Third-Order Nonlinear Optical Properties of a Series of Polythiophenes

The third-order nonlinear optical properties of a series of polythiophenes are investigated with the Z-scan method under picosecond pulse laser irradiation at 532 nm. The copolymers exhibit a good nonlinear response: large nonlinear refraction coefficients without nonlinear absorption. The signs of...

Full description

Saved in:
Bibliographic Details
Published in:Chinese physics letters 2010-07, Vol.27 (7), p.074201-074201
Main Authors: Zhang, Xiao-Qiang, Wang, Chang-Shun, Lu, Guo-Yuan, He, Ting-Chao
Format: Article
Language:English
Subjects:
Accounting
Copolymers
Lasers
Nonlinearity
Optical properties
Picosecond pulses
Polythiophene
Refraction
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:The third-order nonlinear optical properties of a series of polythiophenes are investigated with the Z-scan method under picosecond pulse laser irradiation at 532 nm. The copolymers exhibit a good nonlinear response: large nonlinear refraction coefficients without nonlinear absorption. The signs of nonlinear refraction coefficients are positive, which are opposite to the negative signs of the polythiophene reported before. The mechanism accounting for the process of nonlinear refraction under pulse laser excitation is analyzed from the viewpoint of the electron-donor/acceptor units of polythiophenes. Moreover, changes of nonlinearity according to the lengths of main chains in polythiophene molecules are discussed.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/27/7/074201