We show strong coupling involving three different types of resonances in plasmonic nanoarrays: surface lattice (SLRs), localized plasmon on single nanoparticles, and excitations organic dye molecules. The measured transmission spectra splittings that depend the molecule concentration. results are analyzed using finite-difference time-domain simulations, a coupled-dipole approximation, coupled-modes models, Fano theory. delocalized nature collective SLR modes suggests regime molecules near...

Abstract Lasing at the nanometre scale promises strong light-matter interactions and ultrafast operation. Plasmonic resonances supported by metallic nanoparticles have extremely small mode volumes high field enhancements, making them an ideal platform for studying nanoscale lasing. At visible frequencies, however, applicability of plasmon is limited due to ohmic radiative losses. Intriguingly, plasmonic nanoparticle arrays support non-radiative dark modes that offer longer life-times but are...

We study spatial coherence properties of a system composed periodic silver nanoparticle arrays covered with fluorescent organic molecule (DiD) film. The evolution this composite structure from the weak to strong coupling regime is investigated by systematically varying strength between localized DiD excitons and collective, delocalized modes array known as surface lattice resonances. A gradual observed, features clearly visible in interference fringes. high degree demonstrated regime, even...

The right-handed twist along aqueous dispersed cellulose nanocrystals allows chiral plasmonics upon electrostatic binding of gold nanoparticles in dilute environment, through tuning the particle sizes and concentrations. Simulations using nanoparticle coordinates from cryo-electron tomography confirm experimental results. finding suggests generalization for other helical colloidal templates nanoscale plasmonics.

Abstract Recently, optical bound states in continuum (BICs) incorporated with gain have been reported to exhibit lasing. Here, it is shown that each of the four BICs supported by C symmetric photonic crystal slab can be made lase, allowing control over topological charge resulting laser beam. The type BIC and their charges are identified imaging far‐field polarization vortices lasing signal. Results compared experimentally obtained dispersions, finite element method simulations, multipole...

Material properties depend critically on the packing and order of constituent units throughout length scales. Beyond classically explored molecular self-assembly, structure formation in nanoparticle colloidal scales have recently been actively for new functions. Structure assemblies depends strongly assembly process, higher structural control can be reliably achieved only if process is deterministic. Here we show that self-assembly cationic spherical metal nanoparticles anionic rod-like...

Abstract Light-induced surface structuring of azobenzene-containing films allows for creation complex relief patterns with varying heights, which would be difficult to create using conventional lithography tools. In order realize the full potential these patternable surfaces, understanding their formation dynamics and response different types light fields is crucial. present work we introduce digital holographic microscopy (DHM) real time, in-situ observation surface-relief grating (SRG) on...

We demonstrate a simple and scalable approach to increase conversion efficiencies of nonlinear metasurfaces by incorporating them into multipass cells letting the pump beam interact with multiple times. experimentally show that metasurface design, associated phase-matching criteria can be fulfilled. As proof principle, we achieve phase matching second-harmonic generation (SHG) using consisting aluminum nanoparticles deposited on glass substrate. The condition is verified achieved measuring...

We report on lasing at visible wavelengths in arrays of ferromagnetic Ni nanodisks overlaid with an organic gain medium. demonstrate that by placing material within the mode volume plasmonic nanoparticles both radiative and, particular, high ohmic losses nanodisk resonances can be compensated. Under increasing pump fluence, systems exhibit a transition from lattice-modified spontaneous emission to lasing, latter being characterized highly directional and sub-nanometer line width emission. By...

Nonlinear metamaterials show potential for realizing flat nonlinear optical devices but are generally lacking in terms of achievable conversion efficiencies. Recent work has focused on enhancing processes by utilizing high quality factor resonances, such as collective responses known surface lattice resonances (SLRs) taking place periodic metal nanoparticle arrays. Here, we investigate how the dispersive nature SLRs affects SLR-supporting metasurfaces. Particularly, measure second-harmonic...

Plasmonic metasurfaces exhibiting collective responses known as surface lattice resonances (SLRs) show potential for realizing flat photonic components wavelength-selective processes, including lasing and optical nonlinearities. However, postfabrication tuning of SLRs remains challenging, limiting the applicability SLR-based components. Here, we demonstrate how properties high quality factor are easily modified by breaking symmetry nanoparticle surroundings. We break changing refractive...

Controlling and generating coherent light fields in the nanoscale is critical for reducing size of photonic circuitry. There are several demonstrations zero-, one-, two-, three-dimensional nanolaser architectures. Here we experimentally demonstrate a one-dimensional plasmonic laser, which consists periodic chain aluminum nanoparticles organic gain media. Lasing observed at visible wavelengths, with clear thresholds line widths down to 0.11 nm. occurs dark mode that extends over whole...

Directing the assembly of plasmonic nanoparticles into chiral superstructures has diverse applications including, chiroptical sensing, nonlinear optics, and biomedicine. Though soft template-mediated assemblies both spherical nonspherical gold have made significant progress, most approaches require sophisticated chemical synthesis or advanced methodologies. Besides, reports structurally precise beyond nanoscale are limited. Here, we propose an efficient yet simple strategy to grow such...

We propose a novel approach for lensless single-shot phase retrieval, which provides pixel super-resolution imaging. The is based on computational separation of carrying and object wavefronts. imaging task to reconstruct the wavefront, while wavefront corrects discrepancies between model physical elements an optical system. To we do two preliminary tests as system calibration without object. Essential retrieval noise suppressed by combination sparse- deep learning-based filters. Robustness...

Abstract Diffractive optical elements (DOE) are integral components for lightweight and ultra‐thin due to their ability manipulate light efficiently accurately. However, conventional DOEs static cannot be altered after fabrication, which hinders adaptability changing requirements. To overcome this limitation, the potential of surface patterning on azobenzene thin films fabricate reconfigurable is investigated. Using holographic lithography, topographies with sinusoidal relief gratings (SRG)...

In this contribution, we report a supramolecular approach toward mesogens showing aggregation-induced emission (AIE). AIE-active aromatic thioethers, acting as hydrogen-bond donors, were combined with alkoxystilbazoles acceptors. Upon self-assembly, hydrogen-bonded complexes monotropic liquid crystalline behavior obtained. addition, it was found that the introduction of chiral citronellyl side chain leads to drastic bathochromic shift emission, which not observed for linear alkyl chains. The...

We report on reversible all-optical emission control and lasing in plasmonic nanoparticle lattices. By incorporating photochromic molecules into the liquid gain medium composed of organic fluorescent molecules, we realize over absorption, two key parameters associated with both conventional nanoscale lasing. demonstrate photoswitching between distinct modes operation: (1) spontaneous to lattice mode, characterized by broad line width, low intensity, large angular distribution; (2) action,...

Thin-film organic distributed feedback (DFB) lasers processed with elastomeric polymers allow fabrication of flexible and continuously tunable coherent light sources. So far, the realized laser devices fall short on broad continuous tuning range. We demonstrate that addition plasticizers to polymer matrix minimization thickness can reduce mechanical impact and, thus, extend wavelength range full gain active medium. A contact-transfer method is used transfer gently ultra-thin membrane DFB a...

The unique properties of surface plasmon polaritons, such as strong field confinement and local enhancement effects, make them ideal candidates to enhance shape the emission luminescent nanoparticles. Of these nanoparticles, quantum dots are highly versatile, suitable for vastly different applications due their size material tunability. In many cases however, wavelength is fixed after manufacturing, allowing no control over in situ properties. Here, we show fully optical, tunability dots,...

Abstract Lasing at the nanoscale using plasmonic nanoparticles offers prospect of strong field concentration, hence light−matter interactions, low lasing thresholds, and ultrafast operation. However suffer from high dissipative radiative losses, latter being rigidly tied to shape symmetry their localized plasmon resonant modes. To overcome this limitation, recent theoretical work proposes direct into dark surface states construct lasers that conceptually allow for independent implementation...

We study lasing in arrays of metallic nanoparticles combined with an active medium dye molecules. use a model which reduces the generally complicated spatial and temporal dynamics electromagnetic fields array structure to single ordinary differential equation for oscillating dipole. By focusing on most relevant processes, this approximation allows direct physical insight while reducing computational effort. benchmark our against recent experiments find satisfactory agreement.

The paper presents a novel and fast method to characterize thin film conformality on microscopic 3D High Aspect Ratio substrates. deposition experiment uses specially designed PillarHall(TM) Lateral (LHAR) silicon chip as substrate. measurement relies the conventional planar surface characterization tools such optical microscopy, line-scan reflectometry ellipsometry. results show that is accurate way well other properties, also in wafer-level.