Plasmon resonances play a pivotal role in enhancing light-matter interactions nanophotonics, but their low-quality factors have hindered applications demanding high spectral selectivity. Here, we demonstrate the design and 3D laser nanoprinting of plasmonic nanofin metasurfaces, which support symmetry-protected bound states continuum up to fourth order. By breaking nanofins’ out-of-plane symmetry parameter space, achieve high-quality factor (up 180) modes under normal incidence. The can be...

Photonic bound states in the continuum (BICs) provide a standout platform for strong light-matter coupling with transition metal dichalcogenides (TMDCs) but have so far mostly been implemented as traditional all-dielectric metasurfaces adjacent TMDC layers, incurring limitations related to strain, mode overlap and material integration. Here, we demonstrate intrinsic BIC-driven composed of nanostructured bulk tungsten disulfide (WS2) exhibiting resonances sharp, tailored linewidths selective...

Abstract To control and enhance light–matter interactions at the nanoscale, two parameters are central: spectral overlap between an optical cavity mode material’s features (for example, excitonic or molecular absorption lines), quality factor of cavity. Controlling both simultaneously would enable investigation systems with complex features, such as multicomponent mixtures heterogeneous solid-state materials. So far, it has been possible only to sample a limited set data points within this...

Abstract All-dielectric metasurfaces supporting photonic bound states in the continuum (BICs) are an exciting toolkit for achieving resonances with ultranarrow linewidths. However, transition from theory to experimental realization can significantly reduce optical performance of BIC-based nanophotonic systems, severely limiting their application potential. Here, we introduce a combined numerical/experimental methodology predicting how unavoidable tolerances nanofabrication such as random...

Broken symmetries lie at the heart of nontrivial physical phenomena. Breaking in-plane geometrical symmetry optical systems allows to access a set electromagnetic states termed symmetry-protected quasi-bound in continuum (qBICs). Here we demonstrate, theoretically, numerically and experimentally, that such can also be accessed metasurfaces by breaking permittivity comprising materials, showing remarkable equivalence their geometrically-asymmetric counterparts. However, while size atoms...

Abstract Semiconductor‐based surface‐enhanced Raman spectroscopy (SERS) substrates, as a new frontier in the field of SERS, are hindered by their poor electromagnetic confinement and weak light‐matter interaction. Metasurfaces, class 2D artificial materials based on design nanophotonic resonators, enable strong enhancement optical absorption engineering for wide range semiconductors. However, semiconductor substrates into metasurfaces improving SERS activity remains underexplored. Here, an...

Photocatalytic platforms based on ultrathin reactive materials facilitate carrier transport and extraction but are typically restricted to a narrow set of spectral operating ranges due limited absorption poor energy-tuning possibilities. Metasurfaces, class 2D artificial the electromagnetic design nanophotonic resonators, allow optical engineering for wide range materials. Moreover, tailored resonances in nanostructured enable strong enhancement thus multiplication. Here, we develop an...

Nanophotonic devices excel at confining light into intense hot spots of electromagnetic near fields, creating exceptional opportunities for light–matter coupling and surface-enhanced sensing. Recently, all-dielectric metasurfaces with ultrasharp resonances enabled by photonic bound states in the continuum (BICs) have unlocked additional functionalities biospectroscopy precisely targeting reading out molecular absorption signatures diverse systems. However, BIC-driven spectroscopy has so far...

All-dielectric optical metasurfaces with high quality (Q) factors have been hampered by the lack of simultaneously lossless and high-refractive-index materials over full visible spectrum. In fact, use low-refractive-index is unavoidable for extending spectral coverage due to inverse correlation between bandgap energy (and therefore losses) refractive index (n). However, Mie resonant photonics, smaller indices are associated reduced Q low mode volume confinement. Here, symmetry-broken quasi...

Active metasurfaces, compact platforms for nanoscale light manipulation, are transforming technologies like holography, quantum cryptography, and optical computing. Despite their versatility, tunability in metasurfaces has mainly relied on shifting the resonance wavelength or increasing material losses to spectrally detune quench resonant modes, respectively. However, both methods face fundamental limitations, such as limited Q-factor near-field enhancement control inability achieve on/off...

Abstract It had been previously shown that an idealized version of the two‐wave‐vector extension NMR pulsed‐field‐gradient spin echo diffusion experiment can be used to determine apparent radius geometries with restricted diffusion. In present work, feasibility was demonstrated in imaging experiment, which axons white matter tissue determined. Moreover, numerical simulations have carried out reliability results. For small times, is systematically underestimated. Larger gradient area, finite...

A method describing NMR-signal formation in inhomogeneous tissue is presented which covers all diffusion regimes. For this purpose, the frequency distribution inside voxel described. Generalizing results of well-known static dephasing regime, we derive a formalism to describe that valid over whole dynamic range. The expressions obtained are agreement with from Kubos line-shape theory. To examine effects, utilize strong collision approximation, replaces original process by simpler stochastic...

The technological requirements of low-power and high-fidelity color displays have been instrumental in driving research into advanced coloration technologies. At the forefront these developments is implementation dye-free approaches, which overcome previous constraints related to resolution fading. Resonant dielectric nanostructures emerged as a promising paradigm, showing great potential for high efficiency, saturation, wide gamut palette, image reproduction. However, they still face...

We consider the trajectories of particles suspended in a randomly moving fluid. If Lyapunov exponent these is negative, paths coalesce, so that aggregate. Here we give detailed account method [B. Mehlig and M. Wilkinson, Phys. Rev. Lett. 92, 250602 (2004)] for calculating this exponent: it expressed as expectation value random variable evolving under stochastic differential equation. analyze equation detail limit where correlation time velocity field fluid very short, such Langevin derive an...

Scattering-type scanning near-field optical microscopy (s-SNOM) is one of the predominant techniques for nanoscale characterization properties. The response nanoantennas in s-SNOM highly sensitive to their environment, including influences probing tip or neighboring resonators. Dielectric tips are commonly employed minimize tip-related perturbations, although they provide a comparatively weak scattering signal. Here we show that when using metallic tips, it possible select between distinct...

Orbital angular momentum (OAM) of light represents an independent degree freedom using orthogonal helical modes for optical and quantum multiplexing, offering great potential to transform future ultrahigh-bandwidth information systems. Practical OAM communication systems suffer from turbulence-induced phase distortions the propagating beams, decreasing orthogonality through introduced modal crosstalk. To date, used measuring breakdown in different turbulence conditions are too bulky slow...

Dielectric metasurfaces supporting quasi-bound states in the continuum (qBICs) enable high field enhancement with narrow-linewidth resonances visible and near-infrared ranges. The resonance emerges when distorting meta-atom's geometry away from a symmetry-protected BIC condition and, usually, given design can sustain one or two of these states. In this work, we introduce silicon-on-silica metasurface that simultaneously supports up to four qBIC region. This is achieved by combining multiple...