Broadband Anisotropy in Terahertz Metamaterial With Single-Layer Gap Ring Array

Xia, Liangping; Cui, Hong‐Liang; Zhang, Man; Dang, Suihu; Du, Chunlei

doi:10.3390/ma12142255

Cited by 4 publications

(2 citation statements)

References 23 publications

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“…A THz region does not have strict borders; however, usually, the range of 0.1 to 100 THz is considered to be the correct region. This has unique advantages, such as strong penetrating power, low energy, and good transient performance [ 1 , 2 ], and has broad application prospects in many fields in terms of high-speed wireless communication [ 3 , 4 ], material detection [ 5 ], biomedical research [ 6 , 7 ], and nondestructive evaluation [ 8 ]. In recent years, with the development of technology, breakthroughs have been made in the research of stable broadband terahertz sources [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Triple-Band and Ultra-Broadband Switchable Terahertz Meta-Material Absorbers Based on the Hybrid Structures of Vanadium Dioxide and Metallic Patterned Resonators

et al. 2023

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A bifunctional terahertz meta-material absorber with three layers is designed. The surface of the bifunctional meta-material absorber is a periodically patterned array composed of hybrid structures of vanadium dioxide (VO2) and metallic resonators; the middle layer is a nondestructive TOPAS film, and the bottom layer is a continuous metallic plane. Utilizing the phase-transition property of VO2, the responses of the meta-material absorber could be dynamically switched between triple-band absorption and ultra-broadband absorption. When VO2 is in the metallic state, an ultra-broadband absorption covering the bandwidth of 6.62 THz is achieved over the range from 4.71 THz to 11.33 THz. When VO2 is in the di-electric state, three absorption peaks resonated at 10.57 THz, 12.68 THz, and 13.91 THz. The physical mechanisms of the bifunctional meta-material absorber were explored by analyzing their near-field distributions. The effects of varying structural parameters on triple-band and ultra-broadband absorption were investigated. It is revealed that by optimizing the structure parameters, the number of absorption peaks could be increased for a certain sacrifice of absorption bandwidth. FDTD Solutions and CST Microwave Studio were used to simulate the data of the absorber, and similar results were obtained.

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Section: Introductionmentioning

confidence: 99%

Triple-Band and Ultra-Broadband Switchable Terahertz Meta-Material Absorbers Based on the Hybrid Structures of Vanadium Dioxide and Metallic Patterned Resonators

et al. 2023

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“…Secondly, lowpermittivity materials were used to fabricate the substrates of the THz MM biosensor in an effort to minimize induced capacitance and transmission loss. Polyethylene terephthalate (PET) is an ideal flexible MM and a popular electro-optical substrate for various THz biosensor applications due to its low dispersion and loss in the THz range, high optical transparency, good surface smoothness, and simple fabrication of different thicknesses (Chen and Pickwell-MacPherson, 2019;Xia et al, 2019;Hu, et al, 2019;Zheng, et al, 2020;Wang, et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Flexible Terahertz Metamaterial Biosensor for Ultra-Sensitive Detection of Hepatitis B Viral DNA Based on the Metal-Enhanced Sandwich Assay

Wang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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The high sensitivity and specificity of terahertz (THz) biosensing are both promising and challenging in DNA sample detection. This study produced and refined a flexible THz MM biosensor for ultrasensitive detection of HBV in clinical serum samples based on a gold magnetic nanoparticle-mediated rolling circle amplification (GMNPs@RCA) sandwich assay under isothermal conditions. Typically, solid-phase RCA reactions mediated by circular padlock probes (PLPs) are triggered under isothermal conditions in the presence of HBV DNA, resulting in long single-stranded DNA (ssDNA) with high fidelity and specificity. Then, the resultant ssDNA was conjugated with detection probes (DPs) immobilized on gold nanoparticles (DP@AuNPs) to form GMNPs-RCA-AuNPs sandwich complexes. The HBV DNA concentrations were quantified by introducing GMNPs-RCA-AuNPs complexes into the metasurface of a flexible THz metamaterial-based biosensor chip and resulting in a red shift of the resonance peak of the THz metamaterials. This biosensor can lead to highly specific and sensitive detection with one-base mismatch discrimination and a limit of detection (LOD) down to 1.27E + 02 IU/ml of HBV DNA from clinical serum samples. The HBV DNA concentration was linearly correlated with the frequency shift of the THz metamaterials within the range of 1.27E + 02∼1.27E + 07 IU/ml, illustrating the applicability and accuracy of our assay in real clinical samples. This strategy constitutes a promising THz sensing method to identify virus DNA. In the future, it is hoped it can assist with pathogen identification and clinical diagnosis.

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Ultrabroadband vanadium-dioxide-based metamaterial absorber based on two resonance modes at a terahertz frequency

Zou¹,

Lin²,

Wu³

et al. 2023

J. Opt. Soc. Am. B

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A terahertz (THz) ultrabroadband metamaterial absorber consisting of a periodically patterned vanadium dioxide (VO2) array, loss-free dielectric layer, and a continuous gold film is designed. Its resonance features can be dynamically tuned by applying different temperatures to the VO2 to promote phase transformation. When the VO2 is in the metallic state, the designed metamaterial has an absorption bandwidth of 6.08 THz with an absorptivity more than 90%, from 3.84 THz to 9.92 THz. The broadband absorption is attributed to the combination of two absorption peaks localized at 4.73 THz and 9.05 THz that are based on the localized resonance mode and surface lattice resonance mode. Taking advantage of the temperature phase transition of VO2, the designed absorber can be switched between ultrabroadband absorption and near-total reflection. Its maximum modulation depth can reach 99%, and it achieves an excellent modulation effect with a bandwidth of about 6 THz. The physical mechanism of the ultrabroadband absorption is discussed through an analysis of the near-field distribution and the current density distribution of the absorption peaks. The effect of structural parameters on the absorption are also investigated. The designed metamaterial absorber could have application potential in THz imaging, THz communications and smart devices.

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Broadband Anisotropy in Terahertz Metamaterial With Single-Layer Gap Ring Array

Cited by 4 publications

References 23 publications

Triple-Band and Ultra-Broadband Switchable Terahertz Meta-Material Absorbers Based on the Hybrid Structures of Vanadium Dioxide and Metallic Patterned Resonators

Triple-Band and Ultra-Broadband Switchable Terahertz Meta-Material Absorbers Based on the Hybrid Structures of Vanadium Dioxide and Metallic Patterned Resonators

Flexible Terahertz Metamaterial Biosensor for Ultra-Sensitive Detection of Hepatitis B Viral DNA Based on the Metal-Enhanced Sandwich Assay

Ultrabroadband vanadium-dioxide-based metamaterial absorber based on two resonance modes at a terahertz frequency

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