Cationic two-photon induced polymerization with high dynamic range

Yuri Boiko, Joannes M. Costa, Mark Wang, Sadik Esener

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


Cationic-induced two-photon photo-polymerization is demonstrated at 710 nm, using an isopropylthioxanthone / diarylidonium salt initiating system for the cationic polymerization of an epoxide. In-situ monitoring of the polymer conversion using interferometry allows for determination of the polymerization threshold J2th, polymerization rate R and its dependence of initiator's concentration z. Best J2th achieved is 1 GW/cm 2, with a dynamic range of > 100, i.e. the material can be fully polymerized at intensities > 100 times the threshold level without damage. The R is found to be proportional to the m=1.7 power of the intensity, or R = [C (J-J2th)]m = [C (J-J2th)]1.7, which implies a significantly stronger localization of the photochemical response than that of free radical photoinitiators. Both R and J2th significantly improve when the concentration z of the initiator (onium salt) increases, reduction of J2th exhibiting z-m trend.

Original languageEnglish (US)
Pages (from-to)571-584
Number of pages14
JournalOptics express
Issue number10
StatePublished - May 2001
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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