期刊
NANOPHOTONICS
卷 9, 期 4, 页码 905-912出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2019-0519
关键词
hybrid metasurfaces; active modulation; holographic encryption
资金
- Beijing Outstanding Young Scientist Program [BJJWZYJH01201910007022]
- National Natural Science Foundation of China program [61775019]
- Beijing Municipal Natural Science Foundation [4172057]
- Beijing Nova Program [Z171100001117047]
- Fok Ying-Tong Education Foundation of China [161009]
Metasurfaces are planar devices containing delicately designed nanoantenna or resonator arrays that allow for beam shaping, super resolution imaging, and holography. Hybrid metasurface - by integrating with tunable materials such as two-dimensional materials and phase change materials (PCMs) - provides a potential platform for active modulation of wavefronts. Specifically, PCMs can flexibly switch between crystalline and amorphous states with nonvolatile property under external stimuli and provide a large refractive permittivity contrast. Using metasurfaces based on PCM to manipulate wavefronts may provide new opportunities for switchable functionalities. Here, we propose two types of metasurface devices based on whole PCM films to realize switchable holography and simultaneous phase and interference encryption. This feature can be used to encrypt information in a switched state and store camouflage information in the other state by simply applying external thermal stimuli to the entire metasurface. This method can be applied in areas such as beam shaping, optical encryption, and anti-counterfeiting.
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