2019
DOI: 10.3116/16091833/20/1/37/2019
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Wide-range tunable subwavelength band-stop filter for the far-infrared wavelengths based on single-layer graphene sheet

Abstract: 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 die… Show more

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Cited by 5 publications
(2 citation statements)
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“…However, the monolayer graphene performs poorly at absorbing light in the visible and near infrared bands, with a mere 2.3% [12][13][14], which limits the quantum efficiency and application in optoelectronic devices. Fortunately, researchers have confirmed that graphene supports surface plasmon resonance (SPR) in the far infrared and terahertz bands [15][16][17][18][19][20][21], enhancing the absorption and broadening the application scope of graphene in optoelectronic and photoelectric devices, such as in modulators, 2 of 13 filters, photoelectric detectors, optical switches, and biosensors [22][23][24][25][26][27][28][29]. Correspondingly, the lack of diversity of graphene-based photoelectric devices in the visible and near-infrared regions has received more urgent attention.…”
Section: Introductionmentioning
confidence: 99%
“…However, the monolayer graphene performs poorly at absorbing light in the visible and near infrared bands, with a mere 2.3% [12][13][14], which limits the quantum efficiency and application in optoelectronic devices. Fortunately, researchers have confirmed that graphene supports surface plasmon resonance (SPR) in the far infrared and terahertz bands [15][16][17][18][19][20][21], enhancing the absorption and broadening the application scope of graphene in optoelectronic and photoelectric devices, such as in modulators, 2 of 13 filters, photoelectric detectors, optical switches, and biosensors [22][23][24][25][26][27][28][29]. Correspondingly, the lack of diversity of graphene-based photoelectric devices in the visible and near-infrared regions has received more urgent attention.…”
Section: Introductionmentioning
confidence: 99%
“…2 shows the relation between graphene Fermi energy and applied voltage. Graphene can be regarded as a thin dielectric layer with a complex surface conductivity σ g , which is composed of intraband conductivity σ intra and interband conductivity σ inter [26], [27]. σ intra is resulted from electron-photon scattering and σ inter is from direct electron transfer.…”
Section: Methodsmentioning
confidence: 99%