Reconfigurable parity-time symmetry transition in phase change metamaterials

Cao, Tun; Cao, Ying; Fang, Linhan

doi:10.1039/c9nr01828j

Cited by 18 publications

(10 citation statements)

References 64 publications

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“…Utilizing those tunable materials, as a part of the structure design, can also be a strategy to realize the modification of metasurface. Phasechange materials (PCMs), such as the GeSbTe (short for GST) alloys, suffer from significant optical parameters variation between the amorphous and crystalline states, and thus recently being used to modify the optical properties of metasurface [15,25,30]. Galarreta et al embedded a thin layer of GST into silicon nanodisks and realized the modification of resonance [129].…”

Section: Structures With Tunable Materialsmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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Metamaterials are composed of periodic subwavelength metallic/dielectric structures that resonantly couple to the electric and magnetic fields of the incident electromagnetic waves, exhibiting unprecedented properties which are most typical within the context of the electromagnetic domain. However, the practical application of metamaterials is found challenging due to the high losses, strong dispersion associated with the resonant responses, and the difficulty in the fabrication of nanoscale 3D structures. The optical metasurface is termed as 2D metamaterials that inherent all of the properties of metamaterials and also provide a solution to the limitation of the conventional metamaterials. Over the past few years, metasurfaces; have been employed for the design and fabrication of optical elements and systems with abilities that surpass the performance of conventional diffractive optical elements. Metasurfaces can be fabricated using standard lithography and nanoimprinting methods, which is easier campared to the fabrication of the counterpart 3 days metamaterials. In this review article, the progress of the research on metasurfaces is illustrated. Concepts of anomalous reflection and refraction, applications of metasurfaces with the Pancharatanm-Berry Phase, and Huygens metasurface are discussed. The development of soft metasurface opens up a new dimension of application zone in conformal or wearable photonics. The progress of soft metasurface has also been discussed in this review. Meta-devices that are being developed with the principle of the shaping of wavefronts are elucidated in this review. Furthermore, it has been established that properties of novel optical metasurface can be modulated by the change in mechanical, electrical, or optical stimuli which leads to the development of dynamic metasurface. Research thrusts over the area of tunable metasurface has been reviewed in this article. Over the recent year, it has been found that optical fibers and metasurface are coagulated for the development of optical devices with the advantages of both domains. The metasurface with lab-on fiber-based devices is being discussed in this review paper. Finally, research trends, challenges, and future scope of the work are summarized in the conclusion part of the article.‬‬‬‬‬‬‬

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Section: Structures With Tunable Materialsmentioning

confidence: 99%

A Review on Metasurface: From Principle to Smart Metadevices

et al. 2021

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“…Furthermore, an abrupt phase change of π happened at the EP, which has promising sensing applications. On the other hand, by adopting phase-change materials, such as VO 2 and chalcogenide glass, or by exploring superconducting transition of metal, one can tune the refractive index or dissipative loss of the materials in constructing metasurfaces, hence allowing us to tune the parity-time phase transition. , With the tunability and sensitivity of EP demonstrated, it is expected that EP can act as a driving mechanism in achieving tunable metasurfaces in future so that tiny change of geometric parameters can dramatically tune the optical functionality.…”

Section: Non-hermitian Metasurfacesmentioning

confidence: 99%

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Fan

Liang

et al. 2022

ACS Photonics

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Metasurfaces, benefiting from the flexibility in engineering the resonance, near-field, symmetry, and scattering properties of individual building blocks, are promising not only for a wide range of practical applications in the classical linear optical regime, but also facilitate research into new unconventional areas. Very recently, we have been witnessing the second quantum revolution in which quantum information processing and computation are becoming a reality. In this review, we will focus on some of the emerging developments of metasurfaces that work in the nonlinear, non-Hermitian, nonclassical, or quantum regime. We review some of the common principles shared by the development of these metasurfaces, including local field enhancement and the consideration of structure, lattice, and time-reversal symmetries.

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“…Non-Hermitian metasurfaces for polarization control, usually constructed by coupled split-ring resonators, render the PT-symmetric phase transition effect by modulating the system parameters such as the resonance frequencies and dissipation loss rates of resonators, and their intercellular coupling strength [34,64]. For example, Lawrence et al proposed a loss-assisted non-Hermitian metasurface with PT-phase transition in polarization space [39].…”

Section: Polarization Controlmentioning

confidence: 99%

Non-Hermitian Electromagnetic Metasurfaces at Exceptional Points (Invited Review)

Li¹,

Cao²,

Li³

et al. 2021

PIER

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Exceptional points are spectral singularities in non-Hermitian systems at which two or more eigenvalues and their corresponding eigenvectors simultaneously coalesce. Originating from quantum theory, exceptional points have attracted significant attention in optics and photonics because their emergence in systems with nonconservative gain and loss elements can give rise to many counterintuitive phenomena. Metasurfaces -two-dimensional artificial electromagnetic materials structured at the subwavelength scale -can provide a versatile platform for exploring such non-Hermitian phenomena through the addition of dissipation and amplification within their unit cells. These concepts enable a wide range of exotic phenomena, including unidirectional propagation, adiabatic mode conversion, and ultrasensitive measurements, which can be harnessed for technological applications. In this article, we review the recent advances in exceptional-point and non-Hermitian metasurfaces. We introduce the basic theory of exceptional point and non-Hermiticity in metasurfaces, highlight important achievements and applications, and discuss the future opportunities of non-Hermitian metasurfaces from basic science to emerging technologies.

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Reconfigurable parity-time symmetry transition in phase change metamaterials

Abstract: Reconfigurable parity-time symmetry transition in GeTe based metamaterials by switching the structural state of GeTe between amorphous and crystalline.

Cited by 18 publications

References 64 publications

A Review on Metasurface: From Principle to Smart Metadevices

A Review on Metasurface: From Principle to Smart Metadevices

Emerging Trend in Unconventional Metasurfaces: From Nonlinear, Non-Hermitian to Nonclassical Metasurfaces

Non-Hermitian Electromagnetic Metasurfaces at Exceptional Points (Invited Review)

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