کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5442465 | 1510762 | 2017 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Experimental and theoretical simulation studies on picosecond closed-aperture Z-scan profiles of N,Nâ²-Bis(2,5,-di-tert-butylphenyl)-3,4,9,10-perylenedicarboximide (DBPI)
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The optical nonlinear refractive and absorptive parameters of the dye N,Nâ²-Bis(2,5,-di-tert-butylphenyl)-3,4,9,10-perylenedicarboximide (DBPI) in 96% sulphuric acid have been obtained by a single closed-aperture (CA) Z-scan technique with picosecond pulses at the wavelength of 532Â nm. Here a theoretical model was used to deduce both the refractive and absorptive optical nonlinearity present simultaneously in the CA Z-scan profile. Under the range of concentrations and energies studied here, we found that the effect of saturable absorption (SA) is dominating at higher concentrations (i.e. 1.0Â ÃÂ 10â3Â M), whereas the reverse saturable absorption (RSA) effect was taken over at dilute concentrations (i.e. 1.0Â ÃÂ 10â4Â M and 1.0Â ÃÂ 10â5Â M). The dominance of absorptive nonlinearity over the refractive nonlinearity results in a low value of the refractive cross-section (Ïr). A relative increase in the value of Ïr is observed with decrease in the dye concentration. Mathematical modeling of CA Z-scan profiles of DBPI shows the existence of peak-valley or valley-peak structure depending upon the contribution of nonlinear absorption. The optical nonlinear parameters have also been estimated by theoretical simulation studies as a function of wavelength and compared with the experimental results. The dye DBPI has been found to be suitable as an important highly photostable molecule for photonic devices in the visible region (400-630Â nm).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 72, October 2017, Pages 233-240
Journal: Optical Materials - Volume 72, October 2017, Pages 233-240
نویسندگان
Umakanta Tripathy, Sailaja Rallabandi, Prem B. Bisht,