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Femtosecond laser maskless direct writing of dual-band crosstalkfree information for all-in-one high-security encryption metasurface 认领 引用
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作者 Hanmian Jiang Zhuguo Li Dongshi Zhang 《Opto-Electronic Advances》 SCIE EI CAS CSCD 2026年第4期59-74,共16页
Metasurface fabrication still faces critical processing challenges in balancing the structural order and disorder, achieving high-speed patterning, and extending material compatibility to refractory metals for operati... Metasurface fabrication still faces critical processing challenges in balancing the structural order and disorder, achieving high-speed patterning, and extending material compatibility to refractory metals for operation under extreme conditions. This study demonstrates that femtosecond laser maskless direct writing(fs-LMDW) offers a versatile platform for engineering multispectral information, all-in-one metasurfaces on pure zirconium(Zr)substrates. Through sequential fs-LMDW in air and ethylene glycol(EG), deceptive grey-colored visible information is superimposedly encoded with the infrared(IR)-encrypted information(invisible among black-color structured background), which leverages the crosstalk-free structural modulation of singular-band IR and visible light. The metasurface exhibits robust thermal stability and high-security encryption capability across a wide temperature range, with IR-concealed information(such as QR code) remaining securely encrypted until thermally activated at 300℃ for smartphone-readable information decryption. Furthermore, the visible information is both erasable through 300℃ oxidation heating in air and rewritable via fs-LMDW in EG without compromising IR encryption security. Particularly,the one-time complete erasability makes it possible to identify whether the encrypted IR-information has been decrypted, underscoring the robustness and high security of the platform. The presented hierarchical microanostructuring methodology is deemed to be applicable to a large material matrix to gain high-security, and multifunctional metasurfaces that are more difficult and complex for current metasurface fabrication techniques. 展开更多
关键词 all-in-one metasurface femtosecond laser maskless direct writing high-security encryption temperaturecontrolled decryption erasability and rewritability
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