Tunable multiband metamaterial coherent perfect absorber based on graphene and vanadium dioxide

Xiong, Ting-Hui; Zhao, Kai; Li, Wei; Peng, Yaoli; He, Meng-Dong; Wang, Kaijun; Zhang, Xinmin; Li, Jianbo; Liu, Jianqiang

doi:10.1016/j.optcom.2022.128691

Cited by 7 publications

(1 citation statement)

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“…Switching and tunable wideband terahertz absorption based on graphene and vanadium dioxide has been achieved using thermal evaporation systems, spin coating and ground curing processes, magnetron sputtering, and wet transfer techniques [55]. Using atomic layer deposition (ALD) technology and lithographic electron beam lithography (EBL) technology, EBL technology has achieved a tunable multi-band metamaterial coherently perfect absorber based on graphene and vanadium dioxide [56]. With the continuous maturity and improvement of processing technology, terahertz devices with multiple functions can be successfully processed, laying the foundation for the future sustainable development of multifunctional devices.…”

Section: Discussionmentioning

confidence: 99%

Conversion and Active Control between BIC and Absorber in Terahertz Metasurface

Xi,

Chen

2024

Photonics

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A multifunctional switchable metamaterial device based on graphene, a gold layer, polyimide, vanadiµm dioxide (VO2), and the sapphire substrate is designed in this paper. The top layer consists of a gold wire, graphene, and two split-ring resonators with the same parameters. By adjusting the Fermi level of graphene, the regulation of BIC and quasi-BIC is realized, and the conversion between BIC and absorber is realized by adjusting the conductivity of VO2. When the device is converted into a wave-absorbing device with single-band absorption characteristics, the Fermi level of graphene at this time is 0.001 eV, the absorption peak at 0.820 THz is higher than 99.5%, and when the Fermi level of regulated graphene is 1 eV, the absorption peak at 0.667 THz is also higher than 99.5%. The peak frequency of the device is 0.640 THz when it converts to quasi-BIC. To the best of our knowledge, this is the first time that the conversion and regulation of BIC and absorber have been achieved using these two phase change materials. Moreover, by adjusting the parameters of the metamaterial structure, the working efficiency and frequency of BIC and absorber can be dynamically adjusted. The electric field distribution and surface current of metamaterials are further studied, and the physical mechanism of effective absorption and BIC is discussed. These results show that the metamaterials proposed in this paper have many advantages, such as terahertz absorption, BIC, and active device control, and are of great significance for developing terahertz multifunctional devices.

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Section: Discussionmentioning

confidence: 99%

Conversion and Active Control between BIC and Absorber in Terahertz Metasurface

Xi,

Chen

2024

Photonics

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Dielectric‐Based Metamaterials for Near‐Perfect Light Absorption

Wang,

Qin,

Duan

et al. 2024

Adv Funct Materials

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The emergence of metamaterials and their continued prosperity have built a powerful working platform for accurately manipulating the behavior of electromagnetic waves, providing sufficient possibility for the realization of metamaterial absorbers with outstanding performance. However, metamaterial absorbers composed of metallic materials typically possess many unfavorable factors, such as non‐adjustable absorption, easy oxidation, low‐melting, and expensive preparation costs. The selection of dielectric materials provides excellent alternatives due to their remarkable properties, thus dielectric‐based metamaterial absorbers (DBMAs) have attracted much attention. To promote breakthroughs in DBMAs and guide their future development, this work systematically and deeply reviews the recent research progress of DBMAs from four different but progressive aspects, including physical principles; classifications, material selections and tunable properties; preparation technologies; and functional applications. Five different types of theories and related physical mechanisms, such as Mie resonance, guided‐mode resonance, and Anapole resonance, are briefly outlined to explain DBMAs having near‐perfect absorption performance. Mainstream material selections, structure designs, and different types of tunable DBMAs are highlighted. Several widely utilized preparation methods for customizing DBMAs are given. Various practical applications of DBMAs in sensing, stealth technology, solar energy absorption, and electromagnetic interference suppression are reviewed. Finally, some key challenges and feasible solutions for DBMAs’ future development are provided.

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