| Autor: |
Douglas, William E., Benfield, Robert E., Antipov, Oleg L., Klapshina, Larisa G., Kuzhelev, Alexander S., Guy, Daniel M. H., Jones, Richard G., Mustafa, Alkay, Domrachev, George A. |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); July 21, 2000, Vol. 2 Issue: 14 p3195-3201, 7p |
| Abstrakt: |
The third-order optical nonlinearities of a series of conjugated poly[(arylene)(ethynylene)silylene]s, and also of a complementary series of poly[(arylene)silylene] statistical copolymers without acetylene groups, have been studied in chloroform solution by using the degenerate four-wave mixing technique with a Q-switched Nd:YAG laseroscillator at 1064 nm and a pulse duration of ca. 6 ns. The polymers contain a variety of arylene groups including carbazole and anthracene. The electronic and nuclear contributions of the χ(3) susceptibility and the thermal nonlinearity of the solutions were separated. The χ(3) susceptibilities of some poly[(arylene)(ethynylene)silylene]s were found to be as high as ∣Re χ(3)∣=0.95×10-10 esu for solutions of concentration 50 g l-1. The results show that the presence of a single 8-(dimethylamino)naphthyl ligand at silicon affording pentacoordination has a beneficial effect on the χ(3) properties. Comparison of the results for the poly[(arylene)silylene]s with those for the poly[(arylene)(ethynylene)silylene]s suggests that the absence of acetylene groups in the former case has in general a deleterious effect on the χ(3) properties. Confirmation of the order of magnitude of the non-linear response has been confirmed by Z-scan measurements with picosecond laser pulses on hybrid solgel silica films of two of the poly[(arylene)(ethynylene)silylene]s containing arylene amide groups. |
| Databáze: |
Supplemental Index |
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