Tunable localized surface plasmon graphene metasurface for multiband superabsorption and terahertz sensing

Islam, Md. Saiful; Sultana, Jakeya; Biabanifard, Mohammad; Vafapour, Zohreh; Nine, J.; Dinovitser, Alex; Cordeiro, Cristiano M. B.; Ng, Brian W.-H.; Abbott, Derek

doi:10.1016/j.carbon.2019.11.026

Cited by 265 publications

(101 citation statements)

References 57 publications

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“…In this article, a temperature of T = 300 K (room temperature) and τ = 0.5 ps are assumed. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Here in this work, a modified circuit model approach is used to describe layers exploiting developed circuit representation in Reference 26. According to References 26-30, periodic arrays of Nano-disks can be modeled via passive circuit elements while physical features and technology dependents parameters are embedded in-circuit elements.…”

Section: Proposed Configurationmentioning

confidence: 99%

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Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme

Aghaee

Orouji

2020

Int J Numerical Modelling

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Utilizing a double bias scheme for graphene patterns as a single layer, a THz meta-surface structure is proposed. The structure includes two dual bias layers and a graphene continuous sheet on top. So five possible biases are available which lead to a highly tunable absorption response. All consisting parts are modeled via passive circuit elements to obtain whole device input impedance. Then impedance matching theory is used to investigate potential frequencies for perfect absorption. Also, ample simulations are performed to show the validity and accuracy of theoretical descriptions. According to the simulation results in the conventional finite element method as a reference approach is in acceptable agreement with the developed circuit model approach. The proposed structure shows nearly perfect absorption in 5, 6, 7, and 8 THz with absorption rate over 90%. Such a tunable reaction is in incredible requests in optical systems and has various applications in structuring sensors, modulators, and photonic functions.

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Section: Proposed Configurationmentioning

confidence: 99%

“…Finally, a continuous graphene sheet is placed on top of the whole device to enhance total absorption. Compared to conventional designs in References 1‐12, two first layers benefit from an extra bias, which leads to more degree of freedom to adjust input impedance using external control parameters (gate biasing).…”

Section: Proposed Configurationmentioning

confidence: 99%

Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme

Aghaee

Orouji

2020

Int J Numerical Modelling

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“…Graphene is a 2D-one-layer material consists of the honeycomb structure of atoms, which can be used to optimize and develop the function of devices because of its unusual electrical characteristics. Graphene, as an advanced electromagnetic material, can be used in electromagnetic devices to enhance and develop their functionality [7].…”

Section: Introductionmentioning

confidence: 99%

“…There are two methods to increase the frequency response bandwidth of polarization converter devices, using geometrical structures with multiple resonances [5][6][7] or using multiple layer structures [8].…”

Section: Introductionmentioning

confidence: 99%

Tunable Terahertz Polarization Converter Based on Graphene Metasurfaces

Bakhtiari

Oraizi

2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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In this paper, a broadband tunable polarization converter based on Graphene Metasurfaces is proposed. This polarization converter works in the Terahertz frequency region, using the advantage of Graphene characteristics. It has a tunable polarization conversion ratio. Designed Graphene-shaped periodic structure on top of the substrate is utilized to convert the incident wave polarization to the desired target in a flexible operational band in the terahertz frequencies. The polarization conversion ratio is more than 0.9 in a wide range of frequencies in the Terahertz band from 5.43 to 7.66 THz (the fractional bandwidth is 34%). The proposed polarization converter is insensitive to the angle of the incident wave up to 40°. Using Graphene provides a tunable frequency response without changing the geometry of the designed structure.

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“…For another example, a pyramid-shaped structure can increase the number of reflections and scatter in the structure by matching the impedance of free space, thus increasing the absorption efficiency [16].Since the concept of the perfect absorber was introduced in 2008, the research on superstructure electromagnetic material absorbers has shown exponential growth year by year [17][18][19][20]. From the initial microwave frequency band to terahertz [20,21], infrared [22,23], and visible frequency band [24][25][26][27], a large number of studies have been conducted, and absorption bandwidth also includes single-frequency absorption, dual-frequency absorption, multi-frequency absorption, and broadband absorption [28][29][30][31][32][33]. Compared with the traditional absorption materials, the advantage of the superstructure material absorber lies in the structure size, arrangement, and different materials selected to form the dual-frequency, multi-frequency, or dual-band absorber [34][35][36].…”

mentioning

confidence: 99%

A Perfect Absorber Based on Similar Fabry-Perot Four-Band in the Visible Range

Zhang

Tang

et al. 2020

Nanomaterials

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A simple metamaterial absorber is proposed to achieve near-perfect absorption in visible and near-infrared wavelengths. The absorber is composed of metal-dielectric-metal (MIM) three-layer structure. The materials of these three-layer structures are Au, SiO 2 , and Au. The top metal structure of the absorber is composed of hollow three-dimensional metal rings regularly arranged periodically. The results show that the high absorption efficiency at a specific wavelength is mainly due to the resonance of the Fabry-Perot effect (FP) in the intermediate layer of the dielectric medium, resulting in the resonance light being trapped in the middle layer, thus improving the absorption efficiency. The almost perfect multiband absorption, which is independent of polarization angle and insensitivity of incident angle, lends the absorber great application prospects for filtering and optoelectronics.Nanomaterials 2020, 10, 488 2 of 10 to their absorption band, absorption capacity, absorption principle, and absorption spectrum [8][9][10][11][12][13][14]. For example, the Salisbury screen is mainly used in the military to reduce the reflection of radar detectors by canceling the interference of reflected microwaves by the reflection layer [15]. The same principle can be used in optical frequencies to design an anti-reflective film on a camera lens or glass. For another example, a pyramid-shaped structure can increase the number of reflections and scatter in the structure by matching the impedance of free space, thus increasing the absorption efficiency [16].Since the concept of the perfect absorber was introduced in 2008, the research on superstructure electromagnetic material absorbers has shown exponential growth year by year [17][18][19][20]. From the initial microwave frequency band to terahertz [20,21], infrared [22,23], and visible frequency band [24][25][26][27], a large number of studies have been conducted, and absorption bandwidth also includes single-frequency absorption, dual-frequency absorption, multi-frequency absorption, and broadband absorption [28][29][30][31][32][33]. Compared with the traditional absorption materials, the advantage of the superstructure material absorber lies in the structure size, arrangement, and different materials selected to form the dual-frequency, multi-frequency, or dual-band absorber [34][35][36]. The structure size is small and the processing method is simple, which is conducive to the integration in the period surface [37][38][39]. The structure or quantity can be flexibly adjusted to achieve different absorption purposes. Due to the variety of absorbers, the absorbers have a different applicable wavelengths, bandwidths, structure characteristics, adjustable abilities, and absorption principles. In this paper, a multi-band metamaterial absorber in the visible light range is designed from the perspective of the absorption frequency band. By changing the structure size of the absorber and the metal structure on the surface, the absorber can achieve a broader tolerance range for polar...

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Tunable localized surface plasmon graphene metasurface for multiband superabsorption and terahertz sensing

Cited by 265 publications

References 57 publications

Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme

Highly tunable multi‐band THz absorber with circuit model representation using multi‐bias scheme

Tunable Terahertz Polarization Converter Based on Graphene Metasurfaces

A Perfect Absorber Based on Similar Fabry-Perot Four-Band in the Visible Range

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