Manipulation of ferroelectric domain inversion and growth by optically induced 3D thermoelectric field in lithium niobate

Weexperimentallydemonstratetheuseofafemtosecondlaser-inducedthermoelectricfieldtomanipulateremotely—notonlyatthefocalspot—theinversionandgrowthofferroelectricdomaininlithiumniobate.Theprocessinvolvestwosteps:thefirststepislasermarking,in whichalaserisusedtomarktheoriginofthedesireddomaininversion.Thesecondstepislaserinduction,inwhichalaser-inducedthermo-electricfieldisusedtoinvertthedomainatthemarkersiteanddrivedomaingrowth.Theinducedthermoelectricfieldisdistributedinthreedimensions,whichcansimultaneouslymanipulatethedomaininversionandgrowthlengthofmultiplemarkedsiteswithinadiameteroflm.Thelengthofdomaingrowthissynergisticallycontrolledbythepositionandintensityofmarkingandinduction,whichcan 200 exceed100 l m.Thistwo-steppolingmethodgreatlyimprovestheefficiencyofall-opticalpolingandprovidesadifferentsuiteoftoolsfortai-loringferroelectricdomains.

Applied Physics Letters