Dual-band tunable perfect metamaterial absorber in the THz range

Yao, Gang; Ling, Furi; Yue, Jin; Luo, Chunya; Ji, Jie; Yao, Jianquan

doi:10.1364/oe.24.001518

Cited by 339 publications

(167 citation statements)

References 32 publications

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“…As shown in Fig. 3(a), it is obvious that the electric field at frequency f m1 is mainly concentrated on both sides of the square ring, indicating the existence of an electric dipole resonance on the square ring, as reported by Yao et al [27] . Additionally, the y componenta of the magnetic field at frequency f m1 are mainly focused on the middle of STO layer, which means that there exists a magnetic dipole resonance [28] , as shown in Fig.…”

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confidence: 66%

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Design of a concise and dual-band tunable metamaterial absorber

Luo

Yao

et al. 2016

中国光学快报

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We theoretically present a concise and tunable dual-band metamaterial absorber composed of a typical metaldielectric-metal structure in the terahertz regime. The dual-band absorption originates from two different resonance modes induced in one square ring, which is different from the common dual-band absorber composed of a super unit with several different-sized structures. The proposed absorber can realize dynamic tunability through changing the permittivity of the dielectric layer by applying different temperatures. Other good performances, such as a wide incident angle and polarization insensitivity, are also available for the proposed absorber. Such a metamaterial absorber is a promising candidate for terahertz imaging and detection.

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supporting

confidence: 66%

“…3(c). The resonant phenomenon at low frequency f m1 is the fundamental electromagnetic dipole resonance that appeared in some literature [15,21,[27][28][29] . As for the frequency f m2 , it can be seen from Figs.…”

mentioning

confidence: 99%

Design of a concise and dual-band tunable metamaterial absorber

Luo

Yao

et al. 2016

中国光学快报

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“…So far, based on this mechanism, metamaterial near-unity absorbers with electrical resonators including metallic disks14, strips1516, crosses10, and L-shaped structures17 have been designed and investigated comprehensively. By combining multiple resonators with different sizes together to form a super unit cell, the multi-channel or broadband perfect absorbers have also been achieved18192021. In addition, the method of the stack multilayer of resonators with different geometric parameters separated by dielectric layers has been used to realize the multi-channel or broadband absorption peaks2223.…”

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confidence: 99%

Tunable graphene-based mid-infrared plasmonic wide-angle narrowband perfect absorber

Wang

Zhai

2016

Sci Rep

101

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In this paper, the periodic double-layer graphene ribbon arrays placed near a metallic ground plate coated by a dielectric layer are proposed and analyzed by the coupled-mode theory (CMT) to predict the perfect absorption response in the mid-infrared region. Numerical simulations of the finite-difference time-domain (FDTD) method confirm this effect and give the underlying physical origin. The anti-symmetric dipole-dipole coupling mode is supported by the double-layer graphene ribbons and acts as the electrical resonance to suppress the reflection, because of the impedance matching. The transmission from this system is restricted by the ultra-thick metallic ground plate. All incident electromagnetic energy is efficiently confined in the interlayer between graphene ribbons and the metallic plate, and the dramatic narrowband perfect absorption peak with the FWHM (full width at half maximums) of 300 nm hence is achieved. The spectral position of the absorption peak can be dynamically tuned by a small change in the chemical potential of graphene, in addition to varying geometrical parameters of the absorber. Meanwhile, this device exhibits good absorption stability over a wide angle range of incidence around ± 60° at least. Such absorber will benefit the fabrication of mid-infrared nano-photonic devices for optical filtering and storage.

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“…Recently, a progress toward the improvement of tune method has been made by changing the material properties. Graphene [13][14][15][16][17] and strontium titanate 18,19 have been proposed for tunable metamaterials. Nevertheless, the fabrication of these kinds of devices is still a big challenge at current state-of-the-art.…”

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confidence: 99%

Electrically tunable terahertz dual-band metamaterial absorber based on a liquid crystal

Yin

Xia

et al. 2018

RSC Adv.

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In this paper, a liquid crystal (LC) based tunable metamaterial absorber with dual-band absorption is presented. The proposed absorber is analysed both numerically and experimentally. The analysis shows that the two absorption peaks, originating from the new resonant structure, are experimentally detected at 269.8 GHz and 301.4 GHz when no bias voltage is applied to the LC layer. In order to understand the absorption mechanisms, simulation results for the surface current and power loss distributions are presented. Since liquid crystals are used as the dielectric layer to realize the electrically tunable absorber, a frequency tunability of 2.45% and 3.65% for the two absorption peaks is experimentally demonstrated by changing the bias voltage of the LC layer from 0 V to 12 V. Furthermore, the absorber is polarization independent and a high absorption for a wide range of oblique incidence is achieved. The designed absorber provides a way forward for the realization of tunable metamaterial devices that can be applied in multi-band detection and imaging.

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Dual-band tunable perfect metamaterial absorber in the THz range

Cited by 339 publications

References 32 publications

Design of a concise and dual-band tunable metamaterial absorber

Design of a concise and dual-band tunable metamaterial absorber

Tunable graphene-based mid-infrared plasmonic wide-angle narrowband perfect absorber

Electrically tunable terahertz dual-band metamaterial absorber based on a liquid crystal

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