Investigating flexible band-stop metamaterial filter over THz

Yang, Yuhua; Xu, Yongqing; Zhang, Binzhen; Duan, Junping; Li, Yan; Xu, Hongcheng; Liu, Yunpeng; Shi, Yanan

doi:10.1016/j.optcom.2019.01.023

Cited by 22 publications

(5 citation statements)

References 31 publications

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“…Metamaterials (MMs) are the artificially engineered mediums, wherein periodically repeated subwavelength-sized metallic or dielectric unit cells are arranged to exhibit unique and exotic electromagnetic (EM) properties [1]- [4]. These find potentials in optical imaging [5], cloaking mediums [6], antennas [7], holography [8], ultra-sensitive sensors [9]- [12], filters [13], [14], perfect absorbers [15]- [18], etc. [19]- [21].…”

Section: Introductionmentioning

confidence: 99%

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Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

et al. 2021

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A specially designed metallic E-shaped fractal-based perfect metamaterial absorber (PMA) with fairly wideband absorptivity in the K-and Ka-bands of the microwave regime was investigated. The PMA top surface is comprised of square-shaped split-ring resonators (SRRs) surrounded with the stated fractal design. The absorptivity of PMA was analyzed in the range of 20−30 GHz for the normal and oblique incidence of waves. Both the transverse electric (TE) and transverse magnetic (TM) modes were taken up to observe the robustness of the proposed design. It was observed that the fractal resonators exhibit capacitive effect at low frequencies, whereas the SRRs manifest capacitive effect at higher frequencies. The simulation and measured results were found to be in fairly good agreement. It is expected that the proposed design of PMA would be useful for 5G communication applications.

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Section: Introductionmentioning

confidence: 99%

“…To date, several forms of PMAs have been reported for suitably operating in the microwave, terahertz, visible and ultraviolet regimes [13], [30]- [32]. The desired absorption band can be essentially achieved by tailoring/optimizing the geometric parameters of the constituent meta-atoms (or the unit cells).…”

Section: Introductionmentioning

confidence: 99%

Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

et al. 2021

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“…During the recent decades, the efficient tunability of the optical spectrum of meta-material absorbers have intensely attracted the attention of many researchers, since they play a key role in a wide range of applications including tunable optical filters [1][2][3], nano-sensors [4,5], photo-detectors [6][7][8],optical switches, and so on. This efficient tunability stems from the efficiently adjustable Electro-Magnetic (EM) field strengths associated with resonant excitation of plasmons inside the metallic nano-structures [9].…”

Section: Introductionmentioning

confidence: 99%

“…This is realizable through enhancement of the intensity of their electromagnetic plasmon fields at the desired wavelengths. Two typical methods have been proposed to improve the strength of these plasmon fields: 1) optimization of the structural parameters and materials [1][2][3][4][5][6][7][8][9], 2) assembly of the plasmonic nanoparticles in order to create strong coupling interactions between the plasmon fields of neighboring nanoparticles through hybridization [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

Mashkour

Koochaki

Ziabari

et al. 2021

Preprint

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In this paper a Metal-Insulator-Metal (MIM) plasmonic absorber consisting of asymmetric double bars with bent arms located on top of a silica layer coated on a metal film is proposed, and its resonant features are analyzed. The suggested structure supports both Fano and dipole perfect absorption resonances at the Near-Infrared Region (NIR). The asymmetry introduced into the structure can be induced by changing the bending angle or rotation angle of one of the antennas while the other one remains fixed. Simulation results demonstrate that by applying both asymmetry factors to the structure, one can have two individual Fano peaks at the same time. It is shown that the magnitude, central wavelength and line-width of the Fano peaks are adjustable by controlling the geometrical parameters of the structure. It is also indicated that, the quality factor (Q-factor) of the Fano resonance is inversely related to the degree of asymmetry introduced into the structure. According to the simulations, an ultra-narrow resonance peak with a bandwidth of 1.87 nm at the wavelength of 710 nm (corresponding to a Q-factor of 387) can be obtained by controlling the geometrical parameters. It is also discussed that, the absorptivity of Fano and the dipole peaks can be adjusted inversely, by manipulating the grapheme chemical potential. The ratio of the absorptivity to the chemical potential of graphene about-275 %/eV and 226 %/eV is calculated for the Fano peak and dipole peak, respectively. Accordingly, the presented structure is an adjustable NIR absorber with a fully tunable absorption spectrum which can be utilized in various applications from tunable reflectors and photo-detectors to ultra-narrowband and broadband optical modulators.

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“…Terahertz wave, which is between infrared and microwave, has been rapidly developed and widely applied in many fields including medicine, biosensor, wireless communication, security, etc . In recent years, many functional terahertz devices have been designed and developed, such as filters, polarization converters, absorbers, modulators, and switches …”

Section: Introductionmentioning

confidence: 99%

A photoexcited switchable tristate terahertz metamaterial absorber

Yuan

Yang

Tian

et al. 2019

Int J RF Microw Comput Aided Eng

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In this study, we propose a photoexcited tristate terahertz metamaterial absorber which can switch between single-/single-/dual-band absorption modes in terahertz regime. The unit cell of the absorber incorporates two kinds of photosensitive semiconductor materials filled the gaps between four asymmetric right-angle wires and a cross wire. By applying different wavelengths of pump light on the absorber, two kinds of semiconductor materials can be excited to realize single-/single-/dual-band switchable absorption characteristics. The distributions of electric fields and surface currents at absorption peak frequencies under three absorption states are demonstrated to elucidate the switchable mechanism of the proposed absorber. Moreover, the absorption performance of the proposed tristate absorber is discussed under different polarization and incidence angles. The proposed structure is expected to be applied in the terahertz devices such as tunable absorbers, modulators, filters, and switches.

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Investigating flexible band-stop metamaterial filter over THz

Cited by 22 publications

References 31 publications

Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

Wideband Microwave Absorber Comprising Metallic Split-Ring Resonators Surrounded With E-Shaped Fractal Metamaterial

Demonstration of Tunable Fano Resonances In A Meta-Material Absorber Composed of Asymmetric Double Bars With Bent Arms

A photoexcited switchable tristate terahertz metamaterial absorber

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