Формирование заряженных микро- и нанодоменных стенок в монокристаллах ниобата лития с модифицированной проводимостью: магистерская диссертация

Resultado de la investigación: Master's Thesis

Resumen

The formation of the micro- and nanodomain structures during polarization reversal has been studied in single crystal lithium niobate with inhomogeneously modified conductivity. It is well known that the vacuum annealing and plasma-source ion irradiation of the lithium niobate crystals leads to sufficient increase of the bulk conductivity due to out-diffusion of the oxygen from the sample surface. Creation of layers with modified conductivity leads to inhomogeneous distribution of applied electric field in bulk of ferroelectric crystals. Polarization reversal in such a crystals permits to localize charged domain walls in the bulk. Methods of creation of charged domain walls can be used for the construction of the waveguide structures, optical modulators and resonators. The main conclusions of the work: 1) It was shown that plasma-source ion irradiation and vacuum annealing leads to inhomogeneous change of absorption and increase of the conductivity, which can be attributed to the out-diffusion of oxygen and lithium segregation in the surface layer of crystal. 2) Inhomogeneous distribution of electric field in the bulk of modified crystals leads to significant decrease of switched layer thickness. 3) Effect of formation and growth of non-through domains with charged domain walls has been revealed. 4) Analysis of switching current by modified Kolmogorov-Avraami formula permit to determine mobility of domain wall and threshold filed of polarization reversal.
Título traducido de la contribuciónFormation of charged micro- and nanodomain walls in single crystals of lithium niobate with modified conductivity: Master's thesis
Idioma originalRussian
Supervisores/asesores
  • Шур, Владимир Яковлевич, Supervisor
  • Аликин, Денис Олегович, Supervisor
EstadoPublished - 2014

Huella Profundice en los temas de investigación de 'Формирование заряженных микро- и нанодоменных стенок в монокристаллах ниобата лития с модифицированной проводимостью: магистерская диссертация'. En conjunto forman una huella única.

Citar esto