作者:Namchul Cho、PatriceL. Baldeck、GuangS. He、Do-Hoon Hwang、ParasN. Prasad、Prém Prabhakaran、Tae-Dong Kim、Kwang-Sup Lee
DOI:10.1166/jnn.2010.2975
日期:2010.10.1
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.
研究了芴基发色团的双光子和三光子吸收特性。研究发现,双光子和三光子吸收截面随电子供体基团强度的增加而增大,依次为 N-ethylcarbazoyl (1)、triphenylamino (2) 和 N,N-dibutylanilino (3)。这种非线性吸收增强可解释为强电子供体促进了分子内电荷转移的增加和失谐能(ΔE)的降低。此外,还利用化合物 2 作为双光子敏化剂,通过双光子光聚合直接进行了激光微制造。此外,还研究了激光照射时间与横向体素大小的关系。