Magnetically tunable Fano resonance with enhanced nonreciprocity in a ferrite-dielectric metamolecule

Wang, Xiaobo; Zhang, Guanqiao; Li, Haohua; Zhou, Ji

doi:10.1063/1.5028496

Cited by 8 publications

(3 citation statements)

References 25 publications

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“…Compared with the Mie-based dielectric metamaterials, Fano resonance produced by placing a dielectric cube into a ferrite gives excellent tunability in a variety of external magnetic fields [9]. If the dielectric cube is positioned in the center of a ferrite cuboid, it can form a magnetic tunable nonreciprocal device [10].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Field-Insensitive Anapole State in Gyromagnetic Media

Zhang,

Niu,

Zhao

et al. 2024

Frontiers in Artificial Intelligence and Applications

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In this paper, a metasurface consisting of periodic ferrite disks that shows insensitive responses to external biased magnetic field has been designed and numerically investigated. Microwave ferrite materials with high permittivity support anapole mode arising from destructive interference between electric and toroidal dipole moments. When a low external magnetic field is applied, the magnetic resonant mode splits into two chiral resonances. The transmission spectra of the anapole mode and magnetic resonant mode exhibit different trends as the external bias magnetic field is increased, but the anapole state does not change. The bias magnetic field only impacts the magnetic dipole resonance peak, according to the multipole decomposition theory, hence the anapole possesses features that are insensitive to the magnetic field. We anticipate that our study will pave the way for a variety of applications in some strong magnetic environments thanks to the magnetic field-insensitive property of the suggested metamaterial.

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Section: Introductionmentioning

confidence: 99%

Magnetic Field-Insensitive Anapole State in Gyromagnetic Media

Zhang,

Niu,

Zhao

et al. 2024

Frontiers in Artificial Intelligence and Applications

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“…Thanks to the new methods and ideas provided by the generalized Snell’s law for people to design electromagnetic metasurfaces, a large number of studies on the application of metasurfaces are emerging. With the advantages of excellent electromagnetic control ability, low profile, low loss, and easy processing, two-dimensional metasurface has been the leader in the research of metamaterials in the last ten years, which has stimulated a variety of functions and applications, such as holographic imaging [ 46 , 47 , 48 ], vortex beam [ 49 , 50 , 51 , 52 , 53 ], ultra-thin invisibility cloak [ 54 ], absorbers [ 55 , 56 , 57 ], Huygens metasurface [ 58 , 59 ], non-magnetic non-reciprocity metasurfaces [ 60 , 61 , 62 ], and so on.…”

Section: Introductionmentioning

confidence: 99%

Evolution of the Electromagnetic Manipulation: From Tunable to Programmable and Intelligent Metasurfaces

Luo

Hao

et al. 2021

Micromachines

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Looking back on the development of metamaterials in the past 20 years, metamaterials have gradually developed from three-dimensional complex electromagnetic structures to a two-dimensional metasurface with a low profile, during which a series of subversive achievements have been produced. The form of electromagnetic manipulation of the metasurface has evolved from passive to active tunable, programmable, and other dynamic and real-time controllable forms. In particular, the proposal of coding and programmable metasurfaces endows metasurfaces with new vitality. By describing metamaterials through binary code, the digital world and the physical world are connected, and the research of metasurfaces also steps into a new era of digitalization. However, the function switch of traditional programmable metamaterials cannot be achieved without human instruction and control. In order to achieve richer and more flexible function regulation and even higher level metasurface design, the intelligence of metamaterials is an important direction in its future development. In this paper, we review the development of tunable, programmable, and intelligent metasurfaces over the past 5 years, focusing on basic concepts, working principles, design methods, manufacturing, and experimental validation. Firstly, several manipulation modes of tunable metasurfaces are discussed; in particular, the metasurfaces based on temperature control, mechanical control, and electrical control are described in detail. It is demonstrated that the amplitude and phase responses can be flexibly manipulated by the tunable metasurfaces. Then, the concept, working principle, and design method of digital coding metasurfaces are briefly introduced. At the same time, we introduce the active programmable metasurfaces from the following aspects, such as structure, coding method, and three-dimensional far-field results, to show the excellent electromagnetic manipulation ability of programmable metasurfaces. Finally, the basic concepts and research status of intelligent metasurfaces are discussed in detail. Different from the previous programmable metamaterials, which must be controlled by human intervention, the new intelligent metamaterials control system will realize autonomous perception, autonomous decision-making, and even adaptive functional manipulation to a certain extent.

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“…Fano resonances have been research hotspots recently, due to their capability of providing ultra-narrow spectral linewidth and hence various potential applications such as sensing, slow light, and nano-lasing [26][27][28] . Fano resonances is viewed as a quantum interference between a discrete state and a continuum state in atomic physics 23,29,30 . The shape of Fano resonance is distinctively different from the most common observed spectral line shapes known as symmetric Lorentzian line shapes.…”

mentioning

confidence: 99%

Single-layer metasurface for ultra-wideband polarization conversion: bandwidth extension via Fano resonance

Zhang

Wang

et al. 2021

Sci Rep

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In this paper, we propose a method of designing ultra-wideband single-layer metasurfaces for cross-polarization conversion, via the introduction of Fano resonances. By adding sub-branches onto the unit cell structure, the induced surface currents are disturbed, leading to coexistence of both bright and dark modes at higher frequencies. Due to the strong interaction between the two modes, Fano resonance can be produced. In this way, five resonances in all are produced by the single-layer metasurface. The first four are conventional and are generated by electric and magnetic resonances, whereas the fifth one is caused by Fano resonance, which further extends the bandwidth. A prototype was designed, fabricated and measured to verify this method. Both the simulated and measured results show that a 1:4.4 bandwidth can be achieved for both x- and y-polarized waves, with almost all polarization conversion ratio (PCR) above 90%. This method provides an effective alternative to metasurface bandwidth extension and can also be extended to higher bands such as THz and infrared frequencies.

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Magnetically tunable Fano resonance with enhanced nonreciprocity in a ferrite-dielectric metamolecule

Cited by 8 publications

References 25 publications

Magnetic Field-Insensitive Anapole State in Gyromagnetic Media

Magnetic Field-Insensitive Anapole State in Gyromagnetic Media

Evolution of the Electromagnetic Manipulation: From Tunable to Programmable and Intelligent Metasurfaces

Single-layer metasurface for ultra-wideband polarization conversion: bandwidth extension via Fano resonance

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