All-graphene perfect broadband THz absorber

Baah, Marian; Paddubskaya, Alesia; Novitsky, Andrey; Valynets, N.; Kumar, Mukesh; Itkonen, Tommi; Pekkarinen, Markku; Soboleva, Ekaterina; Lähderanta, E.; Kafesaki, Maria; Svirko, Yuri; Kuzhir, P.

doi:10.1016/j.carbon.2021.09.067

Cited by 29 publications

(14 citation statements)

References 13 publications

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“…We have demonstrated [19] that a complex fabrication procedure of graphene metasurface involving 3D printing, electroplating, graphene synthesis and transfer allows a plenty of room for introducing imperfections to the meta-atoms structure. In particular, in the fabricated array of graphene hemispheres with the characteristic size of 200-600 microns, a considerable proportion of hemispheres may be completely or partially damaged being either holes or volcano-like structures, respectively (see Figs.…”

Section: Unit Cells Of Cylindrical Symmetrymentioning

confidence: 99%

“…In the following analysis we assume 𝑤 1 = 0.6, 𝑤 2 = 0.35, and 𝑤 3 = 0.05, which corresponds to the metasurface studied in [19]. Comparing the results of modeling presented in Fig.…”

Section: Random Metasurfacesmentioning

confidence: 99%

“…The samples of free-standing metasurface composed of graphene hemispheres have been fabricated as described in [19], see Figs. 1b-e.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

“…we may consider graphene metasurface in the free space (𝑛 1 = 𝑛 2 = 1). In order to account piecewise nature of multi-layered graphene made on electroplated Ni template [19], comprising single and two-layers graphene domains, we will modify Eq. ( 14) for the surface conductivity as follows…”

Section: Comparison To Experimentsmentioning

confidence: 99%

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Random Graphene Metasurfaces: Diffraction Theory and Giant Broadband Absorptivity

et al. 2022

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We introduce diffraction-theory-inspired analytic description of the metasurface comprising an array of graphene subwavelength hemispheres. Our theory describes light interaction with the random metasurface, in which the periodicity is broken by accidentally damaged meta-atoms in the nodes of a two-dimensional periodic lattice. Both numerical modeling and experiment show that such a nm-thin metasurface possesses giant broadband absorption in the THz spectral range that remains intact even when a substantial portion of meta-atoms, i.e. graphene hemispheres, is damaged. Moreover, defective fabrication of graphene free-standing metasurface may enhance the absorptive properties.

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Section: Unit Cells Of Cylindrical Symmetrymentioning

confidence: 99%

Section: Random Metasurfacesmentioning

confidence: 99%

“…The samples of free-standing metasurface composed of graphene hemispheres have been fabricated as described in [19], see Figs. 1b-e.…”

Section: Comparison To Experimentsmentioning

confidence: 99%

Section: Comparison To Experimentsmentioning

confidence: 99%

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Random Graphene Metasurfaces: Diffraction Theory and Giant Broadband Absorptivity

et al. 2022

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“…As we all know, conductive materials can easily construct conductive paths to ensure EMI shielding. To date, a wide range of conductive materials such as nanometal, carbon-based materials, − and conductive polymers have been used to prepare EMI shielding materials. Carbon nanomaterials are widely used in electromagnetic shielding due to their high specific surface area, low density, good electrical conductivity, and high chemical stability .…”

Section: Introductionmentioning

confidence: 99%

Absorption-Dominant, Low-Reflection Multifunctional Electromagnetic Shielding Material Derived from Hydrolysate of Waste Leather Scraps

Gao

Guo

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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High-performance flexible conductive films are highly promising for the development of wearable devices, artificial intelligence, medical care, etc. Herein, a three-step procedure was developed to produce electromagnetic interference (EMI) shielding, Joule heating, and a hydrophobic nanofiber film based on hydrolysate of waste leather scraps (HWLS): (i) electrospinning preparation of the HWLS/polyacrylonitrile (PAN)/ zeolitic imidazolate framework-67 (ZIF-67) nanofiber film, (ii) carbonization of the HWLS/PAN/ZIF-67 nanofiber film, and (iii) coating of the carbon nanofiber@cobalt (Co@CNF) nanofiber film with perfluorooctyltriethoxysilane (POTS). The X-ray diffraction results showed that metal nanoparticles and amorphous carbon had obvious peaks. The micromorphology results showed that metal nanoparticles were coated with carbon nanofibers. The conductivity and shielding efficiency of the carbon nanofiber film with 250 μm thickness could reach 45 S/m and 49 dB, respectively, and absorption values (A > 0.5) were higher than reflection (R) values for the Co@CNF nanofiber film, which indicated that the contribution of absorption loss was more significant than that of reflection loss. Ultrafast electrothermal response performances were also achieved, which could guarantee the normal functioning of films in cold conditions. The water contact angle of the Co@CNF@POTS nanofiber film was ∼151.3°, which displayed a self-cleaning property with water-proofing and antifouling. Absorption-dominant and low-reflection EMI shielding and electrothermal films not only showed broad application potential in flexible wearable electronic devices but also provided new avenues for the utilization of leather solid waste.

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Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

Wang

Duan

et al. 2023

Adv Funct Materials

111

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Metamaterial absorbers have been widely studied and continuously concerned owing to their excellent resonance features of ultra-thin thickness, light-weight, and high absorbance. Their applications, however, are typically restricted by the intrinsic dispersion of materials and strong resonant features of patterned arrays (mainly referring to narrow absorption bandwidth). It is, therefore essential to reassert the principles of building broadband metamaterial absorbers (BMAs). Herein, the research progress of BMAs from principles, design strategies, tunable properties to functional applications are comprehensively and deeply summarized. Physical principles behind broadband absorption are briefly discussed, typical design strategies in realizing broadband absorption are further emphasized, such as top-down lithography, bottom-up self-assembly, and emerging 3D printing technology. Diversified active components choices, including optical response, temperature response, electrical response, magnetic response, mechanical response, and multi-parameter responses, are reviewed in achieving dynamically tuned broadband absorption. Following this, the achievements of various interdisciplinary applications for BMAs in energy-harvesting, photodetectors, radar-IR dual stealth, bolometers, noise absorbing, imaging, and fabric wearable are summarized. Finally, the challenges and perspectives for future development of BMAs are discussed.

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All-graphene perfect broadband THz absorber

Cited by 29 publications

References 13 publications

Random Graphene Metasurfaces: Diffraction Theory and Giant Broadband Absorptivity

Random Graphene Metasurfaces: Diffraction Theory and Giant Broadband Absorptivity

Absorption-Dominant, Low-Reflection Multifunctional Electromagnetic Shielding Material Derived from Hydrolysate of Waste Leather Scraps

Review of Broadband Metamaterial Absorbers: From Principles, Design Strategies, and Tunable Properties to Functional Applications

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