am9b21947_si_007.mp4 (3.82 MB)
Rotational Periodicity Display of the Tunable Wettability Pattern in a Photoswitch Based on a Response Bilayer Photonic Crystal
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posted on 2020-02-17, 16:11 authored by Yong Qi, Wenbin Niu, Shufen Zhang, Zhongjian Zhang, Suli Wu, Wei MaAlthough
the forward diffraction of the three-dimensional (3D)
photonic crystal is easily applied to a photoswitch, backward diffraction
rainbows are rarely reported. The first rotational photoswitch based
on a bilayer 3D photonic crystal with backward diffractions similar
to those of two-dimensional photonic crystals was fabricated by vertically
combining different thicknesses
of nanoparticle templates. When rotating the bilayer photonic crystal,
the opening or closing of the rotational photoswitch shows periodic
reproducibility values of 30 and 60°. Different periods are regulated
by the thickness and scattering effect of the top layer. Moreover,
invisible patterns can be encoded and erased by changing the wettability
via pH. Because of the decreasing of the refractive index differentials,
it will be revealed rapidly when immersed in water. The revealed pattern
can be periodically turned on and off by rotating the bilayer photonic
crystal. It has great application prospects in optical prism, warning
board, anti-counterfeiting, steganography, watermarking, and complex
information coding.
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reproducibility valuesphotoswitchwarning boardnanoparticle templatesindex differentialsthicknessResponse Bilayer Photonic CrystalRotational Periodicity Displaydiffraction rainbowspatternbilayer photonic crystalbilayer 3 D photonic crystalapplication prospectsphotonic crystalsinformation codingTunable Wettability Patternphotonic crystal