文献类型：期刊文献

英文题名：EFFECTS OF SUBPHASE ADDITIONS ON OPTICAL NONLINEARITY OF HEMICYANINE DERIVATIVE LANGMUIR-BLODGETT MONOLAYERS

作者：Ma, Shihong[1]; Lu, Xingze[1]; Han, Kui[1]; Liu, Liying[1]; Wang, Wencheng[1]; Zhang, Zhiming[1]; Zhang, Zhaokui[1]; Zhong, Juhua[1]

机构：[1]E CHINA UNIV CHEM TECHNOL, DEPT PHYS, SHANGHAI 200237, PEOPLES R CHINA

年份：1995

卷号：256

期号：1-2

起止页码：215

外文期刊名：THIN SOLID FILMS

收录：;EI(收录号：1995192623800);WOS:【SCI-EXPANDED(收录号:WOS:A1995QF10200037)】；

语种：英文

外文关键词：LANGMUIR-BLODGETT FILMS; OPTICAL PROPERTIES; 2ND HARMONIC GENERATION

摘要：UV-visible absorption spectroscopy and second-harmonic generation were used to examine the effects of potassium iodide (KI) in the subphase on the optical and structural properties of pure and mixed hemicyanine derivative (DAEP) monolayers. It was found that with increasing KI concentration in the subphase, an enhancement of the effective molecular hyperpolarizability beta was always associated with a red shift of the absorption peak in both pure and mixed DAEP monolayers. Three mechanisms (''spacer'' effect, charge distribution change and structural improvement) were responsible for the observed beta enhancement. The first two contributions were comparable and explained by a 2 omega resonance effect.