Plasmonic Enhancement of the Two Photon Absorption Cross Section of an Organic Chromophore Using Polyelectrolyte-Coated Gold Nanorods

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• 作者：Sean T. Sivapalan ; Jarrett H. Vella ; Timothy K. Yang ; Matthew J. Dalton ; Rachel N. Swiger ; Joy E. Haley ; Thomas M. Cooper ; Augustine M. Urbas ; Loon-Seng Tan ; Catherine J. Murphy
• 刊名：Langmuir
• 出版年：2012
• 出版时间：June 19, 2012
• 年：2012
• 卷：28
• 期：24
• 页码：9147-9154
• 全文大小：361K
• 年卷期：v.28,no.24(June 19, 2012)
• ISSN：1520-5827

文摘

The effect of plasmonic enhancement on the two-photon absorption cross section of organic chromophores attached to polyelectrolyte-coated gold nanorods was investigated. The magnitudes of such enhancements were confirmed using single and two photon excitations of the chromophore molecules bound to polyelectrolyte-coated gold nanorods. By synthesizing two-, four-, six-, and eight-polyelectrolyte layer coated nanorods of a particular aspect ratio, the distance dependence of the evanescent electromagnetic field on molecular two-photon absorption was observed. Enhancements of 40-fold were observed for the chromophores nearest to the surface.