Third-order nonlinear optical spectroscopy in charge-transfer type conjugated polymers

We have investigated the linear and third-order nonlinear optical properties in a charge-transfer (CT) type conjugated copolymer, PThQx, which is composed of an electron-donating molecule, thiophene (Th), and electron-accepting one, quinoxaline (Qx), by using the linear absorption, two-photon absorp...

Full description

Saved in:
Bibliographic Details
Published in:Synthetic metals 2005-09, Vol.153 (1), p.141-144
Main Authors: Kishida, Hideo, Hirota, Keisuke, Wakabayashi, Takeru, Okamoto, Hiroshi, Lee, Ban-Lin, Kokubo, Hisashi, Yamamoto, Takakazu
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Non-linear optical methods
Organic polymers
Physicochemistry of polymers
Polythiophene and derivatives
Properties and characterization
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We have investigated the linear and third-order nonlinear optical properties in a charge-transfer (CT) type conjugated copolymer, PThQx, which is composed of an electron-donating molecule, thiophene (Th), and electron-accepting one, quinoxaline (Qx), by using the linear absorption, two-photon absorption (TPA), and third-harmonic generation (THG) spectroscopies. In comparison with a homopolymer, polythiophene, the absorption coefficient α of PThQx is significantly reduced, while its third-order nonlinear susceptibility (χ (3)) is unchanged. This indicates that the figure of merit for the nonlinear optical materials, defined as χ (3)/α, is enhanced in PThQx. This enhancement comes from the CT character of the excited states in PThQx, in which a hole and an electron are created on different molecules.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2005.07.147