Studies on thin film materials on acrylics for optical applications

Bulletin of materials science

K Narasimha Rao¹ 

[1] Department of Instrumentation, Indian Institute of Science, Bangalore 560 012, India$$Department of Instrumentation, Indian Institute of Science, Bangalore 560 012, IndiaDepartment of Instrumentation, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Coatings on acrylics;    dielectric thin films;    optical coatings;    low temperature coatings;    oxide films;    antireflection coatings.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Deposition of durable thin film coatings by vacuum evaporation on acrylic substrates for optical applications is a challenging job. Films crack upon deposition due to internal stresses and leads to performance degradation. In this investigation, we report the preparation and characterization of single and multi-layer films of TiO₂, CeO₂, Substance2 (E Merck, Germany), Al₂O₃, SiO₂ and MgF₂ by electron beam evaporation on both glass and PMMA substrates. Optical micrographs taken on single layer films deposited on PMMA substrates did not reveal any cracks. Cracks in films were observed on PMMA substrates when the substrate temperature exceeded 80°C. Antireflection coatings of 3 and 4 layers have been deposited and characterized. Antireflection coatings made on PMMA substrate using Substance2 (H2) and SiO₂ combination showed very fine cracks when observed under microscope. Optical performance of the coatings has been explained with the help of optical micrographs.

【 授权许可】

Unknown