Type

Journal Article

Authors

Jing Wang
Werner Blau
Mathias Senge
Monika Zawadzka

Subjects

Physics

Topics
z scan time factors dimethylformamide excited states optical limiting nanoscience materials absorption chemistry photolysis two photon absorption solvents nonlinear scattering porphyrins chlorobenzene chlorobenzenes nonlinear

Solvent effect on the nonlinear absorption of 5,10-A2B2 meso substituted porphyrins (2013)

Abstract The effect of the solvent on the nonlinear absorptive properties of two series of 5,10-A 2 B 2 porphyrins was investigated with an open Z-scan technique in the ns time regime. The recorded responses, which varied between compounds and solvents, were fitted to a four-level model where the one-photon excited state absorption is followed by a two-photon process arising from the higher excited states. For most of the compounds the positive nonlinear absorption in toluene was stronger than that in DMF and chloroform. This was attributed to enhanced two-photon absorption in toluene. For DMF and chloroform the solvent effects were most likely to be compound specific. It was demonstrated that the high saturation intensity of two-photon absorption shifts the RSA/SA turnover into a higher fluence range, which is desirable for optical limiting applications. This saturation intensity of two-photon absorption varied between compounds and solvents. Additionally, nonlinear scattering contributed strongly to the open Z-scan responses for many compounds in chlorobenzene and chloroform ? chlorobenzene solutions. This was associated with the photodegradation of chlorobenzene.
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Full list of authors on original publication

Jing Wang, Werner Blau, Mathias Senge, Monika Zawadzka

Experts in our system

1
Werner Blau
Trinity College Dublin
Total Publications: 109
 
2
Mathias Senge
Trinity College Dublin
Total Publications: 194
 
3
Monika Zawadzka
Trinity College Dublin
Total Publications: 7