文献类型：会议论文

英文题名：Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers

作者：Wang, Chuang[1];Gao, Feng[2];Zeng, Hao[2];Ma, Shihong[2];Liu, Wei[1];Liu, Liying[1];Wang, Wencheng[1];Tian, He[3]

机构：[1]Fudan Univ, State Key Lab Adv Photon Mat & Devices, Shanghai 200433, Peoples R China;[2]Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China;[3]East China Univ Sci & Technol, Chem & Pharmaceut Inst, Shanghai 200237, Peoples R China

会议论文集：Conference on Linear and Nonlinear Optics of Organic Materials VI

会议日期：AUG 15-17, 2006

会议地点：San Diego, CA

语种：英文

外文关键词：Langmuir-Blodgett film; UV-visible spectra; second-harmonic generation (SHG); cyanine dye

摘要：We investigated on cyanine dye (HQ) in Langinuir and Langinuir-Blodgett (LB) films using UV-visible spectra and second-harmonic generation (SHG) methods. UV-visible spectra indicated a uniform film transfer. The significant SHG fringe signal as a function of angle of incidence for Z-type LB films observed respectively. The second-order susceptibility X-ZZZ((2))=, refractive indexes at 532 nm as well as the average tilt angle psi between the molecular (dipolar) axis and surface normal, obtained by means of fitting the SHG data, are 42 pM V-1, 1.4841, 57 degrees and 32 pM V-1, 1.4775, 530 for LB films without and with Cd2+ ions, respectively. These high nonlinearities are due to resonant enhancement resulting from the proximity of the second harmonic wavelength to the absorption band of the films.