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...

Abstract As atoms and molecules condense to form solids, a crystalline state can emerge with its highly ordered geometry subnanometric lattice constant. In some physical systems, such as ferroelectric perovskites, perfect structure forms even when the condensing substances are non-stoichiometric. The resulting solids have compositional disorder complex macroscopic properties, giant susceptibilities non-ergodicity. Here, we observe spontaneous formation of cubic in composite...

A landmark of statistical mechanics, spin-glass theory describes critical phenomena in disordered systems that range from condensed matter to biophysics and social dynamics. The most fascinating concept is the breaking replica symmetry: identical copies randomly interacting system manifest completely different Replica symmetry has been predicted nonlinear wave propagation, including Bose-Einstein condensates optics, but it never observed. Here, we report experimental evidence optical a...

We report the direct observation of onset turbulence in propagating one-dimensional optical waves. The transition occurs as disordered hosting material passes from being linear to one with extreme nonlinearity. As response grows, increased wave interaction causes a modulational unstable quasihomogeneous flow be superseded by chaotic and spatially incoherent one. Statistical analysis high-resolution behavior turbulent regime unveils emergence concomitant rogue transition, observed...

We demonstrate an electro-optic response that is linear in the amplitude but independent of sign applied electric field.The symmetry-preserving effect emerges at low fields freezing nanodisordered KNTN above dielectric peak temperature, deep into nominal paraelectric phase.Strong temperature dependence allows us to attribute phenomenon anomalously reduced thermal agitation reorientational underlying polar-nanoregions.

We propose and provide experimental evidence of a mechanism able to support negative intrinsic effective mass. The idea is use shape-sensitive nonlinearity change the sign mass in leading linear propagation equation. Intrinsic negative-mass dynamics reported for light beams ferroelectric crystal substrate, where diffusive photorefractive leads Schr\"odinger signature inverted observation repelled from strongly guiding integrated waveguides irrespective wavelength intensity suggests as basic

We study the formation of 2D self-trapped beams in nanodisordered potassium-sodium-tantalate-niobate (KNTN) cooled below dynamic glass transition. Supercooling is shown to accelerate photorefractive response and enhance steady-state anisotropy. Effects excited state are attributed anomalous slim-loop polarization curve typical relaxors dominated by non-interacting polar-nano-regions.

We report the simultaneous diffraction cancellation for beams of different wavelengths in out-of-equilibrium dipolar glass.The effect is supported by photorefractive diffusive nonlinearity and scale-free optics, can find application imaging microscopy.

We observe chaotic optical wave dynamics characterized by erratic energy transfer and soliton annihilation creation in the aftermath of a three-soliton collision photorefractive crystal. Irregular are found to be mediated nonlinear Raman effect, coherent interaction that leads nonreciprocal exchange. Results extend analogy between solitons particles emergence chaos three-body physics provide new insight into origin irregular accompany extreme rogue waves.

Fabricating integrated waveguides using light is key to realizing miniaturized optical circuits and networks in a full three-dimensional volume, an achievement that presently hampered by diffraction the writing beams. The authors demonstrate use of nondiffracting Bessel beams write support localized modes, so no occurs during fabrication. Creations include single, double, multiwaveguide splitters couplers, along with electro-optic modulators, family components can pave way densely packed...

We study theoretically and experimentally the propagation of optical solitons in a lattice nonlinearity, periodic pattern that both affects is strongly affected by wave. Observations are carried out using spatial photorefractive volume microstructured crystal with built-in oscillating low-frequency dielectric constant. The causes an electro-optic response induces nonlinearity. On-axis results potassium-lithium-tantalate-niobate indicate appearance effective continuous saturated-Kerr...

We demonstrate how the emergence of extreme events strongly depends on correlation length input field distribution. Observing behavior optical waves in turbulent photorefractive propagation with partially incoherent excitations, we find that rogue are enhanced for a characteristic scale. Waveform analysis identifies this scale peak-intensity-independent wave size, suggesting general role played by saturation nonlinear response phenomena.

We perform redundant x-ray diffraction versus temperature experiments in bulk transparent KTN. find a violation of the standard perovskite cubic-to-tetragonal symmetry breaking at Curie point form an orthorhombic cell distortion. The lattice distortion spans coherently macroscopic volumes sample and is characterized by negative-to-zero thermal volume expansion. Dielectric measurements calorimetry indicate that anomalous behavior not associated to distinct thermodynamic phase. comparison...

We investigate the evolution of state polarization light propagating through bulk depoled composite ferroelectrics below Curie temperature. In contrast to standard ferroelectrics, where random birefringence causes depolarization and scattering, is observed suffer varying degrees remains fully polarized when linearly along crystal principal axes. The effect found be supported by formation speckles organized into a spatial lattice occurs as ferroelectric settles spontaneous super-crystal,...

We study experimentally the aging of optical spatial solitons in a dipolar glass hosted by nanodisordered sample photorefractive potassium-sodium-tantalate-niobate (KNTN). As system ages, waves erratically explore varying strengths nonlinear response, causing them to break up and scatter. show that this process can still lead solitons, but generalized form for which changing response is compensated normalized wave size intensity so as maintain fixed waveform.

Abstract A hyperbolic medium will transfer super-resolved optical waveforms with no distortion, support negative refraction, superlensing, and harbor nontrivial topological photonic phases. Evidence of effects is found in periodic resonant systems for weakly diffracting beams, metasurfaces, even naturally layered systems. At present, an actual propagation requires the use metamaterials, a solution that accompanied by constraints on wavelength, geometry, considerable losses. We show how...

We predict and observe Bessel-beam optical self-trapping in a strongly self-focusing medium. Nonlinearity leads to solutions with signature pulsing along the propagation direction, breather that we photorefractive potassium-lithium-tantalate-niobate crystal. The nonlinear construct is formed as an interference pattern locks together diffracting wave.

We perform percolation analysis of crossed-polarizer transmission images in a biased nanodisordered bulk KTN:Li perovskite. Two distinct percolative transitions are identified at two electric field thresholds. The low-field transition involves directional fractal chain dimension $\mathcal{D}=1.65$, while the high-field has $\mathcal{D}>2$. Direct cluster imaging volume is achieved using high-resolution orthographic 3D projections based on giant refraction. Percolation attributed to...

Anti-diffraction is a theoretically predicted nonlinear optical phenomenon that occurs when light beam spontaneously focalizes independently of its intensity.We observe anti-diffracting beams supported by the peak-intensity-independent diffusive nonlinearity are able to shrink below their diffraction-limited size in photorefractive lithium-enriched potassium-tantalate-niobate (KTN:Li).

We report the observation of diffraction cancellation for visible beams with widths from tens wavelengths down to fractions optical wavelength. The phenomenon is observed at transition diffraction- antidiffraction-dominated beam propagation, triggered by a thermal shock in photorefractive nanodisordered lithium-enriched potassium-tantalate-niobate (KTN:Li) crystal. Here propagate without distortion, independently intensity and size. Confirming main prediction scale-free-optics model, we find...

We demonstrate the integration of a miniaturized 30(x) μm×30(y) μm×2.7(z) mm electro-optic phase modulator operating in near-IR (λ=980 nm) based on electro-activation funnel waveguide inside paraelectric sample photorefractive potassium lithium tantalate niobate. The forms basic tassel realization reconfigurable optical circuits embedded single solid-state three-dimensional chip.

We report the observation of strong nonreciprocal soliton amplification mediated by a Raman-scattering-like effect in single isolated collisions. A pump is found to lose greater part its energy signal soliton, irrespective pump-signal relative amplitude. The result an efficient rectifying mechanism able accumulate into extreme waves. Experiments are carried out through photorefractive two-wave mixing with gain coefficient up 80 ${\mathrm{cm}}^{\ensuremath{-}1}$ that emerges conditions...

Abstract Nonlinear response in a material increases with its index of refraction as n 4 . Commonly, ~ 1 so that diffraction, dispersion, and chromatic walk-off limit nonlinear scattering. Ferroelectric crystals periodic 3D polarization structure overcome some these constraints through versatile Cherenkov quasi-phase-matching mechanisms. Three-dimensional self-structuring can also lead to giant optical refraction. Here, we perform second-harmonic-generation experiments KTN:Li conditions...