Meta-waveguide for customizable energy equalization

Wang, Zhigang; Jin, Huizhen; Sun, Xiaofeng; Xi, Li; Yang, Xu; Liu, Gang; Gong, Cheng

doi:10.1016/j.optcom.2020.126172

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…The metallic gap of the I-shaped resonator forms an equivalent gap capacitor, enhancing the resonance effect. To improve the I-shaped resonator's performance in absorbing and manipulating electromagnetic waves, a resistive loss material is added to the metallic gap [29]. The added loss material is a TaN thin-film resistor with a resistance R 0 of 50 or 100 ohms in a square shape of any size.…”

Section: Principle and Designmentioning

confidence: 99%

“…In recent years, a variety of metamaterial waveguides have been proposed to achieve different functionalities and applications, including waveguide filters [28], a customizable equalizer [29], terahertz waveguide modulators [30], a susceptible permittivity sensor [31], and light storage [32]. These studies have brought promising prospects to the field of metamaterial waveguides.…”

Section: Introductionmentioning

confidence: 99%

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Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation

Yang

Song

et al. 2023

Photonics

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In terahertz communication systems, amplifiers and other components can induce non-linear distortion in terms of amplitude and phase, resulting in system performance degradation. This paper presents a terahertz metamaterial waveguide to mitigate amplitude and phase distortions in some terahertz systems. A simple method based on free-space analysis is proposed for designing metamaterial waveguides in an enclosed space. The quasi-periodic metamaterial structures, which feature I-shaped resonant patterns, are integrated onto the inner walls of rectangular waveguides. The phase and amplitude of electromagnetic waves within the waveguide can be modulated by varying the dimensions and number of these resonators. Utilizing the effective medium theory and the equivalent circuits, the metamaterial waveguide’s phase and absorption modulation mechanisms are analyzed. Based on the proposed structure, a metamaterial waveguide with I-shaped resonators is designed and fabricated, and its abilities to modulate the phase and absorption of terahertz waves around 0.2 THz are demonstrated.

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Section: Principle and Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation

Yang

Song

et al. 2023

Photonics

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“…However, integrated EBG structure is difficult to position and bond for FWG-SWS. Zhigang et al proposed a meta-waveguide which can achieve frequency-selective attenuation in close space waveguide [27]. The proposed meta-waveguide was applied as a gain equalizer to improve gain flatness [28].…”

Section: Introductionmentioning

confidence: 99%

Backward-Wave Oscillation Suppression in Folded Waveguide Traveling-Wave Tube With Metamaterial Absorber

et al. 2023

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A D-band folded waveguide (FWG) traveling-wave tube (TWT) with metamaterial absorber (MMA) is proposed, where the MMA is designed to suppress the backward oscillation in this FWG-TWT. The MMA consists of single splitter rings (SRs) with silica layer that adheres to the inner surface of a metallic waveguide. The absorption frequency of this MMA is well designed to cover the backward frequency of FWG slow wave structure (SWS). Therefore, this MMA achieves the transmission of forward wave and the attenuation of backward wave, which improves the performance of FWG-TWT. Simulation results show that 66.1 W saturated output power driven by 5 mW 150GHz input signal, with a corresponding gain of 41.2 dB, and a bandwidth of 18 GHz with output power greater than 40 W can be achieved with 90 periods SWS. The proposed FWG-TWT with MMA may provide a high gain for high frequency amplifier, where it is helpful to design an FWG-TWT with low input power. INDEX TERMSTraveling-wave tube, folded waveguide, beam-wave interaction, backward-wave oscillation, metamaterial absorber.

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“…超表面作为一种集成化的人工周期阵列结构, 其电磁特性可以通过结构单元的几何设计和材料选择进行定制, 从而实现自然界不具备的电磁特性, 突破了太赫兹器件的设计局限, 推动了太赫兹科学的飞速发展. 通过超表面技术在太赫兹频段已经实现了完美吸收器 [11,12] 、超透镜 [13,14] 与超波导 [15,16] 等高性能器件.…”

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Nano-printing technology based double-spiral terahertz tunable metasurface

于博¹,

庄书磊²,

王正心³

et al. 2022

Acta Phys. Sin.

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Electromagnetic devices made of artificially constructed metasurfaces can achieve filtering, modulation, sensing, and detection functions in the terahertz frequency band, which is essential for the application of terahertz waves in the fields of communication and imaging. We designed and prepared a flexible and transparent double helix metasurface based on nano-printing technology, and used the metasurface to construct a rotating tunable filter, which can achieve regular tuning of the terahertz wave transmittance by rotating the metasurface. After rotating by 90°, the transmittance at 0.52THz increased from 8% to 67%, and the transmittance at 0.92THz decreased from 68% to 3%, realizing active tuning with modulation depth greater than 88%. Moreover, the proposed Nano-printing metasurfaces have excellent properties of ultra-thinness, flexibility, and visible light transparency, which is conducive to the miniaturization, light-weight and large-area preparation of terahertz tunable devices.

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Meta-waveguide for customizable energy equalization

Cited by 9 publications

References 21 publications

Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation

Terahertz Metamaterial Waveguide with I-Shaped Resonators for Phase and Absorption Modulation

Backward-Wave Oscillation Suppression in Folded Waveguide Traveling-Wave Tube With Metamaterial Absorber

Nano-printing technology based double-spiral terahertz tunable metasurface

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