Gate-Tunable mid-Infrared Plasmonic Planar Band-Stop Filters Based on a Monolayer Graphene

Li, Hong-Ju; Wang, Lingling; Sun, Bin; Huang, Zhenhua; Zhai, Xiang

doi:10.1007/s11468-015-0028-x

Cited by 24 publications

(4 citation statements)

References 38 publications

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“…In our simulations, the ultra-narrow graphene ribbon with a width of 10 nm [27,[43][44][45][46][47] supports SPPs in the mid-infrared region. The surface conductivity (σ g ) of graphene is supported by Kubo's formula [48]…”

Section: Geometry Modeling and Methods Of Analysismentioning

confidence: 66%

Tunable graphene-based mid-infrared band-pass planar filter and its application

et al. 2018

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We have designed and proposed the edge modes supported by graphene ribbons and the planar band-pass filter consisting of graphene ribbons coupled to a graphene ring resonator by using the finite-difference time-domain numerical method. Simulation results show that the edge modes improve the electromagnetic coupling between devices. This structure works as a novel, tunable mid-infrared band-pass filter. Our studies will benefit the fabrication of planar, ultra-compact nano-scale devices in the mid-infrared region. A power splitter consisting of two output ribbons that is useful in photonic integrated devices and circuits is also designed and simulated. These devices are useful for designing ultra-compact planar devices in photonic integrated circuits.

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Section: Geometry Modeling and Methods Of Analysismentioning

confidence: 66%

Tunable graphene-based mid-infrared band-pass planar filter and its application

et al. 2018

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“…Here, to simplify the theoretical model, the terahertz wave propagation and coupling losses are not considered. For the harmonic time dependence of e −jωt , the temporal normalised mode amplitudes a i of the ith cavity (i = 1, 2, 3, 4) can be described as [26,27] da…”

Section: Theory Analysismentioning

confidence: 99%

“…Here, to simplify the theoretical model, the terahertz wave propagation and coupling losses are not considered. For the harmonic time dependence of e −j ωt , the temporal normalised mode amplitudes a i of the i th cavity ( i = 1, 2, 3, 4) can be described as [26, 27]

\frac{normald a_{i}}{normald t} = (- j ω_{i} - κ_{o, i} - κ_{e, i}) a_{i} + {normale}^{j θ_{i}} \sqrt{κ_{e, i}} S_{+, in}^{(i)} + {normale}^{j θ_{i}} \sqrt{κ_{e, i}} S_{-, in}^{(i)}

where ω i represents the resonance frequency of the i th cavity, κ o , i is the decay rate of the field due to internal loss in the i th cavity, and κ e,i is the decay rate due to the energy escape into the waveguide, θ i is the phase of coupling coefficient. The decay rates satisfy the relationships κ o , i = ω i /(2 Q o , i ), κ e,i = ω i /(2 Q e,i ), Q o , i and Q e,i stand for the intrinsic and coupling quality factors of the i th cavity, respectively.…”

Section: Theory Analysismentioning

confidence: 99%

Terahertz band‐stop filter based on graphene cavity

Ze-jiang

2018

Micro & Nano Letters

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In order to obtain ultra-compact and ultra-narrow bandstop performances, the work presents a terahertz filter based on graphene cavities, which consists of four graphene cavities and a graphene waveguide on SiO 2 /Si substrate. To demonstrate the feasibility of the approach, numerical simulation performed with the aid of the finite-element method is used to evaluate the terahertz performance of the proposed device. The structure rejects the signals at the frequencies from 5.9978 to 6.002 THz with >20 dB suppression. The high-Q band-rejection terahertz wave filter with four graphene cavities provides of 1500. The dimensions of the presented terahertz wave band-stop filter are of 22.5 μm × 18.0 μm. The high-performance, compact-size, and low-cost filter is designed for reducing the interference in future terahertz systems.

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“…For example, tunable plasmonic devices using graphene insulator stacks in the near-infrared band were experimentally demonstrated [10]. A monolayer graphene structure with tunable gates in the mid-infrared range was proposed to support the fabrication of planar nano-integrated plasmonic circuits [11]. Simulations were performed to achieve perfect plasmonic absorption in the far-infrared band using a metal-graphene-insulator-metal structure [12].…”

Section: Introductionmentioning

confidence: 99%

Plasmonic Characteristics of the Graphene-Photonic Crystal Composite Structure in the IR Regime

et al. 2022

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In this work a graphene-photonic crystal composite structure is proposed, in which graphene nanoribbons are placed on top of a photonic crystal that is composed of two alternating dielectric materials. The optical properties of the composite structure are investigated in the infrared regime, by varying the Fermi energy, the layer number of the graphene, as well as the polarization angle of the incident light. Plasmonic resonance effects are revealed and the resonance wavelength, the peak width, and the peak intensity are determined. Quantitatively, the polarization-angle dependent peak intensity is well fitted to a trigonometric function. It is demonstrated that the resonance peak is quite sensitive to the dielectric material that is adjacent to the graphene. It is also shown that the structure has a high sensitivity of 7660 nm/RIU to the refractive index of the surrounding environment, with a figure of merit of 6.38. Based on the results, the graphene-photonic crystal composite structure proposed in this work may have potential applications in designing of plasmonic devices, such as ones that can be used to detect subtle variations in the refractive index of surrounding environments.

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Gate-Tunable mid-Infrared Plasmonic Planar Band-Stop Filters Based on a Monolayer Graphene

Cited by 24 publications

References 38 publications

Tunable graphene-based mid-infrared band-pass planar filter and its application

Tunable graphene-based mid-infrared band-pass planar filter and its application

Terahertz band‐stop filter based on graphene cavity

Plasmonic Characteristics of the Graphene-Photonic Crystal Composite Structure in the IR Regime

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