کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5376006 | 1504310 | 2008 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Comparison of nonlinear absorption in three similar dyes: Polymethine, squaraine and tetraone
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We performed a detailed experimental investigation and quantum-chemical analysis of two-photon absorption (2PA) spectra of symmetrical cationic polymethine and neutral squaraine and tetraone dyes having nearly identical terminal groups and similar conjugation length. Squaraine and tetraone structures differ from polymethines in that their conjugated backbone includes an electron accepting bridge. Frequency degenerate 2PA spectra of these molecules are measured by two-photon fluorescence spectroscopy and the Z-scan technique. Comparing 2PA spectra of polymethine with squaraine and tetraone structures, we find that we can access considerably larger 2PA cross-sections (⩾8000 Ã 10â50 cm4 s/photon) in the squaraine and tetraone molecules due to an increase in the density of final states introduced by the electron accepting bridge in the conjugated chain. We discuss the difference in electronic structure for these molecules and introduce a link between 2PA and excited-state absorption spectra. The results of these experiments combined with agreement of quantum-chemical calculations moves us closer to a predictive capability for the relation between molecular structure and nonlinear optical properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 348, Issues 1â3, 2 June 2008, Pages 143-151
Journal: Chemical Physics - Volume 348, Issues 1â3, 2 June 2008, Pages 143-151
نویسندگان
Scott Webster, Jie Fu, Lazaro A. Padilha, Olga V. Przhonska, David J. Hagan, Eric W. Van Stryland, Mikhail V. Bondar, Yuriy L. Slominsky, Alexei D. Kachkovski,