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Proceedings Paper

Threshold enhancement in two-photon photpolymerization
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Paper Abstract

It is demonstrated that threshold reduction of two-photon polymerization is achievable by means traditionally employed for sensitivity enhancement for single photon photoinitiation, such as heavy atom enhancement or intersystem crossing, electron donor agent, concentration increase of initiator. It is shown that measured threshold is in reverse proportion to square root of initiator concentration, whereas observed length of induction period exhibits reverse proportionality to the square of light intensity. Overall, experimentally observed threshold values of two-photon induced photopolymerization are effected by all intermediate stages of energy transformation in the photochemical sequences leading to photoinitiation, in particular inter-system crossing of excited initiating molecules as well as by monomer reactivity.

Paper Details

Date Published: 30 June 2000
PDF: 10 pages
Proc. SPIE 4097, Complex Mediums, (30 June 2000); doi: 10.1117/12.390598
Show Author Affiliations
Yuri B. Boiko, Univ. of California/San Diego (United States)
Mark Shane Bowen, Univ. of California/San Diego (United States)
Mark M. Wang, Univ. of California/San Diego (USA) and Call/Recall, Inc. (United States)
Joannes M. Costa, Call/Recall, Inc. (United States)
Sadik C. Esener, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 4097:
Complex Mediums
Akhlesh Lakhtakia; Werner S. Weiglhofer; Russell F. Messier, Editor(s)

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