Active plasmonic band-stop filters based on graphene metamaterial at THz wavelengths

Wei, Zhongchao; Li, Xianping; Yin, Jianjun; Huang, Rong; Liu, Yuebo; Wang, Wei; Liu, Hongzhan; Meng, Hongyun; Liang, Renrong

doi:10.1364/oe.24.014344

Cited by 69 publications

(32 citation statements)

References 31 publications

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“…where ω = 2π f is the angular frequency of THz radiation, τ is the relaxation time of charge carriers which can be approximately estimated (using Equation (13) after splittingσ(ω) into real and imaginary parts and their equalization through σ 0 ) as (15) with small dispersion (τ can vary in process of THz wave transmission, because the THz pulse duration is about 10 times higher than the relaxation time value),…”

Section: Thz Conductivity and Permittivitymentioning

confidence: 99%

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Optical and Galvanomagnetic Properties of Bi1-xSbx Thin Films in the Terahertz Frequency Range

et al. 2020

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We report results of galvanomagnetic and terahertz time-domain spectroscopy measurements on thin films of Bi 1−x Sb x on polyimide and mica substrates with various antimony concentrations (x from 0 to 15 %) and film thickness (70, 150 nm). The resistivity, Hall coefficient and magnetoresistivity of the films were measured experimentally in the magnetic field of 0.65 T at room temperature. Mobility and concentration of electrons and holes in the film plane were calculated using the transport coefficients. The terahertz time-domain spectroscopy is used to measure the complex conductivity and permittivity of Bi 1−x Sb x thin films on the dielectric substrates in the frequency range from 0.2 to 1 THz. The plasma frequency, relaxation time, DC conductivity and effective carrier mass were extracted from these data and evaluated as functions of the Sb concentration for different film thickness and substrate. We observed that the film magnetoresistivity decreases with increasing the Sb concentration and for most of the films the Hall coefficient is negative and depends on the external factors insignificantly. We show that the mobility of charge carriers weakly depends on Sb concentration, which confirms the assertion about the scattering of carriers on themselves and not on defects in the structure. It was revealed that film static and dynamic resistivity (conductivity) as well as dielectric permittivity depend on Sb content and the film thickness. The results may be used for development of various thermoelectric, electronic and optical devices, such as THz detectors or components which can control the properties of THz radiation.

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Section: Thz Conductivity and Permittivitymentioning

confidence: 99%

“…These dependencies are important for application in simulation of various thermoelectric, electronic and optical devices, such as detectors of THz radiation or components which can control the properties of radiation in the THz frequency range, i.e., filters, modulators, phase and polarization shifters, etc. [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Optical and Galvanomagnetic Properties of Bi1-xSbx Thin Films in the Terahertz Frequency Range

et al. 2020

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“…Recently a far-infrared wavelength region (3-100 µm, according to classification of the International Commission on Illumination) has been extensively studied. Appropriate devices can be applied in such fields as biomedical and chemical sensing, photo-thermal transformations, photodetection, optical modulation and switching, multispectral imaging and colour printing [1,2]. Plasmonic effects play a major role in high-speed data transmission and nanoelectronic technologies aimed at confining, storing, guiding and enhancing locally electromagnetic waves in the far-infrared region [3].…”

Section: Introductionmentioning

confidence: 99%

“…For example, the active band-stop filter presented in Ref. [2] can achieve a tuned dual-band filtering response from 11.8 to 13.4 µm or from 16.6 to 18.5 µm. Nonetheless, the tuning range mentioned above is still too narrow and does not cover a desirable wide range of far-infrared frequencies.…”

Section: Introductionmentioning

confidence: 99%

Wide-range tunable subwavelength band-stop filter for the far-infrared wavelengths based on single-layer graphene sheet

Abbas¹,

Khaleel²

2019

Ukr. J. Phys. Opt.

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A subwavelength metamaterial consisting of array of aluminium conductors is proposed and numerically analyzed using a finite-element method. This material is suggested for a tunable active band-stop filter working in the farinfrared region. A cell of our metamaterial-based structure is composed of a rhombic-shaped aluminium conductor, a rubidium-bromide dielectric, and a graphene sheet deposited on the dielectric in order to achieve tunability. A strong confinement of electromagnetic energy absorbed in the dielectric results in a highly efficient absorption. The suggested structure with the graphene sheet exposed to air can act as a highly sensitive refractive-index sensor (the sensitivity 6.8 μm/RIU). Due to a small size of our structure, it reveals perfect absorption at the far-infrared wavelengths and wide-range absorption tuning (from 23.6 to 38.1 µm). The metamaterials with the above structure can result in perfect absorbers for biomedical sensing.

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“…Bandstop filter is commonly used to selectively eliminate undesired information and suppress interfering signals. So far, many tunable bandstop filters based on metamaterials1720212223, such as mechanically tunable bandstop filters17202122, dynamic modulator based on microfluidic metasurface23, and active plasmonic bandstop filters resulting from varying of the chemical potential of graphene1530, have been proposed.…”

mentioning

confidence: 99%

Tunable reflecting terahertz filter based on chirped metamaterial structure

Yang

Gong

Sun

et al. 2016

Sci Rep

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Tunable reflecting terahertz bandstop filter based on chirped metamaterial structure is demonstrated by numerical simulation. In the metamaterial, the metal bars are concatenated to silicon bars with different lengths. By varying the conductivity of the silicon bars, the reflectivity, central frequency and bandwidth of the metamaterial could be tuned. Light illumination could be introduced to change the conductivity of the silicon bars. Numerical simulations also show that the chirped metamaterial structure is insensitive to the incident angle and polarization-dependent. The proposed chirped metamaterial structure can be operated as a tunable bandstop filter whose modulation depth, bandwidth, shape factor and center frequency can be controlled by light pumping.

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Active plasmonic band-stop filters based on graphene metamaterial at THz wavelengths

Cited by 69 publications

References 31 publications

Optical and Galvanomagnetic Properties of Bi1-xSbx Thin Films in the Terahertz Frequency Range

Optical and Galvanomagnetic Properties of Bi1-xSbx Thin Films in the Terahertz Frequency Range

Wide-range tunable subwavelength band-stop filter for the far-infrared wavelengths based on single-layer graphene sheet

Tunable reflecting terahertz filter based on chirped metamaterial structure

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