Graphene based salisbury screen for terahertz absorber

Woo, Jeong Min; Kim, Min‐Sik; Kim, Hyun Woong; Jang, Jae‐Hyung

doi:10.1063/1.4866665

Cited by 85 publications

(27 citation statements)

References 35 publications

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“…Instead of designing the single-layer sheet resistance to cross into the absorption-dominating regime, previous experiments for unpatterned graphene devices boosted low absorbance by the addition of multilayers 32 – 35 , or by suppressing the transmission channel 36 using double-pass/reflection/“Salisbury screen” geometries 11 , 14 . Other thin film (multilayer) materials have also demonstrated remarkable control of absorption by controlling film thickness, such as niobium nitride (NbN) 37 – 39 and indium tin oxide (ITO) 40 .…”

Section: Discussionmentioning

confidence: 99%

Broadband impedance match to two-dimensional materials in the terahertz domain

et al. 2017

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The coupling of an electromagnetic plane wave to a thin conductor depends on the sheet conductance of the material: a poor conductor interacts weakly with the incoming light, allowing the majority of the radiation to pass; a good conductor also does not absorb, reflecting the wave almost entirely. For suspended films, the transition from transmitter to reflector occurs when the sheet resistance is approximately the characteristic impedance of free space (Z 0 = 377 Ω). Near this point, the interaction is maximized, and the conductor absorbs strongly. Here we show that monolayer graphene, a tunable conductor, can be electrically modified to reach this transition, thereby achieving the maximum absorptive coupling across a broad range of frequencies in terahertz (THz) band. This property to be transparent or absorbing of an electromagnetic wave based on tunable electronic properties (rather than geometric structure) is expected to have numerous applications in mm wave and THz components and systems.

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Section: Discussionmentioning

confidence: 99%

Broadband impedance match to two-dimensional materials in the terahertz domain

et al. 2017

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“…To enhance its operation bandwidth, a few graphene/quartz pairs are also stacked on the top of each other to realize the Jaumann absorber and the n = 5 device demonstrates effective wave absorption over a wide frequency range , as shown in Figure 1f . Except increasing the number of graphene layers, Jeong et al also proposed a graphene-based Salisbury screen for THz frequencies, where chemical doping is implemented to reduce the sheet resistance of their multilayer graphene [38]. As the millimeter thick dielectric spacers are used in the Salisbury and Jaumann absorbers mentioned above, it is difficult to apply electrostatic doping to the graphene layer.…”

Section: Graphene-based Salisbury and Jaumann Absorbersmentioning

confidence: 99%

Implementation of Atomically Thick Graphene and Its Derivatives in Electromagnetic Absorbers

Tian

Shi

et al. 2019

Applied Sciences

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To reduce the radar cross section at microwave frequencies, it is necessary to implement electromagnetic (EM) absorbing devices/materials to decrease the strength of reflected waves. In addition, EM absorbers also find their applications at higher spectrum such as THz and optical frequencies. As an atomic-thick two-dimensional (2D) material, graphene has been widely used in the development of EM devices. The conductivity of graphene can be electrostatically or chemically tuned from microwave to optical light frequencies, enabling the design of reconfigurable graphene EM absorbers. Meanwhile, the derivatives of graphene such as reduced graphene oxide (rGO) also demonstrate excellent wave absorbing properties when mixed with other materials. In this article, the research progress of graphene and its derivatives based EM absorbers are introduced and the future development of graphene EM absorbing devices are also discussed.

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“…The dielectric characteristics and microwave absorption properties of epoxy resin loaded with different graphene samples are presented over a frequency range from 2 to 18 GHz in Using the graphene as an optically transparent absorbing material is reported in Refs. . Han et al modeled multilayered graphene samples on polycarbonate substrate using a transmission line model and an equivalent lumped element for the graphene film.…”

Section: Introductionmentioning

confidence: 99%

Measurement of surface conductivity of graphene at W‐band

Majeed

Fickenscher

Shahpari

et al. 2019

Micro & Optical Tech Letters

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Graphene has excellent mechanical and conducting properties. Scattering parameter measurements were made in W‐band (75‐110 GHz) on 25 mm × 25 mm monolayer graphene film printed on polyethylene terephthalate (PET) substrate. From near field measurements using WR10 horn antennas the surface conductivity was de‐embedded after calibrating the s11 data against the reflection of a copper plate of same cross‐sectional dimensions as the DUT and calibrating the s21 data against horn‐to‐horn measurements. A monolayer graphene strip (20 mm × 2 mm) printed on PET substrate (25 mm × 25 mm) showed higher reflection when it was aligned with the E field of the incident radiation (as compared to H field alignment). The surface conductivity of graphene was de‐embedded from s11 measurements using standard transmission line theory and from s21 measurements using cascade matrix theory. The measured real part of the surface conductivity of graphene ranges between 0.7 and 1.8 mS/sq.

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Graphene based salisbury screen for terahertz absorber

Cited by 85 publications

References 35 publications

Broadband impedance match to two-dimensional materials in the terahertz domain

Broadband impedance match to two-dimensional materials in the terahertz domain

Implementation of Atomically Thick Graphene and Its Derivatives in Electromagnetic Absorbers

Measurement of surface conductivity of graphene at W‐band

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