Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 29, Issue 40, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201903743
Keywords
bilayer; encryption; photonic crystals; response; transparency
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Funding
- State Key Program of the National Natural Science Foundation of China [21536002]
- Science Fund for Creative Research Groups of the National Natural Science Foundation of China [21421005]
- Ministry of Education (Ministry of Education Innovation Team) [IRT-13R06]
- Dalian University of Technology (Dalian University of Technology Innovative Research Team) [DUT2013TB07]
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Combining functional response materials into colloidal photonic crystals is an accepted encryption strategy for information security. Here, bilayer inverse heterostructure photonic crystals that enable instantaneously transparentizing of the top layer and simultaneously releasing the reflected light of the bottom layer when exposed to ethanol are reported. The transition can quickly return to its original state after the evaporation of ethanol. In addition, the bilayer film is responsive to water, which shows redshift of the bandgap position. The mechanism of the design involves optical scattering and diffraction in the fabricated periodic nanostructures and uses the infiltration and capillary evaporation of fluids with low surface tension to realize the spectral diversity of reflectance. The effects of scattering and color superposition of the upper layer can be obliterated and re-established for the fact of the infiltration and capillary evaporation of fluids with low surface tension; meanwhile, it provisionally displays the pattern of the bottom layer. Multiple reversible ways to hide and display information could be easily realized by these characteristics. Reconfigurable bilayer inverse heterostructure photonic crystals simultaneously provide a simple and sensitive optical technique for investigating the intriguing encryption effects at the nanoscale.
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