کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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5390709 | 1505084 | 2008 | 5 صفحه PDF | دانلود رایگان |
We report our results on the nonlinear absorption, and its switching behavior, of two alkoxy phthalocyanines (a) 2,3,9,10,16,17,23,24-octakis-(heptyloxy) phthalocyanine (Pc1) and (b) 2,3,9,10,16,17,23,24-octakis-(heptyloxy) phthalocyanine zinc(II) (Pc2) studied at a wavelength of 800Â nm with â¼100Â fs pulses using the standard Z-scan technique. Both the molecules possessed negative nonlinear refractive index (n2) as revealed by signature of the closed aperture data. Magnitudes of the n2 evaluated were â¼1.26Â ÃÂ 10â13Â esu for Pc1 and â¼1.68Â ÃÂ 10â13Â esu for Pc2. Nonlinear absorption data of Pc1 obtained at a concentration of 5Â ÃÂ 10â4Â M demonstrated complex behavior with switching from reverse saturable absorption (RSA) within saturable absorption (SA) at low peak intensities to SA in RSA at higher peak intensities. Pc2 data recorded at similar concentration exhibited saturable absorption type of behavior at lower peak intensities. The nonlinear absorption at higher intensities was again multifarious with switching over from SA to RSA. We discuss the complicated behavior of the nonlinear absorption and nonlinear optical performance of these molecules for their potential applications.
Open aperture Z-scan data recorded for alkoxy phthalocyanine with 100Â fs pulses at 800Â nm illustrating complex nonlinear absorption behavior.
Journal: Chemical Physics Letters - Volume 464, Issues 4â6, 23 October 2008, Pages 211-215