Recent Progress in Reconfigurable and Intelligent Metasurfaces: A Comprehensive Review of Tuning Mechanisms, Hardware Designs, and Applications (Adv. Sci. 33/2022)

Saifullah, Yasir; He, Yejun; Boag, Amir; Yang, Guo‐Min; Xing, Feng

doi:10.1002/advs.202270210

Cited by 12 publications

(6 citation statements)

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“…Electrically tunable metasurfaces are preferred for practical applications compared to other tuning technologies, such as mechanical [ 32–34 ] or microfluidic [ 35,36 ] approaches, due to their fast switching/tuning speed. [ 37–39 ] Although they have been demonstrated previously, a single metasurface capable of fully controlling amplitude, phase, polarization, and angular frequency has not been reported. Metasurface functionality is limited by the designed ability to completely control the full electromagnetic waves parameters simultaneously and independently.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability

Phon

Lee

Lor

et al. 2023

Advanced Optical Materials

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The capability to dynamically modulate electromagnetic wavefronts can revolutionize and be crucial for future wireless technology. Electromagnetic waves can be fundamentally described in terms of amplitude, phase, polarization, and angular frequency. However, reported reconfigurable metasurfaces can only control one or two fundamental parameters and require different tuning/switching elements or materials that remain challenging to control those continuously. In this work, an approach is presented for designing electrically tunable reflective metasurfaces that enable independent and simultaneous control of amplitude and phase, while also providing frequency tuning capability. This is achieved by arranging two varactor diodes on the top layer and a lumped resistor on the bottom layer. The proposed metasurface is fabricated and several electromagnetic functionalities experimentally demonstrated as proof‐of‐concept applications, including reflector, radar absorbing, dual and single‐beam steering, and amplitude control. The proposed metasurface will open avenues for realizing advanced multifunctional devices to fully control electromagnetic parameters, offering numerous applications in future communication technologies, radar systems, and information processing.

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Section: Introductionmentioning

confidence: 99%

Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability

Phon

Lee

Lor

et al. 2023

Advanced Optical Materials

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“…By employing a tunable meta‐atom driven by thermal, [ 9,10 ] optical, [ 11,12 ] electrical, [ 13–15 ] or mechanical methods, [ 16,17 ] the reconfigurable metasurface can change the propagation amplitude, phase, or polarization of EM waves in real time, performing the outstanding capability of dynamic wave manipulation. [ 18–20 ] In the microwave region, active components such as varactor diodes and PIN switches are generally adopted into meta‐atom, [ 21–25 ] which have constructed a variety of fascinating metadevices, including beam steering antenna, [ 22 ] switchable polarizer, [ 24 ] and reconfigurable cloak. [ 25 ] In addition, some advanced materials, including liquid crystal and graphene, can also provide tunable or switchable functionalities when incorporated into metasurfaces.…”

Section: Introductionmentioning

confidence: 99%

An Intelligent Metasurface for Self‐Adaptive Electromagnetic Manipulation of Transmission/Absorption Frequency and Amplitude

She,

Ji,

Huang

et al. 2023

Advanced Optical Materials

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Intelligent metasurfaces have recently attracted much interest due to their strong capability of self‐adaptive electromagnetic (EM) manipulation. However, their realization still faces great challenges, especially in the recognition and modulation of multi‐EM parameters. Here, an intelligent metasurface is proposed that can automatically manipulate its transmission/absorption frequency and amplitude to adapt to the complicated and ambiguous EM environment. By integrating a radio‐frequency sensing module and a closed‐loop feedback system, the incident wave frequency and amplitude information can be recognized and then the corresponding instruction will be generated to make such a metasurface achieve the predefined EM functions. Experimental results have demonstrated that it can realize the dynamic switching between transmission and absorption with the variation of incident power intensity, and meanwhile the transmission/absorption amplitude can be also further adjusted. In addition, this metasurface possesses the frequency‐agile capability, which can self‐adaptively control its transmission/absorption frequency to match the incident frequency. The proposed approach opens a new avenue to promote the development of multifunctional intelligent metasurfaces toward a wide range of real‐time application fields, such as smart EM windows and active camouflage.

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“…Metasurfaces have gone through several stages of development, from passive to active, from static to dynamic, and from DOI: 10.1002/admt.202301111 manual control to adaptive functionality, [1,2] giving rise to related concepts such as digital metasu rfaces, [3][4][5][6] programmable metasurfac es, [7][8][9][10] reconfigurable metasurfac es, [11][12][13] and intelligent (or called smart) metasurfaces. [14][15][16][17] These artificial structures are playing increasingly important roles in both military and civilian scenarios, accomplishing the function of communication, [9] electromagnetic (EM) protection, [15][16][17] imaging, [18][19][20] anomalous reflection, [21,22] and beyond.…”

Section: Introductionmentioning

confidence: 99%

Fabric‐Based Smart Metasurface

Chen,

Lu,

Geng

et al. 2023

Adv Materials Technologies

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Fabric presents several advantages including excellent flexibility, lightweight, bend resilience, breathable properties, and significant price advantage compared to commercial low‐loss boards, providing a natural advantage for the preparation of flexible electromagnetic (EM) devices and wearable systems. A key challenge when using fabric as the substrate for active devices lies in the contradiction between the poor high‐temperature resistance of fabric materials and the welding requirements for semiconductor components, leading to a significant gap between flexible and traditional RF technology. Benefiting from the unique fiber structure of fabric materials, a conjecture is creatively proposed for integrating lumped components onto fabric substrates through the sewing method and successfully verifying its validity and stability. As an application, a fabric‐based smart metasurface (FSM) is designed and realized for potential portable EM protection applications. The proposed FSM has the advantage of good flexibility, low cost, and a high strength‐to‐weight ratio. By carefully designing the structure of the metasurface and also the sensing module, large‐angle stable EM performance is achieved, and the FSM can function well even under highly distorted conditions. The proposed method and product inspire promising application aspects in wearable electronics, portable EM protection, and related flexible RF technologies.

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Recent Progress in Reconfigurable and Intelligent Metasurfaces: A Comprehensive Review of Tuning Mechanisms, Hardware Designs, and Applications (Adv. Sci. 33/2022)

Cited by 12 publications

References 0 publications

Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability

Multifunctional Reflective Metasurface to Independently and Simultaneously Control Amplitude and Phase with Frequency Tunability

An Intelligent Metasurface for Self‐Adaptive Electromagnetic Manipulation of Transmission/Absorption Frequency and Amplitude

Fabric‐Based Smart Metasurface

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