ULTRAFAST NONLINEAR-OPTICAL RESPONSE AND ACOUSTIC-PHONON GENERATION IN POLY(ALKOXY-THIOPHENE) FILM WITH REGIOREGULAR STRUCTURE

Authors
NISOLI M PRUNERI V DESILVESTRI S MAGNI V GALLAZZI AM ROMANONI C ZERBI G ZOTTI G
Citation
M. Nisoli et al., ULTRAFAST NONLINEAR-OPTICAL RESPONSE AND ACOUSTIC-PHONON GENERATION IN POLY(ALKOXY-THIOPHENE) FILM WITH REGIOREGULAR STRUCTURE, Chemical physics letters, 220(1-2), 1994, pp. 64-69
Citations number
17
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
220
Issue
1-2
Year of publication
1994
Pages
64 - 69
Database
ISI
SICI code
0009-2614(1994)220:1-2<64:UNRAAG>2.0.ZU;2-A
Abstract
We investigate by femtosecond pump and probe measurements the non-line ar optical response in thin films of poly(4,4'-dipentoxy-2,2'-bithioph ene) and poly(4,4''-dipentoxy-2,2':5',2''-terthiophene), characterized by a high degree of structural regioregularity. These polymers show a fast and high third-order non-linearity. The effects of removing elec trons from the polymer chain in a controlled way by electrochemical do ping have also been studied. Finally a periodic modulation of the opti cal transmission has been observed on an extended time scale, which is related to the propagation of coherent longitudinal acoustic phonons.