Controlling phase of microwaves with active graphene surfaces

Balcı, Osman; Kakenov, Nurbek; Kocabaş, Coşkun

doi:10.1063/1.4980087

Cited by 26 publications

(20 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its absorption performance gradually improved as the operation voltage was increased (Figure d–f). Specifically, a qualified absorption bandwidth of 5 GHz (7–12 GHz) and RL min value of −68 dB with a thickness of nearly 5.5 mm can be achieved at an operational voltage of <5 V. Later, using a similar graphene‐based active Salisbury screen structure, voltage‐controlled resonant absorbance and step‐like phase shifting around the resonance frequency were realized by the same group . In addition, Sarto and co‐workers proposed a broadband adaptive two‐period dielectric Salisbury screen absorber based on graphene .…”

Section: Graphene‐based Materials For Microwave Absorptionmentioning

confidence: 99%

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Chen

Huang

et al. 2019

Advanced Optical Materials

236

View full text Add to dashboard Cite

Electromagnetic wave absorbing materials play an increasingly important role in consumer electronics and military defense. The remarkable merits of atomically thin graphene structures and their exotic optoelectronic properties provide new opportunities to design high‐performance electromagnetic wave absorbers. This progress report summarizes the recent advances in graphene‐based microwave and terahertz stealth materials. In the first section, the theory of electromagnetic wave absorption and the evaluation methods for absorption performance are briefly introduced. Then, representative graphene‐based microwave and terahertz absorber systems are presented with an emphasis on the selection of the absorbent component and structural design. In the last section, the perspectives and future research directions of this promising field are discussed.

show abstract

Section: Graphene‐based Materials For Microwave Absorptionmentioning

confidence: 99%

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Chen

Huang

et al. 2019

Advanced Optical Materials

236

View full text Add to dashboard Cite

show abstract

“…In this paper, we propose and demonstrate a kind hybrid metasurface based modulator in a more challenging case, i.e. the active modulation of transmitted wave since most of the works in microwave band were focused on the modulation of reflection [45,46]. The hybrid metasurfaces are composed of perforated metallic layers studied for extraordinary transmission [47][48][49][50] and backed with graphene-electrolyte-graphene sandwich structures.…”

Section: Introductionmentioning

confidence: 99%

Actively modulated propagation of electromagnetic wave in hybrid metasurfaces containing graphene

Nan

Yang

et al. 2020

EPJ Appl. Metamat.

View full text Add to dashboard Cite

Here we present the actively modulated transportation of electromagnetic wave through hybrid metasurfaces containing graphene. The hybrid metasurfaces are composed of patterned metallic layers of extraordinary transmission and backed with graphene-sandwich layers. With the designed metallic layer with perforated structure, we demonstrated effective modulation on the on-resonance transmission amplitude by increasing the bias voltage from 0 to 4 V to electrically tune the Fermi level as well as the sheet resistance of the graphene-sandwich structure. We also found that the modulation depth can be further improved by properly designing the perforated metallic structure. By change the geometry from cut-wire structure to the “butterfly”-like pattern we preliminarily achieved 19.2% improvement on the on-resonance transmission modulation. The measured transmittances of the active metasurfaces show good agreement with the numerical simulations with fitted graphene sheet resistances. The hybrid metasurfaces presented in this work may be deployed in a wide range of applications based on active electromagnetic or optical modulations.

show abstract

“…Recently, some tunable RCS reduction methods have been proposed to dynamically manipulate the reflected wave. For example, by introducing tunable material 22,23 or active lumped components 24,25 into the traditional radar absorbers, the absorbing efficiency or frequency can be dynamically controlled. Graphene, as a kind of two-dimensional material, has been also used to construct the tunable radar absorber.…”

Section: Introductionmentioning

confidence: 99%

Broadband and Tunable RCS Reduction using High-order Reflections and Salisbury-type Absorption Mechanisms

Song

Huang

et al. 2019

Sci Rep

View full text Add to dashboard Cite

In this paper, a broadband and tunable radar cross section (RCS) reduction structure is proposed by using the hybrid physical mechanism that is based on high-order reflections and Salisbury-type absorption. Our design combines the high-index grating structure with a traditional Salisbury screen in which the lossy sheet is made of a graphene structure. When it is illuminated by a plane wave with normal incidence, the Salisbury screen can absorb the incoming wave, and the introducing high-index grating structure could further reduce the backward scattering wave by generating high-order reflection beams, which broadens the RCS reduction bandwidth. In addition, the RCS reduction level can be dynamically controlled by tuning the surface resistance of the graphene layer. Simulated results show that the proposed structure can realize tunable RCS reduction between 4.1 and 18 GHz under normal incidence with different graphene resistances. Experimental results are in accordance with those of the simulation results. In addition, the scattering field distributions and the plots of surface power loss density have been illustrated to analyze the RCS-reduction mechanism of our structure.

show abstract

Controlling phase of microwaves with active graphene surfaces

Cited by 26 publications

References 23 publications

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Graphene‐Based Materials toward Microwave and Terahertz Absorbing Stealth Technologies

Actively modulated propagation of electromagnetic wave in hybrid metasurfaces containing graphene

Broadband and Tunable RCS Reduction using High-order Reflections and Salisbury-type Absorption Mechanisms

Contact Info

Product

Resources

About