Degenerate Multi-Photon Properties of Spirofluorene Derivatives
Authors: Cho, Namchul; Baldeck, Patrice L.; He, Guang S.; Hwang, Do-Hoon; Prasad, Paras N.; Prabhakaran, Prém; Kim, Tae-Dong; Lee, Kwang-Sup
Source: Journal of Nanoscience and Nanotechnology, Volume 10, Number 10, October 2010 , pp. 6958-6961(4)
Publisher: American Scientific Publishers
Abstract:Two- and three-photon absorption properties of the fluorene-based chromophores have been investigated. The two- and three-photon absorption cross-section are found to be increased with the strength of the electron donor groups in the order of N-ethylcarbazoyl (1), triphenylamino (2), and N,N-dibutylanilino (3) groups. This nonlinear absorption enhancement can be interpreted by the increase of intramolecular charge transfer facilitated by strong electron donors and the decreased detuning energy (ΔE). Furthermore, direct laser microfabrication by two-photon photopolymerization with compound 2 as a two-photon sensitizer was carried out. Laser exposure time-dependent lateral voxel size has also been studied.
Document Type: Research Article
Publication date: 2010-10-01
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