Cascaded PT-symmetric artificial sheets: multimodal manipulation of self-dual emitter-absorber singularities, and unidirectional and bidirectional reflectionless transparencies

Yang, Minye; Ye, Zhilu; Farhat, Mohamed; Chen, Pai‐Yen

doi:10.1088/1361-6463/ac3300

Cited by 8 publications

(4 citation statements)

References 52 publications

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“…Consider the PT-symmetric metasurfaces in Fig. 7(a) [121][122][123][124], gain and loss separated by a dielectric spacer represented by an active metasurface with surface conductance G gain = −ηY 0 and a passive metasurface with G loss = ηY 0 where η is the dimensionless gain-loss factor, and Y 0 is the characteristic admittance of free space. This PT optical system can be modeled using an equivalent transmission line network model shown in Fig.…”

Section: Coherent Perfect Absorber-laser-enabled Sensingmentioning

confidence: 99%

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Yang,

Ye,

Chen

et al. 2024

PIER B

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Parity-time (PT) reversal symmetry, as a representative example in the field of non-Hermitian physics, has attracted widespread research interest in the past few years due to its extraordinary wave dynamics. PT symmetry enables unique spectral singularities including the exceptional point (EP) degeneracy where two or more eigenvalues and eigenvectors coalesce, as well as the coherent perfect absorber-laser (CPAL) point where laser and its time-reversal counterpart (i.e., coherent perfect absorber) can coexist at the same frequency. These singular points not only give rise to new physical phenomena but also provide new plausibility for building the nextgeneration sensors and detectors with unprecedented sensitivity. To date, investigations into EPs and CPAL points have unveiled their great potential in various sensing scenarios across a broad spectral range, spanning optics, photonics, electronics, and acoustics. In this review article, we will discuss ongoing developments of EP-and CPAL-based sensors composed of PT-synthetic structures and offer a glimpse into the future research directions in this emerging field.

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Section: Coherent Perfect Absorber-laser-enabled Sensingmentioning

confidence: 99%

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Yang,

Ye,

Chen

et al. 2024

PIER B

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“…We note that x offers great flexibility in designing the telemetry system. The phase transition in the PTX-symmetric system can be understood from the evolution of eigenvalues of S, bidirectional gigantic reflection [43], [51], [52]. Such a singularity existing in the broken symmetry phase is named as the CPA-laser (CPAL) point.…”

Section: A Theory Of Ptx-symmetry Enabled Icp Monitoringmentioning

confidence: 99%

In-Vitro Demonstration of Ultra-Reliable, Wireless and Batteryless Implanted Intracranial Sensors Operated on Loci of Exceptional Points

Yang

Alsaab

et al. 2022

IEEE Trans. Biomed. Circuits Syst.

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Vital signal monitoring, such as pulse, respiration rate, intra-organ and intra-vascular pressure, can provide important information for determination of clinic diagnosis, treatments, and surgical protocols. Nowadays, micromachined bioimplants, equipped with antennas for converting bio-signals to modulated radio transmissions, may allow remote continuous monitoring of patients' vital signs. Yet, current passive biotelemetry techniques usually suffer from poor signal reproducibility and robustness in light of inevitable misalignment between transmitting and receiving antennas. Here, we seek to address this long-existing challenge and to robustly acquire information from a passive wireless intracranial pressure (or brain pressure) sensor by introducing a novel, high-performance biotelemetry system. In spite of variable inductive links, this biotelemetry system may have absolute accuracy by leveraging the uniqueness of loci of exceptional points (EPs) in non-Hermitian radio-frequency (RF) electronic systems with parity-time (PT) symmetry. Our in-vitro experimental demonstration shows that the proposed intracranial pressure (ICP) monitoring system can provide a sub-mmHg resolution in the ICP range of 0-20 mmHg and ultra-robust wireless data acquisition against the misalignment-induced weakening of inductive link. Our results could provide a practical pathway toward reliable, real-time wireless monitoring of ICP, and other vital signals generated by bio-implants and wearables.

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“…In these non-conservative situations, the rich physics of non-Hermitian systems have been revealed. As a result, a series of attractive applications of counter-intuitive wave phenomena have been unlocked, such as laser-absorber [7,8], unidirectional reflectionless transmission [9,10], extreme asymmetric reflection/absorption [11,12], single laser-mode selection [13,14]. The exceptional point (EP) is one ubiquitous concept in non-Hermitian physics which was first proposed by Bender and Boettcher [15].…”

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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Cascaded PT-symmetric artificial sheets: multimodal manipulation of self-dual emitter-absorber singularities, and unidirectional and bidirectional reflectionless transparencies

Cited by 8 publications

References 52 publications

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

Recent Advances in Parity-time Symmetry-enabled Electromagnetic Sensors

In-Vitro Demonstration of Ultra-Reliable, Wireless and Batteryless Implanted Intracranial Sensors Operated on Loci of Exceptional Points

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

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