Design of a tunable multiband terahertz waves absorber

Luo, Chunya; Li, Dan; Luo, Qin; Yue, Jin; Gao, Peng; Yao, Jianquan; Ling, Furi

doi:10.1016/j.jallcom.2015.08.089

Cited by 43 publications

(28 citation statements)

References 50 publications

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“…Most common ferroelectric materials used to design tunable metasurfaces are barium strontium titanate (BST), barium titanate (BTO) 125 , lithium niobate (LiNbO 3 ) 61,[126][127][128] , and strontium titanate (STO) 52,53,[129][130][131][132][133][134][135][136][137][138] . Electrical and thermal tuning of ferroelectric materials is two most commonly used approaches for realizing tunable metasurfaces by changing the dielectric constant of ferroelectric materials in paraelectric phase.…”

Section: Ferroelectric Materialsmentioning

confidence: 99%

Tunable and reconfigurable metasurfaces and metadevices

Nemati

Wang

Hong

et al. 2018

Opto-Electronic Advances

318

205

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Metasurfaces, two-dimensional equivalents of metamaterials, are engineered surfaces consisting of deep subwavelength features that have full control of the electromagnetic waves. Metasurfaces are not only being applied to the current devices throughout the electromagnetic spectrum from microwave to optics but also inspiring many new thrilling applications such as programmable on-demand optics and photonics in future. In order to overcome the limits imposed by passive metasurfaces, extensive researches have been put on utilizing different materials and mechanisms to design active metasurfaces. In this paper, we review the recent progress in tunable and reconfigurable metasurfaces and metadevices through the different active materials deployed together with the different control mechanisms including electrical, thermal, optical, mechanical, and magnetic, and provide the perspective for their future development for applications.

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Section: Ferroelectric Materialsmentioning

confidence: 99%

Tunable and reconfigurable metasurfaces and metadevices

Nemati

Wang

Hong

et al. 2018

Opto-Electronic Advances

318

205

View full text Add to dashboard Cite

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“…It is not only a resonator but it also provides magnetic coupling for the split ring resonators on the front layer. The magnetic response is provided by the antiparallel currents on both the front and back metallic layers . From the electric field distribution, it is known that outer ring is responsible for the first resonance peak at 3.0 GHz.…”

Section: Resultsmentioning

confidence: 99%

“…The magnetic response is provided by the antiparallel currents on both the front and back metallic layers. 45 From the electric field distribution, it is known that outer ring is responsible for the first resonance peak at 3.0 GHz. From the surface current distribution at 3.0 GHz, the direction of the current of the outer ring is upward in the positive y direction whereas the direction of the current in the slot structure is in the opposite direction, which is 3 Simulated and experimental absorption (in percentage) at peak absorption frequencies for different modes Meta-material n o = 1 (peak 1) n i = 1 (peak 2) n o = 3 (peak 3) n i = 3 (peak 4)…”

Section: Electric Field and Surface Current Distributionmentioning

confidence: 99%

Multiband metamaterial microwave absorbers using split ring and multiwidth slot structure

Sim

You

Esa

et al. 2018

Int J RF Microw Comput Aided Eng

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This article proposes a multiband metamaterial microwave absorber based on a split ring‐slot structure. Both simulation and experimental measurements are carried out to obtain the scattering parameters which are used to retrieve the absorption coefficient, relative permittivity, and relative permeability. The influences on the absorption produced by geometrical dimensions, incidence angles and polarisation angles are investigated from 1.5 to 18.0 GHz. The results show that the absorber possesses three resonance peaks with absorption greater than 70% measured experimentally at 3.0, 5.8, and 11.0 GHz. The absorption performance is insensitive to the angle of incidence, θ up to 60°.The absorption mechanisms are studied based on the surface current distribution, electric field distribution, and constitutive parameters (μ r and ε r). Furthermore, a mechanical mean using dielectric material to tune the absorption frequencies (up to 1.0 GHz of tuning range) and enhance the absorption bandwidth (up to 50%) is demonstrated.

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“…Currently, with the development of terahertz technology in radars and communications, the response of materials to terahertz waves has received widespread attention. Hence, ceramic materials applied in the corresponding devices are of great importance . At high frequencies, the response mechanism of ceramic materials to terahertz waves is considered to be similar to the response to the microwave band, and some corresponding studies can be considered.…”

Section: Introductionmentioning

confidence: 99%

Bond theory, terahertz spectra, and dielectric studies in donor‐acceptor (Nb‐Al) substituted ZnTiNb₂O₈ system

Luo

et al. 2019

J Am Ceram Soc

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As a donor and acceptor separately, Nb 5+ and Al 3+ are used to substitute Ti 4+ in the ixiolite ZnTiNb 2 O 8 system for the first time. The dielectric responses in the terahertz range of this system are initially studied based on the data from terahertz time-domain transmitted spectroscopy. Combined with ligand field theory, the formation of a secondary phase of ZnAl 2 O 4 is reasonably explicated. Then, the origins of the lower dielectric loss and the terahertz wave absorption coefficient are determined to be the high chemical bond covalency and effective phase control. For the composition of ZnTi 0.85 (Al 0.5 Nb 0.5 ) 0.15 Nb 2 O 8 sintered at 1180°C, a low dielectric loss (<5 × 10 −3 @ 0.5 THz) and absorption coefficient (<10/cm @ 0.5 THz) are obtained, which make this kind of material propitious for developing terahertz dielectric devices. K E Y W O R D S complex chemical bond theory, covalency, dielectric properties, donor-acceptor substituted, microwave and terahertz

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Design of a tunable multiband terahertz waves absorber

Cited by 43 publications

References 50 publications

Tunable and reconfigurable metasurfaces and metadevices

Tunable and reconfigurable metasurfaces and metadevices

Multiband metamaterial microwave absorbers using split ring and multiwidth slot structure

Bond theory, terahertz spectra, and dielectric studies in donor‐acceptor (Nb‐Al) substituted ZnTiNb₂O₈ system

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Design of a tunable multiband terahertz waves absorber

Cited by 43 publications

References 50 publications

Tunable and reconfigurable metasurfaces and metadevices

Tunable and reconfigurable metasurfaces and metadevices

Multiband metamaterial microwave absorbers using split ring and multiwidth slot structure

Bond theory, terahertz spectra, and dielectric studies in donor‐acceptor (Nb‐Al) substituted ZnTiNb2O8 system

Contact Info

Product

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Bond theory, terahertz spectra, and dielectric studies in donor‐acceptor (Nb‐Al) substituted ZnTiNb₂O₈ system