Asymmetric optical camouflage: tuneable reflective colour accompanied by the optical Janus effect

• 作者: Taehyun Kim Eui-Sang Yu Young-Gyu Bae Jongsu Lee In Soo Kim Seok Chung Seung-Yeol Lee Yong-Sang Ryu
• 来源期刊: 光：科学与应用（英文版）
• 年，卷（期）: 2020,（6）
• 所属期刊栏目: Original Articles
• 页码范围: 1868-1877
• 页数: 10页
• 语种: 英文

摘要

Going beyond an improved colour gamut, an asymmetric colour contrast, which depends on the viewing direction, and its ability to readily deliver information could create opportunities for a wide range of applications, such as next-generation optical switches, colour displays, and security features in anti-counterfeiting devices. Here, we propose a simple Fabry–Perot etalon architecture capable of generating viewing-direction-sensitive colour contrasts and encrypting pre-inscribed information upon immersion in particular solvents (optical camouflage). Based on the experimental verification of the theoretical modelling, we have discovered a completely new and exotic optical phenomenon involving a tuneable colour switch for viewing-direction-dependent information delivery, which we define as asymmetric optical camouflage.