Chiral exceptional points in metasurfaces

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August undefined, 2024

WebSep 13, 2024 · Here, we report on the experimental realization of true/intrinsic chiral response with resonant metasurfaces where the engineered slant geometry breaks both … WebDec 1, 2024 · Farhi, A. Mekawy, A. Alù, and D. Stone, “ Excitation of Absorbing Exceptional Points in the Time Domain ... A. Alù, Y. S. Kivshar, and X. Li, “ Planar Chiral Metasurfaces With Maximal Tunable Chiroptical Response ... of an Exceptional Point for Highly Efficient and Compact Chiral Mode Converters,” Nature ...

Non-Hermitian chiral degeneracy of gated graphene metasurfaces

WebDielectric metasurfaces have emerged as a powerful platform for novel optical biosensors. Due to their low optical loss and strong light–matter interaction, they demonstrate several exotic optical properties, including sharp resonances, strong near-field enhancements, and the compelling capability to support magnetic modes. They also … WebSep 8, 2024 · The main concept underpinning our resonant chiral metasurfaces ( Fig. 1A) was created by a square lattice of tilted titanium dioxide (TiO 2) bars placed on a 13-nm indium tin oxide (ITO)–coated … porcher e3258

Non-Hermitian chiral degeneracy of gated graphene metasurfaces

WebAn exceptional point (EP) is a degeneracy occurring in a non-energy-conserving system, in which two eigenvectors of a non-Hermitian Hamiltonian coalesce. We explore how EPs … WebWe experimentally demonstrate an electrical and spectral way of accessing the chiral EPs with non-Hermitian gate-controlled graphene metasurfaces. This work reveals the EP … WebSep 1, 2024 · From a fundamental perspective, a metasurface is an open system, continuously exchanging and/or absorbing energy between the impinging field and the … porcher e8991

Chiral exceptional points in metasurfaces (2016) Ming Kang 25 …

High-order exceptional points in non-Hermitian Moiré lattices

WebSep 1, 2024 · Abstract. We investigate the exceptional points (EPs) in chiral metasurfaces composed of periodic arrays of two orthogonally orientated graphene strips in the … Webthe continuum with near-unity chiral dichroism of 0.93 and record-high quality factor exceeding 2663 for visible frequencies. Our chiral metasurfaces promise a plethora of applications in chiral light sources and detectors, chiral sensing, valleytronics and asymmetric photocatalysis. Collins, 2024 #2690. Lodahl, 2024 #3102. Parappurath, 2024 … porcher e902801WebSep 8, 2024 · The chiral microlasers can have large DOPs and directional output, but only in specific power ranges. ... At the C points, ... Chiral emission from resonant metasurfaces, Science (2024). DOI: 10. ... sharon und christian lets dance

"WebSep 9, 2024 · The field of non-Hermitian physics provides a fertile ground for studying unconventional physical phenomena in open systems (1, 2).Many of the most intriguing phenomena occur at exceptional points … " - Chiral exceptional points in metasurfaces

Chiral exceptional points in metasurfaces

Exceptional points in optics and photonics Science

WebWe investigate the exceptional points (EPs) in chiral metasurfaces composed of periodic arrays of two orthogonally orientated graphene strips in the terahertz frequency. By tuning the geometric parameters and incident wavelengths, the EPs emerge as two eigenvalues of the transmission matrix coalesce. The EPs possess a certain chirality as light at the … WebJun 4, 2024 · This extraordinary chiroptical response is achieved through band folding that enables coupling of incident light to spin-polarized flat bands surrounded by exceptional rings, formed at Dirac points of plasmonic lattice resonances. The reported spin polarization differs from previously reported chiral and pseudochiral phenomena in that it solely ...

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WebDec 13, 2024 · Chiral exceptional points in metasurfaces. M. Kang, J. Chen, Y. Chong; Physics. 2016; An exceptional point (EP) is a degeneracy occurring in a non-energy-conserving system, in which two eigenvectors of a non-Hermitian Hamiltonian coalesce. We explore how EPs can be realized in a ... WebApr 12, 2024 · In optical systems, one kind of exceptional point (EP) is associated with the maximally unidirectional reflection. Here, we theoretically show that the intrinsic …

WebJan 29, 2024 · In this work, for the first time to the best of our knowledge, we address this challenge by designing novel chiral BIC metasurfaces with integrated-resonance units (IRUs) [] supporting quasi-BICs resonances with both high-Q and strong CD in mid-infrared regimes. Specifically, our metasurfaces consist of a 2D twisted vertical split-ring … WebJun 4, 2024 · This extraordinary chiroptical response is achieved through band folding that enables coupling of incident light to spin-polarized flat bands surrounded by exceptional …

WebJan 18, 2024 · In conclusion, we have presented, to our knowledge, the first experimental observation of optical chiral BICs enabling simultaneously high values of the Q -factor ( Q = 2663) and a near-unity CD ... WebApr 12, 2024 · Chiral exceptional points in metasurfaces. M. Kang, J. Chen, Y. Chong. Physics. 2016. An exceptional point (EP) is a degeneracy occurring in a non-energy …

WebExceptional points are special points in non-Hermitian systems, and there are many novel physical phenomena in the parameter space near the exceptional points. In recent years, metasurface has been a popular topic in physics. A large number of devices with superior performance have been designed based on metasurface platform. The appearance of …

WebMay 11, 2024 · In particular, the dynamical encirclement of exceptional points (EPs) in parameter space has been shown to lead to a chiral phase accumulation, non-adiabatic jumps and topological mode conversion ... porcher e905601WebApr 6, 2024 · Here, we propose an electrical and spectral way of resolving chiral EPs and clarifying the consequences of chiral mode collapsing of a non-Hermitian gated … porcher d2490aaWebKang, M., Chen, J., & Chong, Y. D. (2016). Chiral exceptional points in metasurfaces. Physical Review A, 94(3). doi:10.1103/physreva.94.033834 sharon underwood spokaneWebJan 4, 2024 · The term “exceptional point” was first introduced in studying the perturbation of linear non-Hermitian operators ( 6 ), described by a general class of matrices H ( z) parameterized by the complex variable z = x + i y, where x is the real part, i is the imaginary unit, and y is the imaginary part. porcher eclose badiniereWebAug 23, 2024 · Non-Hermitian degeneracies, also known as exceptional points (EPs), have been the focus of much attention due to their singular eigenvalue surface structure. Nevertheless, as pertaining to a non-Hermitian metasurface platform, the reduction of an eigenspace dimensionality at the EP has been investigated mostly in a passive repetitive … porcheret bernardWebAbstract. We investigate the exceptional points (EPs) in chiral metasurfaces composed of periodic arrays of two orthogonally orientated graphene strips in the terahertz … porcher grab barsWebAug 3, 2024 · 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 … porche retractil