微加工
聚合
吸收(声学)
三维光学数据存储
紫外线
材料科学
光子
双光子激发显微术
激光器
光子学
双光子吸收
光存储
光电子学
物理
光学
聚合物
复合材料
制作
病理
替代医学
荧光
医学
作者
B. H. Cumpston,S. P. Ananthavel,Stephen Barlow,Daniel L. Dyer,J. E. Ehrlich,L. Erskine,Ahmed A. Heikal,Stephen M. Kuebler,I. Y.Sandy Lee,D. McCord-Maughon,Jin Qin,Harald Röckel,Mariacristina Rumi,Xiaolin Wu,Seth R. Marder,Joseph W. Perry
出处
期刊:Nature
[Springer Nature]
日期:1999-03-01
卷期号:398 (6722): 51-54
被引量:1998
摘要
Two-photon excitation provides a means of activating chemical or physical processes with high spatial resolution in three dimensions and has made possible the development of three-dimensional fluorescence imaging1, optical data storage2,3 and lithographic microfabrication4,5,6. These applications take advantage of the fact that the two-photon absorption probability depends quadratically on intensity, so under tight-focusing conditions, the absorption is confined at the focus to a volume of order λ3 (where λ is the laser wavelength). Any subsequent process, such as fluorescence or a photoinduced chemical reaction, is also localized in this small volume. Although three-dimensional data storage and microfabrication have been illustrated using two-photon-initiated polymerization of resins incorporating conventional ultraviolet-absorbing initiators, such photopolymer systems exhibit low photosensitivity as the initiators have small two-photon absorption cross-sections (δ). Consequently, this approach requires high laser power, and its widespread use remains impractical. Here we report on a class of π;-conjugated compounds that exhibit large δ (as high as 1, 250 × 10−50 cm4 s per photon) and enhanced two-photon sensitivity relative to ultraviolet initiators. Two-photon excitable resins based on these new initiators have been developed and used to demonstrate a scheme for three-dimensional data storage which permits fluorescent and refractive read-out, and the fabrication of three-dimensional micro-optical and micromechanical structures, including photonic-bandgap-type structures7.
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