaterials – from effective media to real-time information processing systems

Polarization Multiplexing Hologram Realized by Anisotropic Digital Metasurface

Metamaterial Lenses and Their Applications at Microwave Frequencies

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