Ultrathin multi-band planar metamaterial absorber based on standing wave resonances

Peng, Xiaomin; Wang, Bing; Lai, Shumin; Zhang, Dao Hua; Teng, Jinghua

doi:10.1364/oe.20.027756

Cited by 133 publications

(73 citation statements)

References 21 publications

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“…Obviously, there are four distinct absorption bands with absorptivity above 80%, i.e., 6.5-10 GHz, 8-12 GHz, 11.8-18.2 GHz, and 12-18.5 GHz. These discrete absorption bands can be interpreted by the standing wave resonance mechanism [15]. The metal-dielectric-metal structure can be considered as a waveguide, in which the standing wave resonances are generated when the EM waves from adjacent gaps propagate oppositely in the spacer layer.…”

Section: Discussionmentioning

confidence: 99%

“…Compared to the traditional absorbers, such as quarter-wave antireflection coatings and surface relief structures that are limited by their large and bulk dimensions [8,9], metamaterial absorbers (MAs) have attracted considerable attention from microwave to optical frequency by virtue of the perfect absorption, thin thickness and flexible design [10][11][12][13]. MAs are typically made of a patterned metal film above a homogeneous metal film with a dielectrics spacer [14][15][16]. Broadening the absorption bandwidth of MAs is very important for most practical applications such as stealth technology and energy harvesting.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Broadband Absorption With Gradient Pyramidal Metamaterials

Liu¹,

Guo²,

Han³

2017

PIER C

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Abstract-We propose a novel absorber by integrating four different-sized pyramidal metamaterials into a unit cell, which leads to a super broadband absorption by properly selecting the geometrical parameters for each pyramid. It is found that in such a design strategy, the high-order modes may be excited and further enhanced by multi-layer overlapping between adjacent unit cells. The as-designed MA, which consists of 13 pairs of alternating metal-dielectric layers with a total thickness of 4.13 mm, shows an absorption of above 90% in the whole frequency range of 7-21.5 GHz. The full width at half maximum is 101.8%, and the ratio of operational bandwidth to thickness achieves 7. The proposed MA is 30% broader and 5.2% thinner than previously reported absorbers working in the same spectral region. Numerical result shows that the proposed absorber is independent of the polarization. The absorption decreases with fluctuations as the incident angle increases but remains quasi-constant up to relatively large angles. Such a design shows great promise for a broad range of applications at microwave frequencies, and the proposed scheme may be extended to the visible, infrared, terahertz spectral regions.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband Absorption With Gradient Pyramidal Metamaterials

Liu¹,

Guo²,

Han³

2017

PIER C

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“…These structured films are usually much thinner than their resonance wavelengths, 10 and the periodicity of the structures that comprise them is similarly sub-wavelength. Independence on polarization and incidence angle have been demonstrated [11][12][13][14][15] . *janardan..nath@knights.ucf.edu Structured thin-film absorbers typically comprise 3 layers, namely a top surface metal with sub-wavelength patterning, a dielectric spacer, and a metal ground plane on suitable substrate [3][4][5][6][7][8][9][10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 97%

Infra-red spectral microscopy of standing-wave resonances in single metal-dielectric-metal thin-film cavity

Nath

Panjwani

Khalilzadeh-Rezaie

et al. 2015

Metamaterials, Metadevices, and Metasystems 2015

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Resonantly absorbing thin films comprising periodically sub-wavelength structured metal surface, dielectric spacer, and metal ground plane are a topic of current interest with important applications. These structures are frequently described as "metamaterials", where effective permittivity and permeability with dispersion near electric and magnetic resonances allow impedance matching to free space for maximum absorption. In this paper, we compare synchrotron-based infrared spectral microscopy of a single isolated unit cell and a periodic array, and we show that the resonances have little to do with periodicity. Instead, the observed absorption spectra of usual periodically structured thin films are best described as due to standing-wave resonances within each independent unit cell, rather than as due to effective optical constants of a metamaterial. The effect of having arrays of unit cells is mainly to strengthen the absorption by increasing the fill factor, and such arrays need not be periodic. Initial work toward applying the subject absorbers to room-temperature bolometer arrays is presented.

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“…6 Metamaterial absorber (MMA) has attracted considerable attention since Landy proposed an ultra-thin perfect absorber composed of artificial sub-wavelength composites. 7 To date, a large number of efforts [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] have been made on MMAs to achieve multi-band absorption, broadband absorption, polarization-insensitive absorption and wide incident angle absorption, due to the important applications in the field of solar cells, 24 thermal emitters 25 and sensors. 26 In general, the traditional MMAs are constructed of a delicate periodic patterned metal layer for minimizing reflection by impedance matching and a background metal layer for blocking transmission, separated by a flat dielectric substrate for dissipating energy.…”

Section: Introductionmentioning

confidence: 99%

Low-frequency metamaterial absorber with small-size unit cell based on corrugated surface

et al. 2016

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In this paper, we report the design, analysis, and simulation of the low-frequency perfect metamaterial absorber (MMA) based on corrugated surface, which has very small unit-cell size. The proposed MMA consist of a regular square-array and a metallic background plane, separated by a corrugated surface with periodic square-pillar-array. Through the optimized design, the ratios between lattice constant and resonance wavelength for nearly-perfect and high absorption MMA are close to 1/15 and 1/21, respectively. To explain the absorption mechanism of suggested structures, the surface current and electromagnetic field distributions are given. Moreover, the absorption peaks remain high with large angles of incidence for both transverse electric and transverse magnetic polarizations, which provide more efficient absorptions for oblique incident electromagnetic wave.

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Ultrathin multi-band planar metamaterial absorber based on standing wave resonances

Cited by 133 publications

References 21 publications

Ultra-Broadband Absorption With Gradient Pyramidal Metamaterials

Ultra-Broadband Absorption With Gradient Pyramidal Metamaterials

Infra-red spectral microscopy of standing-wave resonances in single metal-dielectric-metal thin-film cavity

Low-frequency metamaterial absorber with small-size unit cell based on corrugated surface

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