High-dynamic-range cationic two-photon photopolymerization

Yuri B. Boiko; Joannes M. Costa; Mark M. Wang; Sadik C. Esener

doi:10.1117/12.429388

15 June 2001 High-dynamic-range cationic two-photon photopolymerization

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

Proceedings Volume 4279, Organic Photonic Materials and Devices III; (2001) https://doi.org/10.1117/12.429388
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

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 J_2th 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 equals 1.7 power of the intensity, or R equals [C (J-J_2th)]^m equals [C (J-J_2th)]^1.7, which implies a significantly stronger localization of the photochemical response than that of free radical photoinitiators. R and J_2th significantly improve when the concentration z of the initiator (onium salt) increases.

Citation Download Citation

Yuri B. Boiko, Joannes M. Costa, Mark M. Wang, and Sadik C. Esener "High-dynamic-range cationic two-photon photopolymerization", Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); https://doi.org/10.1117/12.429388

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