We develop a general theory of spatial solitons in liquid crystalline medium exhibiting nonlinearity with an arbitrary degree effective nonlocality. The model accounts the observability accessible and establishes important link parametric solitons.

We report on the observation and quantitative assessment of self-trapped pulsating beams in a highly nonlocal nonlinear regime. The experiments were conducted nematic liquid crystals allow meaningful comparison with prediction scalar theory perturbative limit, while addressing need for beyond-paraxial analytical treatments.

Spiral twisting offers additional opportunities for controlling the loss, dispersion, and polarization state of light in optical fibers with noncircular guiding cores. Here, we report an effect that appears continuously twisted photonic crystal fiber. Guided by helical lattice hollow channels, cladding is forced to follow a spiral path. This diverts fraction axial momentum flow into azimuthal direction, leading formation discrete orbital angular states at wavelengths scale linearly twist...

Quantum and classical physics can be used for mathematical computations that are hard to tackle by conventional electronics. Very recently, optical Ising machines have been demonstrated computing the minima of spin Hamiltonians, paving way new ultrafast hardware machine learning. However, proposed systems either tricky scale or involve a limited number spins. We design experimentally demonstrate large-scale based on simple setup with spatial light modulator. By encoding variables in binary...

Spin-glass theory is one of the leading paradigms complex physics and describes condensed matter, neural networks biological systems, ultracold atoms, random photonics many other research fields. According to this theory, identical systems under conditions may reach different states. This effect known as replica symmetry breaking revealed by shape probability distribution function an order parameter named Parisi overlap. However, a direct experimental evidence in any field still missing....

Antibacterial surfaces have an enormous economic and social impact on the worldwide technological fight against diseases. However, bacteria develop resistance coatings are often not uniform stable in time. The challenge is finding antibacterial coating that biocompatible, cost-effective, toxic, spreadable over large irregular surfaces. Here we demonstrate cloak by laser printing of graphene oxide hydrogels mimicking Cancer Pagurus carapace. We observe up to 90% reduction cells. This exploits...

We study artificial neural networks with nonlinear waves as a computing reservoir. discuss universality and the conditions to learn dataset in terms of output channels nonlinearity. A feed-forward three-layered model, an encoding input layer, wave decoding readout, behaves conventional network approximating mathematical functions, real-world datasets, universal Boolean gates. The rank transmission matrix has fundamental role assessing learning abilities wave. For given set training points,...

We observe the formation of an intense optical wave packet fully localized in all dimensions, i.e., both longitudinally (in time) and transverse plane, with extension a few tens fsec microns, respectively. Our measurements show that self-trapped is X-shaped light bullet spontaneously generated from standard laser via nonlinear material response (i.e., second-harmonic generation), which extend soliton concept to new realm, where main hump coexists conical tails reflect symmetry linear...

Nonlinear optical media that are normally dispersive support a new type of localized (nondiffractive and nondispersive) wave packets X shaped in space time have slower than exponential decay. High-intensity waves, unlike linear ones, can be formed spontaneously through trigger mechanism conical emission, thus playing an important role experiments.

Using mW light beams to generate spatial solitons in nematic liquid crystals, all-optical switching/logic can be performed on a signal launched the soliton-induced waveguides. Through collisional behavior of nonlocal medium, steered angle and output position. A power-dependent X junction, AND, NOR gates are demonstrated.

We investigate the formation of collisionless shocks along spatial profile a Gaussian laser beam propagating in nonlocal nonlinear media. For defocusing nonlinearity shock survives smoothing effect response, though its dynamics is qualitatively affected by latter, whereas for focusing it dominates over filamentation. The patterns observed thermal medium are interpreted framework our theory.

We investigate the propagation of a dark beam in defocusing medium strong nonlinear regime. observe for first time shock fan filled with noninteracting one-dimensional gray solitons that emanates from gradient catastrophe developing around null optical intensity. This scenario turns out to be very robust, persisting also when material nonlocal response averages nonlinearity over dimensions much larger than emerging soliton filaments.

Abstract Topology opens many new horizons for photonics, from integrated optics to lasers. The complexity of large-scale devices asks an effective solution the inverse problem: how best engineer topology a specific application? We introduce machine-learning approach applicable in general numerous topological problems. As toy model, we train neural network with Aubry–Andre–Harper band structure model and then adopt solving problem. Our application is able identify parameters complex insulator...

The development of new pharmacological strategies that evade bacterial resistance has become a compelling worldwide challenge. Graphene oxide (GO) can represent the nanotechnology answer being economical and easy to produce degrade having multitarget specificity against bacteria. Several groups tried define interaction between GO sheets human pathogens. Unfortunately, controversial results from inhibition growth enhancement have been reported. main difference among all experimental evidence...

Rogue waves are observed as light propagates in the extreme nonlinear regime that occurs when a photorefractive ferroelectric crystal is undergoing structural phase transition. The transmitted spatial distribution contains bright localized spots of anomalously large intensity follow signature long-tail statistics disappears nonlinearity weakened. isolated wave events form out-of-equilibrium response and disorder enhance Kerr-saturated at critical point. Self-similarity associable to...

One of the most controversial phenomena in nonlinear dynamics is recurrence initial conditions. New optical experiments reveal origin this enigma and demonstrate ability to reconstruct condition an unstable system.

Standing out as the new wonder bidimensional material, graphene oxide (GO) has aroused an exceptional interest in biomedical research by holding promise for being antibacterial of future. First, GO possesses a specific interaction with microorganisms combined mild toxicity human cells. Additionally, its action seems to be directed multiple targets pathogens, causing both membranes mechanical injury and oxidative stress. Lastly, compared other carbon materials, easy low-cost processing is...

Disorder is emerging as a strategy for fabricating random laser sources with very promising materials, such perovskites, which standard cavities are not effective or too expensive. We need, however, different fabrication protocols and technologies reducing the threshold controlling its emission. Here, we demonstrate an effectively solvent-engineered method high-quality perovskite thin films on flexible polyimide substrate. The fractal exhibit excellent optical properties at room temperature...

Nematicons are self-trapped light beams in nematic liquid crystalline systems. Thanks to their optically nonlinear, saturable, nonlocal and nonresonant response, they enable self-confine guide additional optical signals, making them an ideal testbed for applications all-optical information processing.