کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1229501 | 968734 | 2015 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Third-order nonlinear optical investigations of meso-tetrakis(2,3,5,6-tetrafluoro-N,N-dimethyl-4-anilinyl)porphyrin and its metal complexes Third-order nonlinear optical investigations of meso-tetrakis(2,3,5,6-tetrafluoro-N,N-dimethyl-4-anilinyl)porphyrin and its metal complexes](/preview/png/1229501.png)
• We examined the third order NLO properties of a series of metallo porphyrins.
• Techniques used were Z-scan and degenerate four wave mixing.
• The χ(3) values are increasing with the d-shell occupancy of central metal atoms.
• Electrostatic potential (ESP) mapping is done to know electron density changes.
• The results obtained are in accordance with the ESP plots.
We report here the experimental investigation on third-order nonlinear optical parameters of 5,10,15,20-tetrakis(2,3,5,6-tetrafluoro-N,N-dimethyl-4-anilinyl)porphyrin and its various metal complexes, using Z-scan technique at 532 nm. The third-order nonlinear optical susceptibilities (χ(3)) were of the order 10−12 esu and are compared through degenerate four wave mixing (DFWM). The operating mechanism is reverse saturable absorption (RSA) as the effective excited-state absorption cross-section was found higher than ground state absorption cross-section as well as the magnitude of nonlinear absorption coefficient was found decreasing with on-axis input intensity. The compounds found to exhibit good optical limiting at 532 nm, 7 ns excitation steering applications in laser safety.
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Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 136, Part B, 5 February 2015, Pages 838–844