Asymmetric optical camouflage: tuneable reflective colour accompanied by the optical Janus effect
- Asymmetric optical camouflage: tuneable reflective colour accompanied by the optical Janus effect
- 유용상; 김인수; 유의상; 김태현; 이종수; 배영규; 정석; 이승열
- Janus effect; Camouflage; Fabry-Perot; color control; color tuning
- Issue Date
- Light: Science and Applications
- VOL 9, 175
- 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 nextgeneration 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.
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