期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 20, 期 23, 页码 4905-4909出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm00012d
关键词
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资金
- NSF (USA) [OII-0539835, IIP-0646460]
- CIDYT-FEDER of Spain-EU [MAT2009-14636-C03]
- Basque Government
This contribution describes the analysis of experimental results on second harmonic generation (SHG) in a novel laterally azo-bridged H-shaped ferroelectric liquid crystal (FLC) 2, incorporating a disperse red 1 (DR-1) chromophore along the FLC polar axis, and its two mixtures with a laterally azo-bridged H-shaped FLC host 1, incorporating an azobenzene chromophore. The largest d(ij) coefficient at the fundamental wavelength of lambda - 1.6 mu m is d(22) - 4.5 pm/V, the coefficient along the polar axis that is optimized from the viewpoint of the chemical design of NLO FLC molecules. A linear dependence of d(22) on the mole fractions of 2 in mixtures has been found, indicating that i) both 1 and 2 have a similar degree of polar order, and ii) dipole-dipole interaction in the DR-1 chromophore of 2 is not strong due to low chromophore density. This work highlights the importance of synthetic tailorability of FLC materials with extra functionality to second-order nonlinear optics applications.
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