{"title":"Optical Nonlinearity Of Co-Polymers Caused By Charge Injection","authors":"B. Lavi, G. Berkovic","doi":"10.1364/otfa.1995.md.21","DOIUrl":null,"url":null,"abstract":"We have shown [1] that asymmetric injection of electric charge into polymer-dye blends can induce second order nonlinear optical effects which are distinct from the more conventional mechanism of using electric fields to align the dye molecules. Using an “in-plane” geometry [1], charges can be injected into polymer-dye films causing symmetry breakage both parallel and perpendicular to the external field. The symmetry breakage perpendicular to the field results from the setting-up of a macroscopic charge gradient, while nonlinearity parallel to the field results from conventional dipolar alignment. Using high voltages but only moderate fields (2000 V across 2mm) charge injection effects can be stronger than dipolar alignment. It is believed that charged dimers and quadrupolar nonlinearities are responsible for the nonlinearity in a charge gradient [2].","PeriodicalId":246676,"journal":{"name":"Organic Thin Films for Photonic Applications","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1995-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Organic Thin Films for Photonic Applications","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/otfa.1995.md.21","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We have shown [1] that asymmetric injection of electric charge into polymer-dye blends can induce second order nonlinear optical effects which are distinct from the more conventional mechanism of using electric fields to align the dye molecules. Using an “in-plane” geometry [1], charges can be injected into polymer-dye films causing symmetry breakage both parallel and perpendicular to the external field. The symmetry breakage perpendicular to the field results from the setting-up of a macroscopic charge gradient, while nonlinearity parallel to the field results from conventional dipolar alignment. Using high voltages but only moderate fields (2000 V across 2mm) charge injection effects can be stronger than dipolar alignment. It is believed that charged dimers and quadrupolar nonlinearities are responsible for the nonlinearity in a charge gradient [2].