有机无刻痕光栅的研制

Fabrication of Organic Groove-Free Gratings

通过有机合成获得了香蕉形分子化合物1,3-phenylene bis(4-methoxy-benzylidene amine)。将少量的香蕉形分子化合物夹在两块玻璃衬底之间,加热到150℃使其熔化,然后自然冷却至室温,香蕉形分子可自组装成有机无刻痕光栅。偏光显微镜分析表明,这些香蕉形分子能够在两块玻璃衬底之间通过分子自组装技术而形成平行且等间距、折射率呈周期性变化的条纹。氦氖激光衍射实验表明,香蕉形分子自组装而成的光栅与有刻痕光栅相比同样可对红光进行有效衍射。从香焦形分子的立体结构出发,探讨了香蕉形分子自组装成有机无刻痕光栅的形成机制,并导出了有机无刻痕光栅的衍射光强分布公式。

Banana-shaped compound 1,3-phenylene bis（4-methoxy-benzylidene amine） was synthesized. After a tiny amount of the synthesized banana-shaped molecules were sandwiched between two pieces of glass substrates, the molecules were able to assemble themselves into organic groove-free gratings when the banana-shaped compound was cooled in air to room temperature from its melt state at about 150 ℃. Polarizing optical microscopic characterization demonstrates that these banana-shaped molecules can assemble themselves into parallel and equidistant stripes between two pieces of glass substrates with a periodic modulation of the refractive index. He-Ne laser diffraction experiment shows that although the gratings are groove-free, the self-organized optical gratings by the banana-shaped molecules exhibit the same diffraction patterns as classically ruled gratings. From the viewpoint of the steric structure of the banana-shaped molecules, the formation mechanism of the self-assembled groove-free gratings was discussed and the diffraction equation was derived for the self-assembled groove-free gratings for the organic groove-free gratings.