An Active Absorber Based on Nonvolatile Floating-Gate Graphene Structure

Peng, Xiliang; Hao, Ran; Chen, Wenchao; Chen, Hongsheng; Wang, Yin; Li, Er‐Ping

doi:10.1109/tnano.2016.2647283

Cited by 11 publications

(12 citation statements)

References 39 publications

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“…The graphene floating gate consists of the top five layers of the absorber, as shown in Figure 1 b. It works like this [ 41 ]: with forward bias voltage (the upper conductive layer takes the positive power supply, the lower conductive layer is connected with the negative), the electrons in the lower conductive layer can tunnel through the gate layer into the graphene composite layer to increase its carrier concentration. Conversely, when a reverse bias voltage is applied, the electrons in graphene can tunnel through the gate layer, leading to a decrease in its carrier concentration.…”

Section: Structure and Designmentioning

confidence: 99%

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A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate

et al. 2021

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Based on the graphene floating gate, a tunable terahertz metamaterial absorber is proposed. Compared with the traditional graphene–dielectric–metal absorber, our absorber has the property of being non-volatile and capacity for anti-interference. Using the finite element method, the paper investigates the absorption spectra, the electric field energy distribution, the tunability and the physical mechanism. In addition, we also analyse the influence of geometry, polarization and incident angles on the absorption. Simulation results show that the bandwidth of the absorption above 90% can reach up to 2.597 THz at the center frequency of 3.970 THz, and the maximum absorption can be tuned continuously from 14.405% to 99.864% by controlling the Fermi level from 0 eV to 0.8 eV. Meanwhile, the proposed absorber has the advantages of polarization insensitivity and a wide angle, and has potential applications in imaging, sensing and photoelectric detection.

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Section: Structure and Designmentioning

confidence: 99%

“…3D schematic (a) and side view of floating gate (b). The geometrical dimensions are P = 13 µm, L = 7.2 µm, h 1 = 0.2 µm, h 2 = 8.4 µm, h 3 = 0.2 µm, h 4 = 10 nm, h 5 = 1 nm, h 6 = 20 nm, h 7 = 0.2 µm.The values of h 4 and h 6 are derived from reference[41].…”

mentioning

confidence: 99%

A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate

et al. 2021

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“…In such a design, the graphene monolayer can capture the electrons tunneling from a positive external bias, but cannot release them after releasing the DC voltage because it is electrically isolated from the biasing electrodes. Hence, no extra power is required to maintain the graphene's conductivity at the desired value 43 . We realize the required amplitudes and phases of the transfer function (TF) associated with spatial and temporal operations by combining the surface impedance model of a graphene monolayer to a transmission line (TL) approach.…”

Section: Introductionmentioning

confidence: 99%

Switchable and Simultaneous Spatiotemporal Analog Computing

Momeni,

Rouhi,

Fleury

2021

Preprint

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Optical wave-based computing has enabled the realization of real-time information processing in both space and time domains. In the past few years, analog computing has experienced rapid development but mostly for a single function. Motivated by parallel space-time computing and miniaturization, we show that reconfigurable graphene-based metasurfaces offer a promising path towards spatiotemporal computing with integrated functionalities by properly engineering both spatial-and temporal-frequency responses. This paper employs tunable graphene-based metasurface to enable analog signal and image processing in both space and time by tuning the electrostatic bias. In the first part of the paper, we propose a switchable analog computing paradigm in which the proposed metasurface can switch among defined performances by selecting a proper external voltage for graphene monolayers. Spatial isotropic differentiation and edge detection in the spatial channel and first-order temporal differentiation and metasurface-based phaser with linear group-delay response in the temporal channel are demonstrated.In the second section of the paper, simultaneous and parallel spatiotemporal analog computing is demonstrated. The proposed metasurface processor has almost no static power consumption due to its floating-gate configuration. The spatial-and temporal-frequency transfer functions (TFs) are engineered by using a transmission line (TL) model, and the obtained results are validated with full-wave simulations.Our proposal will enable real-time parallel spatiotemporal analog signal and image processing.

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“…Retrieved μ and ε response of these materials introduce an effective medium, which is resonant at the working frequency due to material's internal inductance and capacitance. μ and ε of material generate pass bands or stop bands for EM waves to exhibit material's significance for multiple applications like wireless networks, radars, transmissions lines, magnetic resonance imaging (MRI), solar panels, and cellular communications 20‐31 …”

Section: Introductionmentioning

confidence: 99%

“…μ and ε of material generate pass bands or stop bands for EM waves to exhibit material's significance for multiple applications like wireless networks, radars, transmissions lines, magnetic resonance imaging (MRI), solar panels, and cellular communications. [20][21][22][23][24][25][26][27][28][29][30][31] Motivated by previous research, we propose polarization dependent negative permittivity controlled compact energy absorber with a thickness of 1.05 and 42 mm in diameter. The equivalent circuit model and synthesis of stop band creation of energy absorber are studied through absorber's 2 port transmission network.…”

Section: Introductionmentioning

confidence: 99%

Stop band blocking window modeling with energy absorber in 5G mid‐band cellular communications

Ali

Yan

Ahmed

et al. 2021

Int J RF Mic Comp-Aid Eng

Self Cite

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A polarization dependent negative permittivity controlled energy absorber is proposed. The preparatory study includes a unique design of 5G cell phone radiating patch antenna (RPA) centring at Sub‐6 Mid‐band frequency range from 3.3 to 3.8 GHz. The proposed configuration exhibits the energy absorptance efficiency of the absorber when attached with 5G cell phone RPA, where absorber will protect the human brain from exposure of radio frequency fields in mobile phone applications. In proposed setup, we vary the geometrical parameters as well as the electrical value of lumped inductor element of the energy absorber and obtained stop band blocking window with comparative study to restrict the specific absorption rate and power/energy flow radiating from RPA toward the simulated human's brain. Moreover, the absorber does not significantly creates mismatch losses, nor effects the voltage standing wave ratio of RPA and hence a promising application to avoid the health hazards as well as for the safety compliance of 5G technology.

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An Active Absorber Based on Nonvolatile Floating-Gate Graphene Structure

Cited by 11 publications

References 39 publications

A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate

A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate

Switchable and Simultaneous Spatiotemporal Analog Computing

Stop band blocking window modeling with energy absorber in 5G mid‐band cellular communications

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