Ultrathin metamaterial-based perfect absorbers for VHF and THz bands

Khuyen, Bui Xuan; Tung, Bui Son; Yoo, Young Joon; Kim, Y.J.; Lãm, Vũ Đình; Yang, Jun; Lee, Y.P.

doi:10.1016/j.cap.2016.05.027

Cited by 18 publications

(11 citation statements)

References 44 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

319

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

319

205

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show abstract

“…Interestingly, the ratios between thicknesses t and lattice constant a of MPA to the operation wavelength λ at 102 MHz are optimized to be only: t / λ = 1/816 and a / λ = 1/84. These values are the smallest among the currently-published structures212223242526272829. The nature of perfect absorption can be explained by the impedance matching theory30.…”

Section: Design Results and Discussionmentioning

confidence: 96%

Miniaturization for ultrathin metamaterial perfect absorber in the VHF band

Khuyen

Tung

Yoo

et al. 2017

Sci Rep

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An efficient resolution for ultrathin metamaterial perfect absorber (MPA) is proposed and demonstrated in the VHF radio band (30–300 MHz). By adjusting the lumped capacitors and the through vertical interconnects, the absorber is miniaturized to be only λ/816 and λ/84 for its thickness and periodicity with respect to the operating wavelength (at 102 MHz), respectively. The detailed simulation and calculation show that the MPA can maintain an absorption rate over 90% in a certain range of incident angle and with a wide variation of capacitance. Additionally, we utilized the advantages of the initial single-band structure to realize a nearly perfect dual-band absorber in the same range. The results were confirmed by both simulation and experiment at oblique incidence angles up to 50°. Our work is expected to contribute to the actualization of future metamaterial-based devices working at radio frequency.

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“…Electromagnetic (EM) metamaterials (MMs) are artificial structures consisting of periodic array, which can demonstrate the unique physical phenomena when EM wave interact with the matters, and these unique physical phenomena is usually not existed in natural materials, For example, EM cloaks [1], perfect lens [2], energy harvesting [3,4], perfect absorbers [5][6][7][8][9][10][11][12][13] et al Since the first perfect MM-based absorber (MMA) was designed and fabricated [5], MMAs have increasingly attract researchers due to their various applications including RCS reduction, sensors and wireless energy transfer [14][15][16]. In the last decades, researchers have introduced various absorbers working on different frequency band, ranging from radio waves to optical light [17][18][19][20][21][22][23][24][25]. In the meantime, the bandwidth of the MMAs has gradually expanded from the single band, multiband to broadband, and even to the ultra-broadband.…”

Section: Introductionmentioning

confidence: 99%

Experimental verification of multi-band metamaterial absorber with double structured layers

Yang

Xia

2020

Mater. Res. Express

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Microwave absorbers have been attracted much more attentions in both military and civil fields nowadays. In this paper, we present a multi-band metamaterial absorber with the excellent performances of wide-angle incidence and polarization insensitivity. The designed absorber is composed of two distinct metallic layers separated by a dielectric substrate. The simulated absorptions of the absorber are 92.9%, 92.5% and 98.5% at 5.92 GHz, 6.12 GHz and 8.54 GHz, respectively. The microwave experiments are performed to verify the simulations, and the measured results are in agreement with the simulations. Surface current distribution is illustrated to investigate the physics of absorption. We believe that the designed absorber has numerous potential applications in stealth, sensing, electromagnetic absorption and thermal detectors.

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Ultrathin metamaterial-based perfect absorbers for VHF and THz bands

Cited by 18 publications

References 44 publications

Tunable and reconfigurable metasurfaces and metadevices

Tunable and reconfigurable metasurfaces and metadevices

Miniaturization for ultrathin metamaterial perfect absorber in the VHF band

Experimental verification of multi-band metamaterial absorber with double structured layers

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