Ultrathin and Optically Transparent Microwave Absorber Based on Flexible Silver Nanowire Film

The design of an optically transparent and flexible metamaterial absorber was presented and fabricated. For this purpose, we use two different patterned silver nanowire films separated by the space layer, forming a transparent sandwiched structure with an ultrathin thickness. By analyzing the equivalent circuit model and distribution of electric field and current, the absorption physical mechanism has been theoretically investigated. The results show that the structure can achieve above 0.8 absorptions from 6 GHz to 18 GHz, and at the same time, this absorber also can obtain wide-angle property. The optical transmittance of the fabricated absorber exceeds 82% in the visible band. The results demonstrate that transparency and flexibility are the additional benefits that make the proposed absorber suitable for various potential applications.

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An ultra-wideband and wide-angle optically transparent flexible microwave metamaterial absorber

Journal of Physics D Applied Physics ◽

10.1088/1361-6463/abf70b ◽

2021 ◽

Vol 54 (27) ◽

pp. 275101

Author(s):

Yufan Zhao ◽

Shuying Li ◽

Yuying Jiang ◽

Changqing Gu ◽

Liangliang Liu ◽

...

Keyword(s):

Metamaterial Absorber ◽

Ultra Wideband ◽

Wide Angle ◽

Optically Transparent

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Investigation of a broadband and polarization-insensitive optical absorber based on closed-ring resonator

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863516500326 ◽

2016 ◽

Vol 25 (03) ◽

pp. 1650032 ◽

Cited By ~ 8

Author(s):

Dan Hu ◽

Hong-Yan Wang ◽

Qiao-Fen Zhu ◽

Xi-Wei Zhang ◽

Zhen-Jie Tang

Keyword(s):

Ring Resonator ◽

Metamaterial Absorber ◽

Broadband Absorption ◽

Solar Energy Harvesting ◽

Closed Ring ◽

Visible Wavelength Range ◽

Potential Applications ◽

Polarization Insensitive ◽

Sandwiched Structure ◽

Compact Design

A broadband and polarization-insensitive optical metamaterial absorber (MA) based on the refractory metal chromium (Cr) closed-ring resonator is theoretically investigated. The semiconducting silicon dioxide (SiO[Formula: see text] thin film is introduced as the space layer in this sandwiched structure. Utilizing the symmetrical geometry of the proposed MA structure, polarization insensitivity of the broadband absorption is gained. The simulation results show that the absorber with Cr closed-ring array obtains an average absorption of 99.25% from 400[Formula: see text]nm to 900[Formula: see text]nm, covering the total visible wavelength range. This compact design may have potential applications in solar energy harvesting, thermal imaging, and emissivity control.

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Ultrathin polarization-insensitive tri-band THz perfect metamaterial absorber

EPJ Applied Metamaterials ◽

10.1051/epjam/2020003 ◽

2020 ◽

Vol 7 ◽

pp. 2

Author(s):

Zhaomei Liu ◽

Xingxing Han ◽

Aixia Wang

Keyword(s):

Cell Structure ◽

Metamaterial Absorber ◽

Q Factor ◽

Simulated Spectrum ◽

Thz Imaging ◽

Potential Applications ◽

Polarization Insensitive ◽

Perfect Metamaterial Absorber ◽

Sandwiched Structure ◽

Patch Resonators

In this paper, an ultrathin and polarization-insensitive THz perfect metamaterial absorber (PMA) was proposed using the traditional sandwiched structure with circular patch resonators on the top layer. The simulated spectrum shows that the proposed PMA has three distinctive absorption peaks at f1 = 0.8 THz, f2 = 2.28 THz and f3 = 3.62 THz, with absorbance of 96.7%, 97.9% and 99.8%, respectively. The electric field distributions of the PMA reveal that the absorption mainly originates from the standing wave resonances between the top and bottom layers. The proposed PMA is polarization insensitive due to its axisymmetric unit cell structure. By adjusting the structure parameters, the resonance frequency, intensity and Q-factor of absorption peak can be tuned effectively. Our design may find potential applications in THz imaging, sensing and signal detection.

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A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate

Micromachines ◽

10.3390/mi12030333 ◽

2021 ◽

Vol 12 (3) ◽

pp. 333

Author(s):

Jinjun Bai ◽

Wei Shen ◽

Jia Shi ◽

Wei Xu ◽

Shusheng Zhang ◽

...

Keyword(s):

Physical Mechanism ◽

Metamaterial Absorber ◽

Floating Gate ◽

Center Frequency ◽

Field Energy ◽

The Finite Element Method ◽

Photoelectric Detection ◽

Potential Applications ◽

Simulation Results ◽

Metal Absorber

Based on the graphene floating gate, a tunable terahertz metamaterial absorber is proposed. Compared with the traditional graphene–dielectric–metal absorber, our absorber has the property of being non-volatile and capacity for anti-interference. Using the finite element method, the paper investigates the absorption spectra, the electric field energy distribution, the tunability and the physical mechanism. In addition, we also analyse the influence of geometry, polarization and incident angles on the absorption. Simulation results show that the bandwidth of the absorption above 90% can reach up to 2.597 THz at the center frequency of 3.970 THz, and the maximum absorption can be tuned continuously from 14.405% to 99.864% by controlling the Fermi level from 0 eV to 0.8 eV. Meanwhile, the proposed absorber has the advantages of polarization insensitivity and a wide angle, and has potential applications in imaging, sensing and photoelectric detection.

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Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200145 ◽

2020 ◽

Vol 91 (3) ◽

pp. 30901

Author(s):

Yibo Tang ◽

Longhui He ◽

Jianming Xu ◽

Hailang He ◽

Yuhan Li ◽

...

Keyword(s):

Transverse Electric ◽

Surface Current ◽

Dielectric Substrate ◽

Transverse Magnetic ◽

Metamaterial Absorber ◽

Absorption Peak ◽

Dual Band ◽

Single Peak ◽

Wide Angle ◽

Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

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