Tunable dual-broadband terahertz metamaterial absorber based on a simple design of slotted VO2 resonator

Ri, Kwang-Jin; Ri, Chung-Ho

doi:10.1016/j.optcom.2023.129377

Cited by 11 publications

(5 citation statements)

References 45 publications

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“…As shown in Fig. 7(a), at f 1 = 2.34 THz, positive and negative charges are mainly distributed on the inner graphene disk and the outer part around the slots, thus generating the surface plasmon polariton resonance at the polyimide/graphene interface [23], [47]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 98%

“…7(b), at f 2 = 3.52 THz, positive and negative charges are distributed in the upper and lower parts of complementary split ring-shaped graphene. Consequently, the ultrabroadband absorption originates from the surface plasmon polariton resonances excited by the surface charges of complementary split ring-shaped graphene [23], [47], [52], [53].…”

Section: Resultsmentioning

confidence: 99%

“…To further enlarge the absorption bandwidth, another polyimide layer was added to the top of the absorber structure mentioned above as an overlayer. Such a con guration has already been considered as an effective way to expand the absorption band [23], [24], [55]. Figure 9(a)…”

Section: Resultsmentioning

confidence: 99%

“…However, most of the reported THz metamaterial absorbers suffer from some disadvantages of the xed working frequency band and the absorption level. To overcome these drawbacks, several phase change materials [19]- [24] and graphene [25]- [27] have been widely utilized for achieving the tunable THz metamaterial absorbers.…”

Section: Introductionmentioning

confidence: 99%

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Tunable Ultra-Broadband Terahertz Metamaterial Absorbers Based on Complementary Split Ring-Shaped Graphene

Ri,

Kim,

2023

Preprint

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In the design of tunable broadband terahertz (THz) metamaterial absorbers based on graphene, simplifying the gating structure to control the Fermi energy of graphene is urgently required for practical applications. Pursuing this demand, we propose two kinds of tunable ultra-broadband THz metamaterial absorbers based on complementary split ring-shaped graphene. The first absorber can achieve an ultra-broadband absorption performance with absorptivity above 90% in the range of 2.06–4.24 THz and its relative absorption bandwidth is 69.2%. By varying the Fermi energy of graphene from 0 eV to 0.8 eV via bias voltage, the absorptivity can be dynamically tuned from 32.8–99.9%. The physical mechanism of ultra-broadband absorption is based on the surface plasmon polariton resonances excited by the surface charges of complementary split ring-shaped graphene. In addition, to further expand the absorption bandwidth, the first absorber structure is covered with another dielectric layer, resulting in the second absorber with enhanced relative absorption bandwidth of 108.27%. Our designed absorbers have many potential applications such as medical imaging, explosive detection, biological sensing and wireless communications.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tunable Ultra-Broadband Terahertz Metamaterial Absorbers Based on Complementary Split Ring-Shaped Graphene

Ri,

Kim,

2023

Preprint

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“…Therefore, researchers have utilized phase change materials such as VO 2 and graphene, among others, to engineer terahertz devices with multifunctionality. Vanadium dioxide (VO 2 ) serves as a foundational material undergoing a remarkable transition from an insulating phase to a metallic phase at 68 • C [40][41][42][43][44][45]. This phase transition results in a significant alteration in electrical conductivity.…”

Section: Introductionmentioning

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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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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Tunable dual-broadband terahertz metamaterial absorber based on a simple design of slotted VO2 resonator

Cited by 11 publications

References 45 publications

Tunable Ultra-Broadband Terahertz Metamaterial Absorbers Based on Complementary Split Ring-Shaped Graphene

Tunable Ultra-Broadband Terahertz Metamaterial Absorbers Based on Complementary Split Ring-Shaped Graphene

Conversion and Active Control between BIC and Absorber in Terahertz Metasurface

Dielectric‐Based Metamaterials for Near‐Perfect Light Absorption

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