SHUR , Vladimir

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The creation of periodic domain structures in lithium niobate crystals makes it possible to realize highly efficient nonlinear optical interactions in optical waveguides. The influence of near‐surface H + ion concentration gradient on the domain kinetics in uniform electric field in lithium niobate crystals modified by soft proton exchange is...

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The results of an experimental study of the abnormal domain structure kinetics in lithium niobate single crystals with a surface layer modified by soft proton exchange are presented. Domain switching in a wide field range allowed two qualitatively different types of domain structure evolution to be revealed: (1) the traditional growth of...

The paper presents the results of an experimental study of the local polarization reversal and creation of domains by a biased tip of scanning probe microscope (SPM) in lithium niobate single crystals of congruent composition with a surface layer modified by soft proton exchange (SPE). The depth dependence of H[Formula: see text] ions...

Formation of Nanodomain Structures in Lithium Niobate and Lithium Tantalate Crystals studied by Confocal Raman Microscopy

The domain structure evolution has been studied in congruent lithium niobate crystals with surface layers modified by three different proton exchange techniques. The significant decrease of the nucleation threshold field and qualitative change of domain rays nucleation and growth have been revealed. The formation of a broad domain boundary and...

Nano-domain Structure in Lithium Niobate Modified by Proton Exchange

In this paper, we present the material characterization that has been made to explain the poor nonlinear performance observed in certain channel waveguides produced by soft proton exchange in periodically poled congruent lithium niobate (PPLN) crystals. The study was performed using complementary methods of domain visualization: piezoelectric...

International audience

Depending on the chosen fabrication process, nonlinear waveguides realized in periodically oriented material such as PPLN can present different fabrication errors. In this paper we present a detailed numerical study of the impact on the nonlinear performances of one or several stitching errors occurring during the realization of the periodic...

In integrated photonics, the precise knowledge of the waveguides refractive index profile is mandatory for the modeling of photonic chips and therefore implementing innovative circuits. Usual index profile determination relies on effective index measurement of propagating modes in planar waveguides coupled with numerical fitting tools. In this...

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The strong dependence of the domain kinetics on the applied field and the thickness of the surface layers produced by proton exchange has been revealed in congruent lithium niobate. The correlated nucleation leads to formation of self-assembled structures consisting of isolated domains. Formation of the nanodomains in front of the domain wall...

International audience

Dans cette étude, pour nous assurer que la fabrication des guides n'induise aucun effet parasites comme la création de nanodomaines, la réductions du coefficient non linéaire ou le coupage des polarisations ordinaires et extra-ordinaire induit par les contraintes mécaniques, nous avons utilisé des guides à gradient d'indice présentant une très...

Formation of domain structure by electron beam irradiation in congruent lithium niobate covered by surface dielectric layer with planar and channel waveguides produced by Soft Proton Exchange (SPE) process has been studied. Formation of domains with arbitrary shapes as a result of discrete switching has been revealed. The fact was attributed to...

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