High dynamic range cationic two-photon photopolymerization

Y. Boiko, J. M. Costa, M. Wang, S. Esener

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Cationic-induced two-photon photopolymerization is demonstrated at 710 nm, using an isopropylthioxanthone / diarylidonium salt initiating system for the cationic polymerization of an epoxide. The polymerization threshold J2th is found to be approximately 1 GW/cm2, with a dynamic range of > 100, i.e. the material can be fully polymerized at intensities > 100 times the threshold level without damage. The polymerization rate 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 the photochemical response than that of free radical photoinitiators. R and J2th significantly improve when the concentration z of the initiator (onium salt) increases.

Original languageEnglish (US)
Pages (from-to)212-220
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2001
Externally publishedYes
EventOrganic Photonic Materials and Devices III - San Jose, CA, United States
Duration: Jan 24 2001Jan 25 2001


  • Cationic
  • Free radical
  • Microfabrication
  • Photopolymerization
  • Threshold
  • Two-photon absorption

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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