Fabrication and optical characterization of silver-coated gradient-grown anodic aluminum oxide. (24th September 2020)

• Record Type: Journal Article
• Authors: Hwang, Hee Jae; Jeong, Yeonseok; Chae, Songhwa; Choi, Dukhyun
• Is Part Of: Functional composites and structures. Volume 2:Number 3(2020)
• Publication Date: 2020-09-24
• Subjects: anodic aluminum oxide -- gradient growth -- color change -- gear-train -- interference-plasmonic coupling; Composite materials -- Periodicals; 620.118
• DOI: 10.1088/2631-6331/abb2f7
• Languages: English
• ISSNs: 2631-6331

Abstract

Abstract: Here, we introduce gradient-grown anodic aluminum oxides (G-AAO) produced using a gear-train with a ratio of 1:16 and controlling the drawing velocity during a 2nd anodization period ( t 2A ). After silver (Ag) deposition on G-AAOs, their optical behaviors are investigated as an interference-plasmonic coupling effect. First, we examine the geometrical and optical characteristics of statically grown AAO (S-AAO) on which 20 nm thick Ag is deposited. An obvious color change is found from blue ( t 2A = 30 s) to red ( t 2A = 90 s) due to an interference-plasmonic coupling. Second, we fabricate G-AAOs using a dynamic 2nd anodization with two different drawing velocities of 1.1 mm s −1 and 2.2 mm s −1 . As a result, a linear increase in thickness (about 1.23 nm s −1 ) is found in G-AAOs. After Ag deposition, a clear color change is not found but an optical red shift in absorption is observed on Ag-coated G-AAOs. Thus, our results provide the first constraints on optical behavior of a metal-coated G-AAO, with a variety of nano-optical applications.