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物理学报. 2006, 55(7): 3736-3742.
doi: 10.7498/aps.55.3736.
可溶性聚噻吩甲烯包覆碳纳米管的三阶非线性光学响应
- 收稿日期: 2005-10-17
- 修回日期: 2005-12-12
- 刊出日期: 2006-07-20
English Abstract
Third-order nonlinear response of conjugated polymer coated carbon nanotubes
- Received Date:
17 October 2005
- Accepted Date:
12 December 2005
- Published Online:
20 July 2006
Abstract: Carbon nanotubes coated with an nonlinear optical (NLO) polymer, poly［3-hexylthiophene-2,5-diyl］-［3-methoxyl-4-hydroxyl-benzylidenequino-methane］(PHTHMOBQ/MWNTs), were synthesizedvia in-situ polymerization. The micrograph of PHTHMOBQ/MWNTs has the coaxial tubular structure, which indicated that the polymer was restricted and wrapped on the surface of carbon nanotubes while propagating during polymerization. PHTHMOBQ/MWNTs showed fluorescence quenching, which involved the inter-molecular photo-induced charge transfer process. Third-order nonlinear susceptibility χ(3) and second-order hyperpolarizability γ of PHTHMOBQ/MWNTs were measured using degenerate four wave mixing at 532nm under nanosecond pulse excitation. The two pump beams were vertically polarized and the probe beam was horizontally polarized to avoid thermal effect. The third-order NLO responses were enhanced gradually when nanotube content increased, which was attributed to inter-molecular photo-induced electron transfer between PHTHMOBQ and MWNTs.
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