Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Barzegar-Parizi, Saeedeh; Ebrahimi, Amir

doi:10.3390/electronics10151860

Cited by 13 publications

(6 citation statements)

References 49 publications

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“…Absorbers are fundamental components in various telecommunication, sensing, and imaging systems operating in a broad range of spectrum from microwave up to terahertz and optical frequencies 1 – 15 . Metamaterials-inspired structures are attractive choices in many of such applications due to their thin profiles, near perfect absorption, and flexibility in designing both narrow and wideband absorption characteristics 1 – 7 . Metamaterial absorbers are conventionally implemented in three-layer configurations made of metamaterial patterned layer, a dielectric spacer and a bottom metallic layer that acts as a perfect reflector.…”

Section: Introductionmentioning

confidence: 99%

Two bits dual-band switchable terahertz absorber enabled by composite graphene and vanadium dioxide metamaterials

Barzegar-Parizi,

Ebrahimi,

Ghorbani

2024

Sci Rep

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This article presents the design of a 2-bit dual-band switchable terahertz absorber using a stacked combination of graphene and vanadium dioxide (VO2) metamaterials. For the first time, the proposed absorber design offers four switchable states by controlling the conductivity of graphene and VO2 metamaterial layers. The lower absorption band is produced by the graphene metamaterial, whereas the upper band is implemented by the VO2 metamaterial pattern. The structure shows two absorption bands (State 11) at 0.745–0.775 THz and 2.3–5.63 THz, when the Fermi graphene level of graphene is 0.2 eV and the VO2 is in the metallic phase. The lower absorption band is turned off, while keeping the upper band (State 01), when the graphene Fermi level is 0 eV and the VO2 layer is in the metallic phase. The upper absorption band is turned off, while preserving the lower absorption band (State 10) by switching the VO2 into the insulator phase and keeping the graphene Fermi level at 0.2 eV. Finally, both of the absorption bands are turned off by setting the graphene Fermi level to 0 eV and switching the VO2 into the insulating phase. Equivalent circuit modelling analysis and full-wave electromagnetic simulations are used to explain the operation principle of the proposed absorber. Very good agreement is obtained between the theoretical analysis and the simulations confirming the presented design principle for the 2-bit switchable absorber.

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Section: Introductionmentioning

confidence: 99%

Two bits dual-band switchable terahertz absorber enabled by composite graphene and vanadium dioxide metamaterials

Barzegar-Parizi,

Ebrahimi,

Ghorbani

2024

Sci Rep

Self Cite

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“…Since, Landy et al [11] provided the first simulated and numerical verification of an ideal metamaterial absorber (MA) in 2008, various types of MAs have been developed and explored. Absorbers with single, dual, and multiband responses have been used in recent years [12][13][14][15][16][17]. The large size of these nanostructures, however, increases the system size due to the large variation in the band gap of the components, and manufacture of these nanostructures is a complex procedure [18].…”

Section: Introductionmentioning

confidence: 99%

Graphene-based ultra-wideband absorber for terahertz applications using hexagonal split ring resonators

Upender¹,

Kumar²

2022

Phys. Scr.

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In this paper, a hexagonal split ring ultra-wideband absorber is proposed at THz frequency. The proposed structure consists of four graphene based hexagonal split rings, a dielectric substrate and graphene layer at the bottom. The proposed absorber achieves an ultra-wideband absorption characteristics from 0.95 THz to 2.96 THz with percentage bandwidth of 102.8% and bandwidth of 2.1THz with absorptivity beyond 90%. Also, 100% absorption is achieved from 2.07 to 2.33 THz making this unique feature for THz applications. Ultra-wideband response is mainly resulted because of overlapping of strong Electromagnetic (EM) resonance of the four split rings. The modes generated within the graphene split rings are merged for achieving ultra wide band response. Furthermore, the proposed absorber is polarization insensitive because of symmetry geometry and also exhibits absorption greater than 90% for incidence angle up to 75o for both TE and TM waves. In addition, tunability is achieved by varying the graphene chemical potential. These features make the proposed metal free absorber useful for terahertz applications and future nanoscale systems. The proposed absorber shows narrow absorption characteristics for higher graphene chemical potential values which can also be utilized for sensor applications.

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“…Plasmonic structures possessing the capability of wave manipulation are very necessary for terahertz (THz) * Authors to whom any correspondence should be addressed. applications such as filter [1][2][3], sensing [4], imaging [5], and absorber [6,7]. Free-standing metal hole arrays (MHAs) and metal gratings (MGs) are simplified plasmonic structures with extraordinary optical properties that are investigated frequently [8].…”

Section: Introductionmentioning

confidence: 99%

High-quality resonances in terahertz composite slabs based on metal gratings

Liu¹,

Xi²,

Wu³

et al. 2022

J. Opt.

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In this study, a terahertz composite slab (TCS) based on metal grating and dielectric films is experimentally and numerically investigated in the terahertz region. By combining a dielectric film, the TCS exhibits different sharp resonances for varied polarization waves. A sharp Fano resonance is excited for transverse magnetic (TM) waves, which originates from the introduced asymmetric factor by dielectric films. The film thickness and refractive index can be used for the Fano resonance tuning. The resonant Q-factor can be improved using thinner and lower refractive index films. For transverse electric (TE) modes, a resonance termed guided modes can also be induced when the dielectric film is thick enough. The effects of film thickness and refractive index on these resonances are analyzed in detail. These results demonstrated that this TCS with high Q-factors or narrow resonances for both TM and TE waves is a promising component for THz filter and sensor applications.

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Terahertz High-Q Absorber Based on Holes Array Perforated into a Metallic Slab

Cited by 13 publications

References 49 publications

Two bits dual-band switchable terahertz absorber enabled by composite graphene and vanadium dioxide metamaterials

Two bits dual-band switchable terahertz absorber enabled by composite graphene and vanadium dioxide metamaterials

Graphene-based ultra-wideband absorber for terahertz applications using hexagonal split ring resonators

High-quality resonances in terahertz composite slabs based on metal gratings

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