Tunable dual-band liquid crystal based near-infrared perfect metamaterial absorber with high-loss metal

Kowerdziej, Rafał; Jaroszewicz, Leszek R.

doi:10.1080/02678292.2019.1618935

Cited by 28 publications

(14 citation statements)

References 27 publications

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“…Compared to other tunable absorbers [39,40], the proposed absorber has the advantage of easy fabrication, an ultrathin thickness, short response time, low absorbing frequency, and wide tunable bandwidth, which makes it promising for smart-skin applications.…”

Section: Discussionmentioning

confidence: 99%

Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications

Li²,

et al. 2019

Materials

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An ultrathin tunable absorber for the ultrahigh frequency (UHF) band is presented in this paper. The absorber is a single-layer structure based on the topology of a Salisbury screen, in which the conventional resistive layer is replaced by an active frequency-selective surface (AFSS) loaded with resistors and varactors. The reflectivity response of the absorber can be controlled by adjusting the reverse bias voltage for the varactors, which is verified by both simulated and measured results. The experimental results show that the reflectivity response of the absorber can be modulated below −10 dB over a frequency band ranging from 415 to 822 MHz. The total thickness of the absorber, 10 mm, is equivalent to only λ/72 of the lower limit frequency. The absorbing mechanism for the designed absorber is illustrated by simulating the volume loss density distributions. A detailed analysis is also carried out on the basis of these parameters, such as the AFSS shape, resistor, thickness of the foam, thickness and permittivity of the dielectric substrate, and incident angles, which contribute to the reflectivity of the AFSS absorber.

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Section: Discussionmentioning

confidence: 99%

Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications

Li²,

et al. 2019

Materials

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“…More recently, versions of hybrid [ 35 , 36 , 37 , 38 ] and all-dielectric [ 39 , 40 , 41 ] metasurfaces have been proposed, with superior qualities in terms of wave front control, transmission coefficient, and cross-polarization. Furthermore, when combined with soft materials such as liquid crystals, on-demand external control of the metacell can be obtained, resulting in addressable absorbers and switches [ 42 , 43 ]. From a simplified theoretical point of view, any metasurface is able to control the behavior of the transmitted and reflected beam by modifying it according to the spatial phase pattern contained in the unit cell.…”

Section: Introductionmentioning

confidence: 99%

Bifunctional Metamaterials Using Spatial Phase Gradient Architectures: Generalized Reflection and Refraction Considerations

Dănilă

Mănăilă-Maximean

2021

Materials

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We report the possibility of achieving normal-incidence transmission at non-normal incidence angles using thin interfaces made of metasurface structures with an appropriately-designed positive spatial phase distributions. The reported effect represents a consequence of generalized reflection and refraction, which, although having been studied for discovering exotic effects such as negative refraction, to the best of our knowledge fails to address normal incidence conditions in positive phase distribution and its underlying consequences. Normal-incidence conditions can be angle-tuned by modifying the vales of the phase distribution gradients. Furthermore, for configurations around the normal-incidence angles, the metasurface will exhibit a bifunctional behavior—either divergent or convergent. All these properties are essential for applications such as optical guiding in integrated optics, wave front sensing devices, polarization controllers, wave front-to-polarization converters, holographic sensors, and spatially-resolved polarization measurement.

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“…Planar metamaterials (PrMMs) are very thin material films that are patterned on a subwavelength scale [22]- [25]. The emergence of planar metamaterials has opened a gateway to unprecedented electromagnetic properties and functionality unattainable from naturally occurring materials, thus enabling a family of PrMM based devices such as biosensors [26]- [33], biomedical detectors [34]- [36], optical non-linear liquid sensors [37]- [40], chemical sensors [41]- [43], glucose sensors [44], [45], slow light devices [46]- [49], optical buffering [50], [51], modulator devices [52]- [54], super lenses [55], [56], cloak designs [57], [58], and switches [59], [60]. The response of PrMMs can also be engineered to mimic EM response in all frequency regimes such as visible [61]- [64], near-infrared [39], [40], [45], [65]- [68], mid-infrared [59]- [72], far-infrared [73]- [75], and THz [41], [47], [7], [77]- [80].…”

Section: Introductionmentioning

confidence: 99%

Sensing, Switching and Modulating Applications of a Superconducting THz Metamaterial

2021

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The emergence of planar metamaterials (PrMMs) has opened a gateway to unprecedented electromagnetic (EM) properties and functionality unattainable from naturally occurring materials, thus enabling a family of PrMM based devices. In this paper, a novel class of superconducting (SC) PrMM is presented and a series of THz reflectance spectral responses simulations reveals that these SC PrMM structures portend applications in a variety of temperature sensors, thermo-optical modulators, and magnetic switch devices.

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Tunable dual-band liquid crystal based near-infrared perfect metamaterial absorber with high-loss metal

Cited by 28 publications

References 27 publications

Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications

Design of a Tunable Absorber Based on Active Frequency-Selective Surface for UHF Applications

Bifunctional Metamaterials Using Spatial Phase Gradient Architectures: Generalized Reflection and Refraction Considerations

Sensing, Switching and Modulating Applications of a Superconducting THz Metamaterial

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