Chiral exceptional points in metasurfaces
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 … WebNon-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 manner.
Chiral exceptional points in metasurfaces
Did you know?
WebMay 13, 2024 · This study proposes an approach to generate high-order exceptional points (EPs) in non-Hermitian systems. A system comprising a homogenous waveguide is considered wherein the imaginary part of the refractive index is modulated using a one-dimensional Moiré profile. This gain-loss modulation couples different lossless … 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 …
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 … 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 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 ...
http://www.alulab.org/journal%20papers.htm
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 … phenomenology titleWebJan 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 … phenomenology the basicsWebApr 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 … phenomenology topic examplesWebJun 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 ... phenomenology title examplesWebApr 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 … phenomenology topicsWebDouble exceptional points in grating coupled metal-insulator-metal heterostructure. ... [Suppl. Mat. (1)] Giant photonic spin Hall effect in bilayer borophene metasurfaces. Min Cheng, Ping Fu, and Shengyu Chen. Opt. Express 30(22 ... ITO/Si/ITO semi-cone-shell chiral complexes on silicon nanocones with broadband circular dichroism in the mid ... phenomenology timeWebAug 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 … phenomenology versus grounded theory