A tunable graphene-based refractive index sensor for THz bio-sensing applications

Alizadeh, Somayeh; Zareian‐Jahromi, Ehsan; Mashayekhi, Valiollah

doi:10.1007/s11082-021-03434-5

Cited by 12 publications

(2 citation statements)

References 38 publications

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“…21 In addition, the conductivity of graphene can be controlled by changing its Fermi energy level using chemical or electrical doping methods, which are utilized to realize the active metamaterial devices with ultrafast modulation speed. [22][23][24][25] Recently, a variety of graphene-based tunable metamaterials have been presented to achieve the analogue EIT. 6,[26][27][28][29][30] However, most of them were proposed to operate in the mid-infrared frequency regime, resulting in nanoscale graphene-based metamaterial structures which were unable to be easily adjusted in practice.…”

Section: Introductionmentioning

confidence: 99%

“…Graphene, a two‐dimensional material, has attracted enormous attention due to its excellent electrical and optical properties 21 . In addition, the conductivity of graphene can be controlled by changing its Fermi energy level using chemical or electrical doping methods, which are utilized to realize the active metamaterial devices with ultrafast modulation speed 22–25 . Recently, a variety of graphene‐based tunable metamaterials have been presented to achieve the analogue EIT 6,26–30 .…”

Section: Introductionmentioning

confidence: 99%

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Graphene‐based tunable terahertz electromagnetically induced transparency using metamaterial structure

Xia

Cai

et al. 2022

Micro & Optical Tech Letters

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A graphene‐based tunable electromagnetically induced transparency (EIT)‐like metamaterial structure operating at the terahertz regime is proposed and numerically analyzed. The unit cell of the metamaterial structure consists of a split‐ring resonator and twofolded‐line pair resonators, performing as the quasi‐dark mode and bright mode, respectively. When the incident waves vertically illuminate upon the metamaterial structure, a transmission peak can be observed. Moreover, the frequency of the transparency window can be flexibly adjusted by changing the Fermi energy level of graphene. A classical coupled two‐oscillator model is employed to theoretically analyze the physical mechanism of EIT‐like phenomenon, which is due to the near‐field coupling effect between the bright and the quasi‐dark modes. The proposed work will be a good candidate for the design of different graphene‐based tunable EIT devices at different frequency spectra with potential applications in optical sensors.

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