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Proceedings Paper

Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers
Author(s): Chuang Wang; Feng Gao; Hao Zeng; Shihong Ma; Wei Liu; Liying Liu; Wencheng Wang; He Tian
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Paper Abstract

We investigated on cyanine dye (HQ) in Langmuir and Langmuir-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 χ(2)zzz, refractive indexes at 532 nm as well as the average tilt angle ψ between the molecular (dipolar) axis and surface normal, obtained by means of fitting the SHG data, are 42 pM/V-1, 1.4841, 57° and 32 pM/V-1, 1.4775, 53° 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.

Paper Details

Date Published: 14 September 2006
PDF: 5 pages
Proc. SPIE 6331, Linear and Nonlinear Optics of Organic Materials VI, 633114 (14 September 2006); doi: 10.1117/12.674109
Show Author Affiliations
Chuang Wang, Fudan Univ. (China)
Feng Gao, Fudan Univ. (China)
Hao Zeng, Fudan Univ. (China)
Shihong Ma, Fudan Univ. (China)
Wei Liu, Fudan Univ. (China)
Liying Liu, Fudan Univ. (China)
Wencheng Wang, Fudan Univ. (China)
He Tian, East China Univ. of Science and Technology (China)

Published in SPIE Proceedings Vol. 6331:
Linear and Nonlinear Optics of Organic Materials VI
Robert A. Norwood, Editor(s)

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