Recent theoretical studies of Stimulated Brillouin Scattering (SBS) in nanoscale devices have led to an intense research effort dedicated the demonstration and application this nonlinearity on-chip systems. The key feature SBS integrated photonic waveguides is that small, high-contrast are predicted experience powerful optical forces on waveguide boundaries, which further boost gain already expected grow dramatically such structures because higher mode confinement alone. In all recent...

We theoretically explore the role of mesoscopic fluctuations and noise on spectral temporal properties systems $\mathcal{PT}$-symmetric coupled gain-loss resonators operating near exceptional point, where eigenvalues eigenvectors coalesce. show that inevitable detuning in frequencies uncoupled leads to an unavoidable modification conditions for reaching while, as this point is approached ensembles resonator pairs, statistical averaging significantly smears features. also discuss how these...

Abstract Lithium niobate (LN) has been the material of choice for electro-optic modulators owing to its excellent physical properties. While conventional LN continue be workhorse modern optoelectronics, they are becoming progressively too bulky, expensive, and power-hungry fully serve needs this industry. Here, we demonstrate plasmonic directional coupler switches consisting two closely spaced nm-thin gold nanostripes on substrates that guide both coupled electromagnetic modes electrical...

Rooted in quantum optics and benefiting from its well-established foundations, strong coupling nanophotonics has experienced increasing popularity recent years. With being an experiment-driven field, the absence of appropriate theoretical methods to describe ground-breaking advances often emerged as important issue. To address this problem, temptation directly transfer extend concepts already available is strong, even if a rigorous justification not always available. In review we discuss...

Brillouin scattering is an important and interesting nonlinear effect involving the interaction between optical acoustic fields in waveguides. It increasingly useful field of photonics, where it supplies a tunable ultra-narrow linewidth response that can be used for applications including sensing, filtering, lasing, as well storage pulses. This tutorial gives overview fundamentals aimed at newcomers to field, covers physics underlying interaction, mathematical theory, setup details...

Since the very first proposition of photonic crystals, their influence on dynamics spontaneous emission has been great interest. The radiation is described by an integration kernel which--in a spectral representation--comprises two equally important contributions: Lamb shift and radiative contribution to linewidth. latter connected density states via Fermi's golden rule. To our knowledge, we present spatially resolved measurement complete in crystal its local over wide range. this end study...

Their intrinsic properties render single quantum systems as ideal tools for enhanced sensing and microscopy. As an additional benefit, their size is typically on atomic scale that enables with very high spatial resolution. Here, we report utilizing a nitrogen vacancy center in nanodiamond performing three-dimensional scanning-probe fluorescence lifetime imaging By measuring changes of the emitter's lifetime, information local density optical states acquired at nanoscale. Three-dimensional ab...

On-chip manipulating and controlling the temporal spatial evolution of light is crucial importance for information processing in future planar integrated nanophotonics. The spin orbital angular momentum light, which can be treated independently classical macroscopic geometrical optics, appear to coupled on subwavelength scales. We use spin-orbit interactions a plasmonic achiral nano-coupler unidirectionally excite surface plasmon polariton modes propagating seamlessly slot waveguides....

Historically, the field of plasmonics has been relying on framework classical electrodynamics, with local-response approximation material response being applied even when dealing nanoscale metallic structures. However, confinement electromagnetic radiation approaches atomic scales, mesoscopic effects are anticipated to become observable, e.g., those associated nonlocal electrodynamic surface electron gas. Here, we investigate in propagating gap plasmon modes ultrathin metal-dielectric-metal...

Lithium niobate Mach–Zehnder modulators (MZMs) are present in a wide range of technologies and though fulfilling the performance reliability requirements applications, they becoming progressively too bulky, power inefficient, slow switching to keep pace with future technological demands. Here, we utilize plasmonics demonstrate most efficient (VπL = 0.23 Vcm) lithium MZM date, consisting gold nanostripes on that guide both plasmonic modes electrical signals control their relative optical...

We present an analytic, Mie theory-based solution for the energy loss and photon-emission probabilities in interaction of spherical nanoparticles with electrons passing nearby through them, both cathodoluminescence electron energy-loss spectroscopies. In particular, we focus on case penetrating trajectories, which complete fully electrodynamic relativistic formalism has not been reported as yet. exhibit efficiency this method describing collective excitations matter calculations a dispersive...

By using direct laser writing into a novel commercially available photoresist and silicon-double-inversion procedure followed by tempering of the silicon structures, we realize high-quality centered-tetragonal woodpile photonic crystals with complete bandgaps near 1.55 μm wavelength. The 6.9% gap-to-midgap ratio bandgap is evidenced comparison measured transmittance reflectance spectra band-structure scattering-matrix calculations.

We theoretically analyze the hybrid Mie-exciton optical modes arising from strong coupling of excitons in organic dyes or transition-metal dichalcogenides with Mie resonances high-index dielectric nanoparticles. Detailed analytic calculations show that silicon core-exciton shell nanoparticles are characterized by a richness modes, which can be tuned through nanoparticle dimensions to produce large anticrossings visible near infrared, comparable those obtained plexcitonics. The complex...

Acoustic waves can serve as memory for optical information; however, propagating acoustic phonons in the gigahertz (GHz) regime decay on nanosecond time scale. Usually this is dominated by intrinsic loss due to inelastic scattering of and thermal phonons. Here we show a way counteract waveguide resonantly reinforcing wave via synchronized pulses. We experimentally demonstrate coherent on-chip storage amplitude phase up 40 ns, 4 times lifetime waveguide. Through theoretical considerations,...

Surface-response functions are one of the most promising routes for bridging gap between fully quantum-mechanical calculations and phenomenological models in quantum nanoplasmonics. Within all currently available recipes obtaining such response functions, \emph{ab initio} remain predominant, wherein surface-response function retrieved via metal's non-equilibrium to an external perturbation. Here, we present a complementary approach where appealing namely Feibelman $d$-parameters, yield...

Coherent control of traveling acoustic excitations in a waveguide system is an interesting way to manipulate and transduce classical quantum information. So far, these interactions, often based on optomechanical resonators or Brillouin scattering, have been studied the steady-state regime using continuous waves. However, experiments are optical pump pulses, which require treatment dynamic framework. In this paper, we present effective Hamiltonian formalism pulses that links optomechanics...

Abstract We discuss the possibility of self-hybridisation in high-index dielectric nanoparticles, where Mie modes electric or magnetic type can couple to interband transitions material, leading spectral anticrossings. Starting with an idealised system described by moderately high constant permittivity a narrow Lorentzian, which is visible for both plane-wave and electron-beam excitation, we embark on quest realistic systems this effect should be visible. explore variety spherical particles...

We study the impact of structural variations (that is slowly varying geometry aberrations and internal strain fields) on width shape stimulated Brillouin scattering (SBS) resonance in nanoscale waveguides. find that they lead to an homogeneous broadening through two distinct mechanisms: firstly, acoustic frequency directly influenced via mechanical nonlinearities; secondly, optical wave numbers are opto-mechanical nonlinearity leading additional shift phase-matching condition. this second...

The recent generalised nonlocal optical response (GNOR) theory for plasmonics is analysed, and its main input parameter, namely the complex hydrodynamic convection-diffusion constant, quantified in terms of enhanced Landau damping due to diffusive surface scattering electrons at metal. GNOR has been successful describing plasmon effects, addition frequency shifts originating from induced-charge screening, through a phenomenological electron diffusion term implemented into traditional Drude...

Optical nonreciprocity, which breaks the symmetry between forward and backward propagating optical waves, has become vital in photonic systems enables many key applications. So far, all existing nonreciprocal are implemented for linearly or randomly polarized fundamental modes. vortex modes, with wavefronts that spiral around central axis of propagation, have been extensively studied over past decades offer an additional degree freedom useful Here, we report a light-driven isolation system...

In a theoretical design study, we propose buried waveguides made of germanium or alloys and other group-IV elements as CMOS-compatible platform for robust, high-gain stimulated Brillouin scattering (SBS) applications in the mid-infrared regime. To this end, present numerical calculations backward-SBS at 4 μm that are silicon nitride. Due to strong photoelastic anisotropy germanium, investigate two different orientations crystal with respect waveguide's propagation direction find considerable...

Inelastic scattering processes such as Brillouin can often function in cascaded regimes and this is likely to occur certain integrated opto-acoustic devices. We develop a Hamiltonian formalism for valid both quantum classical regimes. By regarding the interaction of single acoustic envelope optical that covers all Stokes anti-Stokes orders, we obtain compact model well suited numerical implementation, extension include other nonlinearities or short pulses, application quantum-optics domain....

A detailed computational study of the wavelength-dependent efficiency optical second-harmonic generation in plasmonic nanostructures is presented. The computations are based on a discontinuous Galerkin Maxwell solver that utilizes hydrodynamic material model to calculate free-electron dynamics metals without any further approximations. Besides wave-mixing effects, thus contains full nonlocal characteristics electromagnetic response, as well intensity-dependent phenomena such Kerr effect. To...

We study the impact of two-photon absorption (2PA) and fifth-order nonlinear loss such as 2PA-induced free-carrier in semiconductors on performance Stimulated Brillouin Scattering devices. formulate equations motion including effective coefficients, whose explicit expressions are provided for numerical evaluation any waveguide geometry. find that 2PA results a monotonic, algebraic relationship between amplification, length pump power, whereas losses lead to non-monotonic relationship. define...