Chiral exceptional points in metasurfaces
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 … 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 …
Chiral exceptional points in metasurfaces
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WebNov 3, 2024 · 2024. TLDR. It is shown that controlling the absorption of a coupled microresonator system can produce a new kind of absorbing exceptional point, and how these exceptional points are distinct and how systems can be engineered to exhibit new scattering behavior. 62. PDF. WebJan 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.
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 … 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.
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 … 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 …
WebApr 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 …
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 … dassault systemes net worthWebExceptional 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 … dassault systemes new yorkWebWe experimentally demonstrate an electrical and spectral way of accessing the chiral EPs with non-Hermitian gate-controlled graphene metasurfaces. This work reveals the EP … dassault systemes software无法卸载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 … dassanech ethiopiaWebJun 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 … dassault mirage f1 specificationsWebSep 13, 2024 · Here, we report on the experimental realization of true/intrinsic chiral response with resonant metasurfaces where the engineered slant geometry breaks both … bitewing comicWebApr 3, 2024 · The proposed embedded chiral metasurfaces have different modes under different observation conditions, such as those illustrated in Figure 3a,b. Figure 3 a has a vibrant structural color covering the full-color gamut in Figure 3 c under cross-polarization conditions with different periods from 220 nm to 400 nm, which we call the color mode. bitewing example