A Tunable Ultra-Broadband Metamaterial Absorber with Multilayered Structure

Dao, Ri‐Na; Kong, Xin-Ru; Zhang, Haifeng; Tian, Xingliang

doi:10.1007/s11468-019-01013-9

Cited by 26 publications

(10 citation statements)

References 24 publications

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“…We can find in the absorber in 6.5-8.95 THz frequency range you have incredibly high broadband absorption, within the scope of the average absorption can reach more than 98.6%, and 99.9% in many places have high absorption. Compared with other people's work, the absorption bandwidth has been greatly improved, as shown in table 1 [44]- [48]. To this, we combine the absorber in figure 3 electric field, and current density distribution on the absorption mechanism of the absorber are studied.…”

Section: A Absorption Curve and Mechanism Of Infrastructurementioning

confidence: 99%

Study on Temperature Adjustable Terahertz Metamaterial Absorber Based on Vanadium Dioxide

et al. 2020

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In the study of modern optics, the work of terahertz metamaterial absorbers is mostly multi-band perfect absorbers and ultra-wideband perfect absorbers. In contrast, in practical applications, metamaterial absorbers with adjustable resonance frequency or amplitude play an essential role in many forms. Here, we firstly designed an ultra-wideband terahertz metamaterial perfect absorber, achieving over 99% perfect absorption in the 6.6-8.9 THz range. Secondly, based on the absorber, phase change material VO 2 was added to improve the structure, and three tunable terahertz metamaterial absorbers based on VO 2 were designed, respectively realizing broadband movement and conversion between broadband and multiband. Also, the terahertz absorber with dynamic tuning characteristics can flexibly control the absorption performance, providing an excellent platform for the realization of terahertz filtering, modulation, and so on.INDEX TERMS Broadband, multiband, active tuned, vanadium dioxiderption, high quality factor.

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Section: A Absorption Curve and Mechanism Of Infrastructurementioning

confidence: 99%

Study on Temperature Adjustable Terahertz Metamaterial Absorber Based on Vanadium Dioxide

et al. 2020

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“…By tailoring the geometrical dimensions, metamaterials can be designed to span broad operating wavelengths, including visible [ 31 , 32 , 33 ], IR [ 34 , 35 , 36 , 37 , 38 , 39 ], terahertz [ 40 , 41 , 42 , 43 , 44 ], and microwave light [ 45 , 46 ]. To provide metamaterials with more flexibility, there are many techniques proposed for tuning mechanisms using MEMS technology [ 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 ]: liquid crystal [ 55 ], photo-excited [ 56 ], phase-change materials [ 57 , 58 ], thermal annealing [ 59 ], and so on. One important tuning method for metamaterial emitters is the integration of microheaters and metamaterials owing to their high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Tunable Infrared Metamaterial Emitter for Gas Sensing Application

Lin

2020

Nanomaterials

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We present an on-chip tunable infrared (IR) metamaterial emitter for gas sensing applications. The proposed emitter exhibits high electrical-thermal-optical efficiency, which can be realized by the integration of microelectromechanical system (MEMS) microheaters and IR metamaterials. According to the blackbody radiation law, high-efficiency IR radiation can be generated by driving a Direct Current (DC) bias voltage on a microheater. The MEMS microheater has a Peano-shaped microstructure, which exhibits great heating uniformity and high energy conversion efficiency. The implantation of a top metamaterial layer can narrow the bandwidth of the radiation spectrum from the microheater to perform wavelength-selective and narrow-band IR emission. A linear relationship between emission wavelengths and deformation ratios provides an effective approach to meet the requirement at different IR wavelengths by tailoring the suitable metamaterial pattern. The maximum radiated power of the proposed IR emitter is 85.0 µW. Furthermore, a tunable emission is achieved at a wavelength around 2.44 µm with a full-width at half-maximum of 0.38 µm, which is suitable for high-sensitivity gas sensing applications. This work provides a strategy for electro-thermal-optical devices to be used as sensors, emitters, and switches in the IR wavelength range.

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“…Nowadays, MMAs have possessed the advantages of being multi-band, ultrathin, and with strong attenuation [12][13][14]. Among these, ultra-broadband absorption is directly related to the performance as well as the application prospect of a proposed MMA, which has led many researchers to present several strategies [15][16][17] to overcome the drawback of a narrow resonance absorbing bandwidth. In addition, it is crucial to consider insensitivity or stability when designing MMAs, and many improvement works have been demonstrated, including polarization insensitivity, wide-angle incidence insensitivity, and stretch insensitivity [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A thermal-insensitive ultra-broadband metamaterial absorber

Bai

Zhong

Shen

et al. 2020

J. Phys. D: Appl. Phys.

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In this paper, a thermal-insensitive ultra-broadband metamaterial absorber (MMA) based on indium tin oxide (ITO) patterns and the SiO2 dielectric substrate is proposed to demonstrate high-temperature stability and excellent absorbability. The surface patterns consist of two different sizes of rectangular split-ring resonators with two gaps in each split-ring. Results from simulation indicate that at the initial temperature of 300 K, the relative absorption bandwidth reaches 83.35%, and the spectrum with absorptivity higher than 90% ranges from 8.00 GHz to 19.43 GHz. Moreover, in the temperature range of 300–700 K, the effective bands remain steady and cover more than 95% of the initial band. The simulation results also verify that the performance of MMA remains stable when exposed to high-intensity incident and high temperature of 500 K. The analysis of the surface current, electromagnetic (EM) field, power-loss density, equivalent circuit, and constitutive EM parameters reveals the mechanisms of thermal-insensitive ultra-broadband. This study expands potential applications of MMAs in conditions with thermal-stable demands.

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A Tunable Ultra-Broadband Metamaterial Absorber with Multilayered Structure

Cited by 26 publications

References 24 publications

Study on Temperature Adjustable Terahertz Metamaterial Absorber Based on Vanadium Dioxide

Study on Temperature Adjustable Terahertz Metamaterial Absorber Based on Vanadium Dioxide

Tunable Infrared Metamaterial Emitter for Gas Sensing Application

A thermal-insensitive ultra-broadband metamaterial absorber

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