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Third Order Non-Linear Optical Properties of Polyphenylene Vinylene Derivatives in the Infrared Range

Published online by Cambridge University Press:  21 March 2011

Yuri A. Dubitsky ,
Antonio Zaopo ,
Andrea Zappettini ,
Giulia Facchini ,
Franco D Amore ,
Silvia Pietralunga  and
Mario Martinelli
Yuri A. Dubitsky
Affiliation:
Pirelli Cavi e Sistemi S.p.A., Viale Sarca 222, I-20126 Milan, ITALY
Antonio Zaopo
Affiliation:
Pirelli Cavi e Sistemi S.p.A., Viale Sarca 222, I-20126 Milan, ITALY
Andrea Zappettini
Affiliation:
CoreCom, Via Amper 30, I-20131 Milan, ITALY
Giulia Facchini
Affiliation:
CoreCom, Via Amper 30, I-20131 Milan, ITALY
Franco D Amore
Affiliation:
CoreCom, Via Amper 30, I-20131 Milan, ITALY
Silvia Pietralunga
Affiliation:
CoreCom, Via Amper 30, I-20131 Milan, ITALY
Mario Martinelli
Affiliation:
CoreCom, Via Amper 30, I-20131 Milan, ITALY
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Abstract

The non-linear optical properties of poly[1,4-phenylene-1-phenyl vinylene], poly[1,4-phenylene-1,2-di(4′-phenoxyphenyl) vinylene], poly[2,5-dioctyloxy-1,4-phenylene vinylene] and poly[2- methoxy -5- (2'-ethylhexyloxy)-1,4-phenylene vinylene] MEH-PPV with different molecular weights were studied by the Third Harmonic Generation (THG) technique. The dispersion of the χ3 coefficient was measured in the wide infra red range from 1.2 up to 2.1 μm. It was shown that the highest χ3 value, observed for the high molecular weight MEH-PPV (Mw 230.000), reaches the maximum of 8x10-11 esu at 1.77 μm. At the same time, the medium molecular weight MEH-PPV (Mw 95.000) demonstrated not significantly different χ3 value of 6x10-11 esu. The dispersion of the χ3 coefficient was compared to the absorption of the third harmonic beam and strong χ3 enhancement relative to the excitonic absorption was observed. However, a surprising shift of about 70 nm towards the longer wavelengths between the two peaks was always observed for all studied PPV derivatives. The results of THG measurements were compared to those obtained by conventional Zscan technique in the same range. It was shown that the THG χ3 values in infrared range were up to one order of magnitude lower than those of direct Z-scan measurements.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 665: Symposium C – Electronic, Optical and Optoelectronic Polymers and Oligomers , 2001 , C1.4
Copyright
Copyright © Materials Research Society 2001

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References

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