Polarization-indepentant multi-band unidirectional reflectionless propagation in non-Hermitian metamaterial

Bai, Ruiping; Liu, Shujing; Jin, Xing Ri

doi:10.1142/s0217979220502951

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…However, in practical applications, it can be cumbersome to introduce and manipulate gain factors in metamaterial platforms and to balance them with loss factors [33,34]. Recent research shows that all-passive systems without optical gain can be engineered to demonstrate EP-related phenomena [10,[35][36][37][38][39][40]. In [12], Li et al demonstrated a passive asymmetric acoustic absorber at an EP with a compact configuration and deepsubwavelength thickness which achieves EP-induced tunable asymmetric absorption.…”

Section: Introductionmentioning

confidence: 99%

Extremely asymmetric absorption and reflection near the exceptional point for three-dimensional metamaterial

Wu,

Zhang,

et al. 2024

J. Phys. D: Appl. Phys.

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In recent years, particular physical phenomena enabled by non-Hermitian metamaterial systems have attracted significant research interests. In this paper, a non-Hermitian three-dimensional metamaterial near the exceptional point (EP) is proposed to demonstrate extremely asymmetric absorption and reflection. Unlike its conventional counterparts, this proposed metamaterial is constructed with a loss-assisted design. Localized losses are introduced into the structure by combining our technique of graphene-based resistive inks with conventional printed circuit board (PCB) process. Extremely asymmetric absorption and reflection near the EP are experimentally observed by tuning the loss between split ring resonators (SRRs) in the meta-atoms. Simultaneously, by linking the equivalent circuit model (ECM) with the Hamiltonian quantum physical model, the equivalent non-Hermitian Hamiltonian is obtained and a non-Hermitian transmission matrix is constructed. We show that tuning the structure and circuit parameters of the ECM produces a metamaterial system with EP response. Our system can be used in the design of asymmetric metamaterial absorbers. Our work lays down the way for the manipulation of EP to develop perfect absorption, sensing and other applications in the 3D metamaterial platform.

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Section: Introductionmentioning

confidence: 99%

Extremely asymmetric absorption and reflection near the exceptional point for three-dimensional metamaterial

Wu,

Zhang,

et al. 2024

J. Phys. D: Appl. Phys.

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Unidirectional reflectionlessness, asymmetric reflection, and asymmetric transmission with linear and circular polarizations in terahertz metamaterial

Xu,

Lv,

Zhang

et al. 2024

AIP Advances

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We propose a structure utilizing a double-layer aluminum ring resonator embedded in a dielectric layer of metamaterial to demonstrate the appearances of unidirectional reflectionlessness, asymmetric reflection, and asymmetric transmission for the incident linear and circular polarizations. A significant feature of this structure is that it allows multiple functions to be implemented in the same structure without changing any structure parameters. For the vertical incident x- and y-polarizations, not only significant unidirectional reflectionlessness and asymmetric reflection effects are verified but also the strong linear to circular polarization conversions are illustrated in both transmission and reflection modes. For the vertical incidences of right-handed and left-handed circular polarizations, unidirectional reflectionlessness and asymmetric reflection are also demonstrated in detail. In addition, when linearly or circularly polarized waves are incident obliquely, the structure exhibits a stable asymmetric transmission phenomenon within a wide incident angle range. Furthermore, it also supports the occurrences of unidirectional reflectionlessness and asymmetric reflection stably within wide ranges of incident angle, resonator spacing, and rotation angle of the upper aluminum ring.

show abstract

Polarization-indepentant multi-band unidirectional reflectionless propagation in non-Hermitian metamaterial

Cited by 2 publications

References 34 publications

Extremely asymmetric absorption and reflection near the exceptional point for three-dimensional metamaterial

Extremely asymmetric absorption and reflection near the exceptional point for three-dimensional metamaterial

Unidirectional reflectionlessness, asymmetric reflection, and asymmetric transmission with linear and circular polarizations in terahertz metamaterial

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