Title

Two-Photon Absorption Cross-Sections Of Common Photoinitiators

Keywords

Darocure; Irgacure; Photoinitiators; Photopolymerization; Two-photon absorption

Abstract

Recent interests in and applications of two-photon absorption (2PA) induced photopolymerization have afforded advanced opportunities to perform three-dimensionally resolved polymerization, resulting in intricate microfabrication and imaging. Many of the reported 2PA-induced polymerizations make use of commercially available photoinitiators, and a key parameter to consider is the two-photon absorption cross-section (δ) of the initiator. To date, there has been no comprehensive investigation of two-photon absorptivity of commercial photoinitiators, though a few studies presenting novel photoinitiators for two-photon polymerization have appeared. Herein, we report the 2PA properties of common, commercially available photoinitiators typically utilized in conventional radiation curing science and technologies, and often used in 2PA-based polymerizations. Z-scan and white-light continuum (WLC) pump-probe techniques were utilized to obtain two-photon absorption cross-sections (δ). The results for most compounds were found to yield good agreement between the two methods. Most of the photoinitiators studied possess low δ, except Irgacure OXE01, indicating a need for the development of new photoinitiators with improved properties optimized for 2PA applications. A compound prepared in our laboratories exhibits high 2PA and was useful as a two-photon free-radical photoinitiator. © 2004 Elsevier B.V. All rights reserved.

Publication Date

3-15-2004

Publication Title

Journal of Photochemistry and Photobiology A: Chemistry

Volume

162

Issue

2-3

Number of Pages

497-502

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1016/S1010-6030(03)00394-0

Socpus ID

1342307566 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/1342307566

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