Zero-index and hyperbolic metacavities: fundamentals and applications

Guo, Zhiwei; Jiang, Haitao; Chen, Hong

doi:10.1088/1361-6463/ac2e89

Cited by 40 publications

(19 citation statements)

References 388 publications

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“…In addition to that the intensity of the Bessel beam can be enhanced by the collective radiation of the multiple excitation sources, multi-channel Bessel beam is also a significant advantage of the ZIM metalens due to the uniformed field in the ZIM structure [65]. The schematic of anisotropic ENZ structure with four concave exit surfaces is shown in Fig.…”

Section: Multichannel Bessel Beams Generated By the Zim Metalensmentioning

confidence: 99%

Bessel Beam Generated by the Zero-Index Metalens

Deng¹,

Z²,

Ren³

et al. 2022

PIER

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Bessel beam is an important propagation-invariant optical field. The size and shape of its central spot remain unchanged in the long-distance transmission process, which has a wide application prospect. In this paper, we find that zero-index media (ZIM) metalen can be designed to realize the unique Bessel beam. On the one hand, based on the metal-dielectric multilayered structure with subwavelength unit cells, the anisotropic epsilon-near-zero media (ENZ) metalen is proposed for generating the robust Bessel beam, which is immune to the defects placed in the transmission path or the inside of the structure. The ZIM metalens uncover that ENZ media provide a new way to generate Bessel beams beyond the conventional convex prisms. On the other hand, with the help of the uniform field distribution of ZIM, enhanced (multi-channel) Bessel beams based on multiple point sources (exit surfaces) are studied in the isotropic ENZ metalens. In addition, the Bessel beam generated by the ZIM metalen has also been extend to the epsilon-mu-near zero metamaterial realized by two-dimensional photonic crystals. Our results not only provide a new way to generate Bessel beam based on the ZIM metalens, but also may enable their use in some optical applications, such as in fluorescence microscopy imaging, particle trapping, and wave-front tailoring.

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Section: Multichannel Bessel Beams Generated By the Zim Metalensmentioning

confidence: 99%

Bessel Beam Generated by the Zero-Index Metalens

Deng¹,

Z²,

Ren³

et al. 2022

PIER

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“…Defects in photonic crystals can greatly localize the electric field [ 29 ]. Defects in Cantor crystals can tremendously enhance the localization of electric field as well, which results in the optical fractal effect in aperiodic structures.…”

Section: Optical Fractal Effectmentioning

confidence: 99%

Photonic passbands induced by optical fractal effect in Cantor dielectric multilayers

et al. 2022

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We investigate the splitting and incorporation of optical fractal states in one-dimensional photonic quasi-crystals. The aperiodic crystals which are composed of two different dielectrics submit to Cantor sequence. Defects in Cantor crystals can greatly enhance the localization of electric field, which induces the optical fractal effect. The number of optical fractal states increases exponentially with the generation number of Cantor sequence. Moreover, the optical fractal characteristics depend on the incident angle of light, of which the fractal states may split/incorporate by modulating the value of incident angle. This study could be utilized for band-pass filters and reflectors.

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“…In particular, meta-atoms have a strong ability to control electromagnetic (EM) waves, which will greatly enrich the design methods of optical topological insulators [13]. As an important class of meta-atoms, split-ring resonators (SRRs) have been widely used in the design of left-handed media [14,15], zero-index media [16,17] and hyperbolic media [18,19] with novel EM wave regulation functions. Compared with metal disk and other EM resonators, the coupling strength between SRRs depends not only on the separation distance [20], but also on the relative rotation angle of the slits of two neighboring resonators [21].…”

Section: Introductionmentioning

confidence: 99%

Rotation controlled topological edge states in a trimer chain composed of meta-atoms

Guo

Wang

et al. 2022

New J. Phys.

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Recently, topological chains have attracted extensive attention because of their simple structure, rich physics and important applications. In this work, we theoretically and experimentally uncover that the abundant topological phases of periodic trimer chain composed of one kind of meta-atom, namely split-ring resonators (SRRs), can be flexibly controlled by tunning the rotation angle of SRRs. On the one hand, we study the rotation controlled phase transition between two topological distinguished trimer chains with inversion symmetry. The generation of symmetric edge states can be easily controlled in this phase transition. On the other hand, the topological phases of the trimer chain broken inversion symmetry is demonstrated. Especially, the rotation controlled asymmetric edge states are observed in this process. So, rotation provides a new degree of freedom to manipulate edge states in the trimer chain composed of SRRs. The results in this work not only provide a flexible way to observe controlled edge states, but also provide a good research platform for designing other topological models with complex coupling distributions.

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Zero-index and hyperbolic metacavities: fundamentals and applications

Cited by 40 publications

References 388 publications

Bessel Beam Generated by the Zero-Index Metalens

Bessel Beam Generated by the Zero-Index Metalens

Photonic passbands induced by optical fractal effect in Cantor dielectric multilayers

Rotation controlled topological edge states in a trimer chain composed of meta-atoms

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