A broadband polarization insensitive metamaterial absorber based on three-dimensional structure

Wang, Lingling; Liu, Shaobin; Zhang, Haifeng; Wen, Yongdiao; Bian, Borui; Kong, Xiangkun; Feng, Xue

doi:10.1109/piers.2017.8262188

Cited by 3 publications

(3 citation statements)

References 10 publications

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“…The optimized parameters of the unit cell are listed as follows: p = 3 μm, w = 0.25 μm, g = 0.05 μm, l 1 = 1.25 μm, l 2 = 2.35 μm, t 1 = t 2 = t 3 = 0.1 μm. Our results are obtained through a full wave EM simulation based on finite integration technique (FIT) and finite element method (FEM) owing to their accuracy in results and its suitability for the study of high frequency and three-dimensional EM structures 37 – 39 . In the x - and y - directions, the unit cell boundary conditions are utilized, and open space boundary conditions are applied in the z -direction.…”

Section: Structure and Simulationmentioning

confidence: 99%

Design of broadband graphene-metamaterial absorbers for permittivity sensing at mid-infrared regions

Huang

Xia

Xie

et al. 2018

Sci Rep

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In this paper, a tunable broadband metamaterial absorber (MA) based on graphene is investigated theoretically and numerically at mid-infrared regions. Compared with the previously reported multiband graphene-based MAs, a broad bandwidth of 11.7 THz with the absorption over 90% is obtained in the proposed MA, which is composed of a Jerusalem cross (JC) metal encrusting into the slot graphene layer in the top layer. The results show that the origin of broadband absorption is caused by coupling effect between metal and graphene, and this effect is explained by the two-mode waveguide coupling theory. The tunability of MA is achieved via changing the external gate voltage to modify the Fermi energy of graphene. Further results show that the proposed MA can be used as the permittivity sensor with a high absorption. This work indicates that the proposed MA has the potential applications with respect to sensors and infrared absorbers.

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Section: Structure and Simulationmentioning

confidence: 99%

Design of broadband graphene-metamaterial absorbers for permittivity sensing at mid-infrared regions

Huang

Xia

Xie

et al. 2018

Sci Rep

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“…One of the most efficient methods to acquire enhanced working bandwidth is to combine various resonant units, specifying different frequencies, inside a single unit in a multilayered fashion [60,61]. The occurrence of several phenomena between multiple layers of the structure gives rise to the absorption rate of the absorber.…”

Section: Issues Of Bandwidth and Thicknessmentioning

confidence: 99%

The quest for perfect electromagnetic absorber: a review

Tirkey

Gupta

2018

Int. J. Microw. Wireless Technol.

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This paper specifies a concise review of recent research and development in the context of electromagnetic absorbers. An attempt has been made to justify the need for economical and thin microwave absorbers for achieving good absorption characteristics over a wide range of frequencies within a specified band of electromagnetic spectrum. This paper mainly focuses on the challenges encountered while designing a perfect electromagnetic absorber which can absorb electromagnetic radiations of any polarization that may appear from any direction and may occur over a broader bandwidth. The absorbers which are competent enough to withstand all these challenges are capable to suppress the reflection and transmission of unknown electromagnetic radiations efficiently to the lowest possible level. Several prospects of nanotechnology in flexible absorber design are also described to enhance absorber characteristics. This paper also provides a futuristic glimpse on several applications of such absorbers for commercial and military purposes.

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“…2,3) Through many years of exploring, metamaterial absorbers have enabled spectrally selective absorption from microwaves to visible bands. [4][5][6][7][8][9][10] Among these, terahertz metamaterial absorbers are especially important because of the development of THz technology and the lack of natural materials that can effectively interact with a THz wave. 11) However, absorption bandwidths of most terahertz metamaterial absorbers are usually narrow because the resonance is utilized in the process of absorption.…”

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confidence: 99%

Structure-insensitive switchable terahertz broadband metamaterial absorbers

Liu

Zhang

et al. 2019

Appl. Phys. Express

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A nearly structural-insensitive switchable broadband terahertz metamaterial absorber is proposed, which consists of several gold rods and a vanadium dioxide (VO2) ground plane separated by a dielectric spacer. By controlling the temperature of VO2, state of the absorber can be switched from “on” to “off” in the frequency range of 1.116–1.564 THz. The physical mechanism of the absorber is given based on the wave-interference theory and field distributions. Interestingly, the proposed absorber shows a similar performance for random arrangements of a given number of rods on the top layer, which could greatly reduce the requirement of fabrication accuracy.

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A broadband polarization insensitive metamaterial absorber based on three-dimensional structure

Cited by 3 publications

References 10 publications

Design of broadband graphene-metamaterial absorbers for permittivity sensing at mid-infrared regions

Design of broadband graphene-metamaterial absorbers for permittivity sensing at mid-infrared regions

The quest for perfect electromagnetic absorber: a review

Structure-insensitive switchable terahertz broadband metamaterial absorbers

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