Issue 1, 2004

Highly sensitive two-photonchromophores applied to three-dimensional lithographic microfabrication: design, synthesis and characterization towards two-photon absorption cross section

Abstract

A series of D–π–A–π–D type chromophores were synthesized by the dehydration reaction of 4-R2N-benzaldehye (R = Ph, Bun, Et, Me) and diaminomaleonitrile (corresponding to the chromophores 1, 2, 3 and 4, respectively), in which a polar imino double bond (–C[double bond, length as m-dash]N–) replaced the double bond (–CH[double bond, length as m-dash]CH–) in the π-conjugated centers. Femtosecond laser induced fluorescence intensity was used to evaluate two-photon absorption (TPA) cross sections, δ, using a USB-2000 CCD. Results show a change of terminal groups from Ph2N– to Me2N– influenced the δ value significantly through a change of the quantum yield, φ. However, the two-photon absorption peak position was only slightly affected. The chromophores 2 and 3 were found to afford polymers in the presence of the functional triacrylate monomer at low laser power at 755 and 820 nm. This demonstrated that the enhanced δ value was not a main factor in the improvement of chromophore two-photon photosensitivity. Such information can be useful in the design of more efficient two-photon chromophores for imaging and power-limiting applications.

Graphical abstract: Highly sensitive two-photon chromophores applied to three-dimensional lithographic microfabrication: design, synthesis and characterization towards two-photon absorption cross section

Article information

Article type
Paper
Submitted
05 Aug 2003
Accepted
17 Sep 2003
First published
14 Oct 2003

J. Mater. Chem., 2004,14, 75-80

Highly sensitive two-photon chromophores applied to three-dimensional lithographic microfabrication: design, synthesis and characterization towards two-photon absorption cross section

Y. Lu, F. Hasegawa, T. Goto, S. Ohkuma, S. Fukuhara, Y. Kawazu, K. Totani, T. Yamashita and T. Watanabe, J. Mater. Chem., 2004, 14, 75 DOI: 10.1039/B309023J

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