Threshold enhancement in two-photon photopolymerization

Yuri Boiko, M. Shane Bowen, Mark Wang, Joe Costa, Sadik Esener

Research output: Contribution to journalConference article

4 Scopus citations

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 of 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.

Original languageEnglish (US)
Pages (from-to)254-263
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4097
StatePublished - Jan 1 2000
EventComplex Mediums - San Diego, CA, USA
Duration: Jul 30 2000Aug 1 2000

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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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