Single-sized phase-change metasurfaces for dynamic information multiplexing and encryption
arxiv(2024)
摘要
Optical metasurfaces empower us to manipulate the electromagnetic space and
control light propagation at the nanoscale, offering a powerful tool to achieve
modulation of light for information processing and storage. In this work, we
propose a phase-change metasurface to realize dynamic multiplexing and
encryption of near-field information. Based on the orientation degeneracy and
polarization control governed by Malus's law, we elaborately design the
orientation distribution of Sb_2S_3 meta-atoms with the same dimension to
simultaneously satisfy the amplitude modulation requirements of different
channels. Using the corresponding polarization control as decoding keys, three
different nanoprinting images can be displayed, and these multiplexed images
can be switched on and off by leveraging the reversible tunability of the
Sb_2S_3 meta-atoms between the amorphous and crystalline states. With the
unparalleled advantages of ultra-compactness, simple design strategy, high
information density and security, the proposed metasurfaces afford promising
prospects for high-end applications in ultracompact and intelligent dynamic
display, high-dense optical data storage, optical information encryption, etc.
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