Creation of periodical domain structure by local polarization reversal in planar waveguide produced by soft proton exchange in LiNbO_(3)  

作　　者：Evgeniy Savelyev Andrey Akhmatkhanov Boris Slautin Herve Tronche Florent Doutre Tommaso Lunghi Pascal Baldi Vladimir Shur 

机构地区：[1]Institute of Natural Sciences and Mathematics,Ural Federal University 620002 Ekaterinburg,Russia [2]Institut de Physique de Nice,Universite Cote d’Azur,CNRS,06108 Nice Cedex 2,France

出　　处：《Journal of Advanced Dielectrics》2023年第6期39-44,共6页先进电介质学报（英文）

基　　金：supported by the Ministry of Science and Higher Education of the Russian Federation within the Development Program of the Ural Federal University named after the first President of Russia,B.N.Yeltsin,in accordance with the program of strategic academic leadership“Priority-2030”.The equipment of the Ural Center for Shared Use“Modern nanotechnology”at Ural Federal University(Reg.No.2968),which is supported by the Ministry of Science and Higher Education RF(Project No.075-15-2021-677),was used.

摘　　要：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 Ht ions concentration in the SPE-modified layer measured by confocal Raman microscopy demonstrates a sufficient composition gradient.The creation of isolated domains and stripe domain structures has been done by two switching modes:(1)point switching by field application in separated points and(2)line scanning switching by motion of the biased tip being in contact with the sample surface.For point switching for pulse durations less than 10 s,the logarithmic dependence of the domain diameter on the pulse duration was observed.The change of the dependence to a linear one for pulse duration above 10 s has been attributed to the transition from the stochastic step generation at the domain wall to the deterministic one at the domain vertexes.The periodical structure of stripe domains was created in SPE CLN planar waveguides by scanning at elevated temperature.The revealed switching regime suppresses electrostatic interaction of neighboring domains and leads to a significant improvement of the domain structure regularity.The creation of the stable periodical domain structure with submicron periods in SPE CLN planar waveguides was demonstrated.

关 键 词：Scanning probe microscopy piezoelectric force microscopy periodical poling composition gradient 

分 类 号：TH742[机械工程—光学工程]