Research on the Uuniversal Omnidirectional Antireflection in the Visible Spectral Region

• Main Authors: En-Wei Chang, 張恩瑋
• Other Authors: Yeuh-Yeong Liou
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/94977874808784107078

碩士 === 建國科技大學 === 電子工程系暨研究所 === 103 === Antireflection (AR) coating has been widely used in various optical systems for reducing the reflection loss of optical devices or increasing the transmittance of optical system. As there are a few different substrates need to be AR coated, and if one can design a universal AR design, then different substrates can be AR coated in the same deposition run simultaneously. Therefore, the coating material, deposition time, electrical power and main power thus can be considerably saved to reduce the cost of coatings. In this study, an iterative jumping search algorithm was applied to design the omnidirectional visible antireflection for a set of eight commonly used glass substrates with refractive indices ranging in 1.472-1.800. We found that the optimal omnidirectional antireflective effect can be obtained when a wide-angle antireflection was designed in the range of 0–49°. And the average visible reflectivity in the range 0–90°was reduced to 11.41% from the uncoated substrates of 18.02%, whereas in the design range of 0–49° the average reflectivity was reduced to 0.47% from 6.28% (uncoated substrates). Furthermore, the omnidirectional visible antireflective coating was implemented utilizing the ion-assisted deposition (IAD) technique, and the measured coating performance was consistent to that of the omnidirectional visible antireflective design.