Abstract Deep learning has become the dominant approach in artificial intelligence to solve complex data-driven problems. Originally applied almost exclusively computer-science areas such as image analysis and nature language processing, deep rapidly entered a wide variety of scientific fields including physics, chemistry material science. Very recently, neural networks have been introduced field nanophotonics powerful way obtaining nonlinear mapping between topology composition arbitrary...

We investigate the interplay between quenching and strong coupling in systems that include a collection of quantum emitters interacting with metal nanoparticle. By using detailed numerical simulations analytical modeling, we demonstrate can exhibit particle dipole resonance at distances which to nonradiative channels is expected dominate dynamics. These results be accounted for terms pseudomode character higher multipole modes nanoparticle corresponding reduction induced loss rate. findings...

The crystal symmetry in materials such as GaAs can enable quasi-phasematching for efficient optical frequency conversion without poling, twinning or other engineered domain inversions. means that a 90° rotation is equivalent to crystallographic inversion. Therefore, when light circulates about the axis, whispering-gallery-mode microdisks, it encounters effective inversions produce quasi-phasematching. Microdisk resonators also offer resonant field enhancement, resulting highly...

We explore, both experimentally and theoretically, the existence in millimeter-wave range of phenomenon extraordinary light transmission through arrays subwavelength holes. have measured spectra several samples made on aluminum wafers by use an AB Millimetre quasi-optical vector network analyzer wavelength 4.2–6.5 mm. Clear signals resonant at wavelengths close to period array appear spectra.

<a href="http://oe.osa.org/virtual_issue.cfm?vid=36">Focus Serial: Frontiers of Nonlinear Optics</a> photonic-crystal microresonators offer unique fundamental ways enhancing a variety nonlinear optical processes. This enhancement improves the performance devices to such an extent that their corresponding operation powers and switching times are suitable for implementation in realistic ultrafast integrated devices. Here, we review three different phenomena can be strongly enhanced photonic...

Abstract Nonlinear propagation of light in a graphene monolayer is studied theoretically. It shown how the large intrinsic nonlinearity at optical frequencies enables formation quasi one‐dimensional self‐guided beams (spatial solitons) featuring subwavelength widths moderate electric‐field peak intensities. A novel class nonlinear self‐confined modes resulting from hybridization surface plasmon polaritons with solitons also demonstrated.

In this work we explore the transmission properties of a single slit in metallic screen. We analyze dependence these on both width and angle incident radiation. study detail crossover between subwavelength regime geometrical-optics limit. regime, resonant linked to excitation waveguide resonances is analyzed. Linewidth their associated electric-field intensities are controlled by just slit. More complex spectra appear when wavelength light comparable width. Rapid oscillations with emergence...

In this Letter we show that the extraordinary optical transmission phenomenon found before in 2D hole arrays is already present a linear chain of subwavelength holes, which can be considered as basic geometrical unit showing property. order to study problem, have developed new theoretical framework, able analyze properties finite collections apertures and/or dimples (of any shape and placed arbitrary positions) drilled metallic film.

We present a theoretical analysis of lasing action in photonic crystal surface-emitting lasers (PCSELs).The semiclassical laser equations for such structures are simulated with three different techniques: exact finite-difference time-domain calculations, an steady-state ab-initio theory and semi-analytical coupled-mode formalism.Our simulations show that, exemplary four-level gain model, the excitation dark Fano resonances featuring arbitrarily large quality factors can lead to significant...

In this Letter we introduce a novel route for achieving negative-group-velocity waveguiding at deep-subwavelength scales. Our scheme is based on the strong electromagnetic coupling between two conformal surface plasmon structures. Using symmetry arguments and detailed numerical simulations, show that coupled system can be geometrically tailored to yield negative-index dispersion. A high degree of subwavelength modal confinement, λ/10 in transversal dimensions, also demonstrated. These...

We theoretically study the emergence of strong coupling in interaction between quantum emitters and localized surface plasmons a metal nanoparticle. Owing to their quasidegenerate nature, continuum multi-poles is shown behave as pseudomode strongly coupled single instead Markovian bath. demonstrate that corresponding capping induced loss rate enables collective dipole mode. Numerical simulations analytical modeling are applied several configurations increasing complexity grasp relevant...

In this work we use multiple scattering in conjunction with a genetic algorithm to reliably determine the optimized photonic-crystal-based structure able perform specific optical task. The operates on population of candidate structures produce new candidates better performance an iterative process. potential approach is illustrated by designing spot size converter that has very low F-number (F=0.47) and conversion ratio 11:1. Also, have designed coupler device introduces light from fiber...

In this paper, we show that the phenomenon of extraordinary transmission through arrays subwavelength holes, present in optical regime, is also millimeter wave range. After presentation theoretical foundations enhanced transmission, measurements response have been performed on different samples by using a quasioptical vector network analyzer range between 45 and 110 GHz. The prototypes fabricated Aluminum plates with several thickness hole diameters drilled laser machine. Good agreement...

We investigate transmission efficiency and finite size effects for the subwavelength hole arrays. Experiments simulations show how depend strongly on diameter. The reaches an asymptotic upper value when array is larger than surface plasmon propagation length corrugated surface. By comparing of arrays with that corresponding single holes, relative enhancement found to increase as diameter decreases. In conditions experiments one two orders magnitude but there no fundamental limit this value.

Many of graphene's unique electronic properties emerge from its Dirac-like energy spectrum. Similarly, it is expected that a nanophotonic system featuring Dirac dispersion (two conical bands touching at single point, the so-called point) will open path to number important research avenues. To date, however, all proposed realizations photonic analog graphene lack fully omnidirectional out-of-plane light confinement, which has prevented creating truly realistic implementations this class...

Long-range coherent interactions between quantum emitters are instrumental for information and simulation technologies, but they generally difficult to isolate from dissipation. Here, we show how such can be obtained in photonic Weyl environments due the emergence of an exotic bound state whose wave function displays power-law spatial confinement. Using exact formalism, this mediate transfer excitations emitters, with virtually no dissipation a rate that follows same scaling distance as...

Deep learning is having a tremendous impact in many areas of computer science and engineering. Motivated by this success, deep neural networks are attracting increasing attention other disciplines, including the physical sciences. In work, we show that artificial can be successfully used theoretical modeling analysis variety radiative-heat-transfer phenomena devices. By using set custom-designed numerical methods able to efficiently generate required training data sets, demonstrate approach...

By using a theoretical formalism able to work in both real and $k$ spaces, the physical origin of phenomenon extraordinary transmission light through quasiperiodic arrays holes is revealed. Long-range order present array selects wave vector(s) surface electromagnetic mode(s) that allows an efficient subwavelength holes.

Solid-state lasers constitute essential tools in a variety of scientific and technological areas, being available many different designs. However, although nanolasing has been successfully achieved for dyes semiconductor gain media associated with plasmonic structures, the operation solid-state beyond diffraction limit not reported yet. Here, we demonstrate room temperature laser action subwavelength confinement Nd(3+)-based by means localized surface plasmon resonances supported chains...

By altering the lattice geometry of photonic crystal surface-emitting lasers (PCSELs), we tune regular lasing band edges quadratic dispersions to form a single accidental Dirac point linear dispersion at Brillouin zone center. This not only increases mode spacing by orders magnitude, but also eliminates distributed in-plane feedback enable single-mode PCSELs substantially larger area thus higher output power. The advantages using cones are systematically evaluated through two-dimensional...

We show that Weyl points can be realized in all-dielectric superlattices based on three-dimensional (3D) layered photonic crystals. Our approach is creating an inversion-breaking array of weakly-coupled planar defects embedded a periodic structure with large omnidirectional band gap. Using detailed calculations and tight-binding theory arguments, we demonstrate this class systems tailored to display 3D linear point degeneracies between two bands, without breaking time-reversal symmetry using...

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> In this paper, we review various numerical methods currently used to model nonlinear optical processes in nanophotonics. Among the different theoretical frameworks that have been study photonic structures, particularly focus on application of both perturbation theory and coupled-mode analysis complex nanophotonic devices. This description is illustrated several examples how these techniques can...

The fast decay of carrier inversion in photoexcited graphene has been attributed to optical phonon emission and Auger recombination. Plasmon provides another pathway that, as we show here, drives the relaxation dynamics on ultrafast time scales. In studying nonequilibrium find that plasmon effectively converts into hot carriers, whose energy is then extracted by emission. This mechanism not only explains observed femtosecond lifetime but also offers prospect for atomically thin emitters.