| 초록 |
Organics showing second-order nonlinear optical(NLO) properties have been extensively studied for applications in photonic devices, such as frequency doubling and electro-optical(EO) modulation, because of their large optical nonlinearity, excellent processibility, and low dielectric constant. However, NLO chromophore in organic/inorganic matrixes is easily randomized under the absence of poling field. In the previous work, we have studied the liquid crystal effect on poling behaviour of NLO chromophore dispersed in organic/inorganic hybrid sol-gel materials with addition of 30 wt% (LC + NLO chromophore) in I/O matrix, and found that UV-Vis absorption spectra for LC and NLO chromophore mixture system were relatively more decreased after poling. Thus, it was expected that co-doping of liquid crystal with NLO chlomophore in I/O matrix would increase the electro-optic coefficient(r33). In this studies, we report the optical properties of NLO chromophore co-doped with LC in I/O matrix. For inorganic-organic hybrid matix, 3-glycidoxypropyltrimethoxysilane(GPTMS) and tetraethoxysilane(TEOS) were used as starting materials, followed by conventional sol-gel process. After curing the hybrids deposited on transparent ITO-coated glasses, electric field was employed to orient the poling. |
