| 초록 |
In recent years, photonic crystals which are arrays of dielectric materials with one-, two-, or three-dimensional periodicity have attracted much attention from many researchers. These photonic crystals may be useful for lots of applications in photonic and optoelectronic device area. Self-assembled opal and inverse opal structures by using colloidal particles have been attempted as one of the most promising photonic band gap materials. Particularly, inverse opal structures could be modified to enhance optical properties for the complete and wide photonic band gap. Various polymer inverse opals have also been fabricated for band gap tunable photonic crystals. In this presentation, we demonstrate fabrication of azopolymer photonic crystals embedded with an epoxy-based azobenzene-functionalized polymer in self-assembled silica colloidal crystals. Inverse opal structures were prepared by the hydrofluoric acid aqueous solution treatment. When azobenzene-functionalized organic materials were exposed to the linearly polarized light, azobenzene chromophores performed the photoisomerization and photoreorientation. As azo-chromophores were reoriented by the polarized light, the azopolymer photonic crystal could show the variation of optical properties by the change of the effective refractive index. The optical property tuning by the exposure to the polarized light in these azopolymer inverse opals will be discussed. |
