Third Order Nonlinear Optical Properties of Polycrystalline Octithiophene Thin Films Studied by Electroabsorption Spectroscopy
作者:
Christine Videlot,
Abderahim Yassar,
Denis Fichou,
Takashi Isoshima,
Tatsuo Wada,
Hiroyuki Sasabe,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 1998)
卷期:
Volume 322,
issue 1
页码: 29-34
ISSN:1058-725X
年代: 1998
DOI:10.1080/10587259808030196
出版商: Taylor & Francis Group
关键词: electroabsorption spectroscopy;α-octithiophene;evaporated polycrystalline thin films;third-order nonlinear optical properties
数据来源: Taylor
摘要:
Electroabsorption (EA) studies at room temperature on polycrystalline thin films of α-octithiophene (8T), the longest non-substituted model oligomer of polythiophene, are reported. The EA spectra obtained on isotropic 8T films deposited on top of coplanar electrodes exhibit several intense and narrow peaks in the absorption region and on the absorption edge. They are compared with the derivatives of absorption spectrum, and it is shown that the excitation in the longer wavelength absorption presents a Frenkel exciton character. Third-order nonlinear optical susceptibilityx(3)(ωω, 0, 0) is evaluated to be in the order of 10−10esu at its maximum.
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