Optical effect of TiO2 thin film coating on silica opal photonic crystal

• Main Authors: Yang, Sheng-Hung, 楊勝鈜
• Other Authors: Kan, Hung-Chih
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/w22x9g

碩士 === 國立中正大學 === 物理系研究所 === 107 === We fabricated self-assembled SiO2 opal photonic crystals and deposited TiO2 films with different thickness on their surfaces. We characterized the optical properties of the opal with angularly resolved reflection spectra. We found that besides the reflection peaks resulted from the photonic stop band of the opal in the (111) direction of the face-centered cubic crystalline, we also observed anomalous peaks in shorter wavelength range. Then we investigate their behaviors as a function of TiO2 film thickness, and we found that these reflection peaks behave like Wood’s anomaly that results from the guided mode resonance of the incident light with the corrugated TiO2 films conformed to the opal structure.