Optically Transparent Frequency-Tunable Microwave Absorber Based on Patterned Graphene-ITO Structure

Zhong, Shun‐Shi; Ma, Yungui

doi:10.1109/tap.2022.3161343

Cited by 19 publications

(17 citation statements)

References 37 publications

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“…In addition, based on the small duty cycle of the patterned VO 2 film and the metallic mesh, FTMAPV can achieve optical transparency in the visible–infrared band. Compared with the previously reported transparent tunable absorbers, ,,,, our designed FTMAPV has the thinnest relative thickness and the widest optical transparency wavelength range. The proposed absorber prototype is a viable solution for ultra-thin frequency-tunable microwave absorbers with broadband optical transparency and has numerous potential applications in optical and intelligent fields.…”

Section: Introductionmentioning

confidence: 83%

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO₂ Film

Zhang,

Lu,

Tan

2023

ACS Appl. Nano Mater.

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Designing an ultra-thin microwave absorber that can simultaneously realize tunable absorption and broadband optical transparency remains a crucial challenge. In this work, we present a visible−infrared transparent ultrathin frequency-tunable microwave absorber based on a nanometer-thick patterned vanadium dioxide (VO 2 ) film. The thermally variable sheet resistance of the nanometer-thick VO 2 film enables different percentages of equivalent resistance in the equivalent impedance of the patterned VO 2 film, which induces the absorbing mode to transform from pure Fabry−Perot (FP) cavity resonant to FP cavity and LC electrical co-resonant. The measured thermally peak absorption frequency modulation range is 15.42−12.99 GHz, while the ultrathin thickness is only 0.071 of the central wavelength of this range. Moreover, the absorber can achieve high optical transparency from 380 to 6000 nm. Therefore, the proposed absorber has diverse applications in optics and modern intelligent platforms.

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Section: Introductionmentioning

confidence: 83%

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO₂ Film

Zhang,

Lu,

Tan

2023

ACS Appl. Nano Mater.

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“…To gain a deeper understanding of the physical mechanism of the proposed graphene metasurface, we use the equivalent circuit model (ECM) with lumped circuit elements to quantitatively analyze its reflection characteristics. , As shown in Figure , Z 0 , Z p , and Z s represent the free space wave impedance, the characteristic impedance of the graphene substrate, and the dielectric layer, respectively. R ito is the sheet resistance of the ITO film, and Z in is the equivalent input impedance of the entire device.…”

Section: Modeling and Simulationmentioning

confidence: 99%

Multifunctional Graphene Metasurface for Highly Flexible Control of Microwave Absorption

Wang,

Han,

Tao

et al. 2024

ACS Appl. Mater. Interfaces

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Reconfigurable multifunctional electromagnetic absorbers have shown broad application prospects in effectively dealing with a series of problems caused by complex electromagnetic environments due to their dynamic reflection wave control characteristics. In this work, we experimentally propose a multifunctional absorber based on a graphene metasurface. Its absorption mode can be flexibly switched among three modes of dual band, broadband, and single band. The reflection amplitude in each absorption mode can be controlled simultaneously. The measurement results of the prepared graphene metasurface indicate that the absorption modes and amplitudes can be dynamically controlled by changing two independent sets of bias voltages applied to the patterned graphene sandwich structures. The proposed graphene metasurface achieves peak absorption rates above 99.9% in both dual-band and single-band absorption modes. Specifically, in the broadband absorption mode, the bandwidth with an absorption rate greater than 90% reaches 17.8 GHz. In addition, it also integrates many advantages, such as optical transparency, polarization-insensitivity, stability of oblique incidence angles, and conformability to the application targets. Therefore, the proposed graphene metasurface is expected to be applied in platforms with optical windows that require resistance to electromagnetic interference and avoidance of electromagnetic radiation.

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“…[35][36][37] The connecting strips on the top and bottom sides of the graphene rectangular patch are modeled as resistors R ps and inductors L ps in parallel with the gap capacitance C p . [38][39] In the amplitude tuning layer, the equivalent resistance of graphene is represented by a variable resistance R s . [14] Other parts, PVC substrate and diaphragm paper, are respectively equivalent to the transmission line model with characteristic impedance Z pvc and Z paper .…”

Section: Model and Analysismentioning

confidence: 99%

“…Thus, the equivalent input impedance of the metasurface can be expressed as: (10) In this equation, 𝜖 eff = (𝜖 paper +𝜖 pvc )/2 is the relative effective permittivity, Z eff = Z 0 / √ 𝜀 eff is its equivalent impedance, the parameters W = P-D 1 , Z pdms = √ u 0 ∕𝜀 0 𝜀 pdms are the intrinsic impedances of the PDMS, and k eff = k 0 √ 𝜀 eff , and k pdms = k 0 √ 𝜀 pdms , respectively denote the propagation constants of the relative effective medium and PDMS. [38] The ITO patches and the patterns connected to them are essentially capacitive and their dimensions are not small compared with the cell cycle. Thus, the inductances L p and L i can be ignored.…”

Section: Model and Analysismentioning

confidence: 99%

Graphene‐Based Flexible Optically Transparent Dual‐Tunable Metasurface

Yang,

Xu,

Zhu

et al. 2024

Adv Materials Technologies

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Dynamically tunable flexible metasurfaces with optical transparency are essentially useful in stealth, electromagnetic sensing, and camouflage while keeping continuous optical observation and communication. In this paper, a dual‐tunable graphene‐based metasurface is designed based on patterned graphene sandwich structures, showing independent dynamic control of reflection amplitude and resonance frequency, excellent optical transparency, and outstanding flexibility. Both the simulated and measured results demonstrate that the transition from dual band absorption at 12 and 24.8 GHz to broad band absorption from 10 to 25.7 GHz, and the absorption amplitude can be tuned between −5 and −15 dB on average in each case dynamically and independently by applying bias voltage to graphene layers. Lastly, the distributions of the induced electric field and surface currents, as well as an equivalent circuit model, are provided to illustrate the tunable electromagnetic absorption mechanism. The designed metasurface has potential applications that are speculated in the fields of electromagnetic tune and electromagnetic stealth.

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Optically Transparent Frequency-Tunable Microwave Absorber Based on Patterned Graphene-ITO Structure

Cited by 19 publications

References 37 publications

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO₂ Film

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO₂ Film

Multifunctional Graphene Metasurface for Highly Flexible Control of Microwave Absorption

Graphene‐Based Flexible Optically Transparent Dual‐Tunable Metasurface

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Optically Transparent Frequency-Tunable Microwave Absorber Based on Patterned Graphene-ITO Structure

Cited by 19 publications

References 37 publications

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO2 Film

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO2 Film

Multifunctional Graphene Metasurface for Highly Flexible Control of Microwave Absorption

Graphene‐Based Flexible Optically Transparent Dual‐Tunable Metasurface

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Product

Resources

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Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO₂ Film

Visible–Infrared Transparent Ultra-Thin Frequency-Tunable Microwave Absorber Based on a Nanometer-Thick Patterned VO₂ Film