Ramakrishna Guda, Varnavski Oleg, Kim Junhyung, Lee Dongil, Goodson Theodore
Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
J Am Chem Soc. 2008 Apr 16;130(15):5032-3. doi: 10.1021/ja800341v. Epub 2008 Mar 22.
The two-photon absorption properties of Au25 cluster has been investigated with the aid of two-photon excited fluorescence in the communication wavelength region with a cross-section of 2700 GM at 1290 nm. Additional visible fluorescence has been discovered for small gold clusters which is two-photon allowed (after excitation at 800 nm), and the absolute cross-section has been determined for gold clusters with number of gold atoms varying from 25 to all the way up to 2406 using one and two-photon excited time-resolved fluorescence upconversion measurements. Record high TPA cross-sections have been measured for quantum sized clusters making them suitable for two-photon imaging as well as other applications such as optical power limiting and lithography.
借助通信波长区域的双光子激发荧光，研究了Au25团簇的双光子吸收特性，在1290nm处的截面为2700 GM。对于小金团簇，发现了额外的可见荧光，该荧光是双光子允许的（在800nm激发后），并且使用单光子和双光子激发时间分辨荧光上转换测量，确定了金原子数从25一直到2406的金团簇的绝对截面。已测量到量子尺寸团簇的创纪录高TPA截面，使其适用于双光子成像以及其他应用，如光限幅和光刻。
