Nonlinear optical properties of X-type chromophores and their doped films
Li, SJ; Yang, Z; Ye, C
AbstractTwo X-type chromophores, 2-[4-(4,5-di(4-nitrophenyl) imidazolyl) phenyl)-4,5-di(4-methoxyphenyl)-imidazole (DNPIPDMOPI), 2-[4-(4,5-di(4-nitrophenyl)-imidazolyl) phenyl]-4,5-di(4-aminophenyl)-imidazole (DNPIPDAPI), were synthesized and characterized. The results show that they possess good nonlinearity, considerable blue-shifted absorption (385 nm and 379 nm in THF) and high decomposition temperature (377degreesC and 405degreesC). These mean that the X-type chromophores possess a rather good nonlinearity-transparency-thermal stability trade-off. The multi-step corona-poling technique at elevated temperature and in-situ SHG measurements were used to obtain and evaluate the poled films of these chromophores doped in PMMA. The largest SHG signals appeared at 110-120degreesC, which are 12.5 pm/V and 16.7 pm/V respectively. The dependence of poling induced orientation stability on temperature was measured by depoling experiments and the results indicate that the poling-induced orientation of the films is stable at about 100 C. Theoretic analyses imply that better orientation stability arises from the X-type structure of chromophore. The X-type chromophore has two crossed intramolecular CT, both beta(xxx) and beta(xyy) can contribute to the second-order susceptibility, and the ratio of the tensorial components (y =beta(xyy)/beta(xxx)) is about 1/3, so the orientation decay of the films induced by rising temperature will provide a certain compensation for the contribution of beta(xyy) of chromophores.
KeywordNonlinear Optical X-type Chromophore
Indexed BySCI
WOS IDWOS:000224529000007
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Document Type期刊论文
Corresponding AuthorYe, C
AffiliationChinese Acad Sci, Ctr Mol Sci, Organ Solids Lab, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Li, SJ,Yang, Z,Ye, C. Nonlinear optical properties of X-type chromophores and their doped films[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2004,22(5):453-457.
APA Li, SJ,Yang, Z,&Ye, C.(2004).Nonlinear optical properties of X-type chromophores and their doped films.CHINESE JOURNAL OF POLYMER SCIENCE,22(5),453-457.
MLA Li, SJ,et al."Nonlinear optical properties of X-type chromophores and their doped films".CHINESE JOURNAL OF POLYMER SCIENCE 22.5(2004):453-457.
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