Study on nonlinear optical properties of two novel dmit2− salts by Z-scan technique
✍ Scribed by Xiang-Bing Sun; Yan-Ling Wang; Quan Ren; Fu-jun Zhang; Yi Gao; Hong-Liang Yang; Lin Feng; Xin-Qiang Wang; Dong Xu
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 184 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0925-3467
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✦ Synopsis
Two novel dmit 2À salts: [C 16 H 33 (CH 3 ) 3 N]Co(dmit) 2 and [C 16 H 33 (CH 3 ) 3 N]Ni(dmit) 2 (abbreviated as CTCo and CTNi, respectively, and dmit 2À = 4,5-dithiolate-1,3-dithiole-2-thione), are synthesized and their third-order optical nonlinearities of the acetone solutions are investigated using Z-scan technique with 40 ps pulse width at 1064 nm. The Z-scan spectra reveal both CTCo and CTNi sample solutions possess large negative nonlinear refraction, exhibiting a self-defocusing effect. In addition, slight two-photo absorption and strong saturable absorption have been found in CTCo and CTNi, respectively. The molecular second-order hyperpolarizability c eff of the CTNi molecule was estimated to be as high as (À4.6 ± 0.2) • 10 À30 esu, which was four times larger than that of CTCo. An explanation for this enhancement is given. All the results suggest that these materials may have potential applications in the field of nonlinear optics.