Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers

Chuang Wang; Feng Gao; Hao Zeng; Shihong Ma; Wei Liu; Liying Liu; Wencheng Wang; He Tian

doi:10.1117/12.674109

14 September 2006 Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers

Chuang Wang, Feng Gao, Hao Zeng, Shihong Ma, Wei Liu, Liying Liu, Wencheng Wang, He Tian

Proceedings Volume 6331, Linear and Nonlinear Optics of Organic Materials VI; 633114 (2006) https://doi.org/10.1117/12.674109
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

Citation Download Citation

Chuang Wang, Feng Gao, Hao Zeng, Shihong Ma, Wei Liu, Liying Liu, Wencheng Wang, and He Tian "Linear and nonlinear optical properties in new cyanine dye Langmuir-Blodgett multilayers", Proc. SPIE 6331, Linear and Nonlinear Optics of Organic Materials VI, 633114 (14 September 2006); https://doi.org/10.1117/12.674109

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