열처리와 반복코팅이 자기조립을 통해 형성된 SiO₂ 광자결정의 광특성에 미치는 영향 = Defects Healing of Self-Assembled SiO₂Photonic Crystals by Heat-Treatment and Multi-coating

다국어 초록 (Multilingual Abstract)

This study examined the effect of heat treatment and multi-coating on the microstructure and optical properties of photonic crystals that had been self assembled using monodispersed spherical SiO₂ nanoparticles. When the heat treatment temperature was increased, the reflectance peak due to the photonic band gap moved to a shorter wavelength direction, and the peak intensity of the Fabry Perot fringes increased. The highest reflectance peak intensity was obtained in the sample heat treated at 250~300℃. Heat treatment reduced the average particle size and number of defects, and increased the packing density of the photonic crystal. When the heat treatment temperatures were increased to 900℃, a large crack, whose average size is approximately 1.3 ㎛, formed through the self assembled layer. In addition, a multi-coating could effectively fill the open space of this crack and reduce the total number of defects dramatically.