Femtosecond laser maskless direct writing of dual-band crosstalk-free information for all-in-one high-security encryption metasurface
用于一体化高安全加密超表面的飞秒激光无掩模直写双波段无串扰信息
フェムト秒レーザーによるマスクレス直接記写技術を用いたデュアルバンドクロストークフリー情報のワンストップ高セキュリティ暗号化メタサーフェス
펨토초 레이저 무마스크 직접 기술을 이용한 듀얼 밴드 크로스토크 없는 정보의 일체형 고보안 암호화 메타표면
Escritura directa sin máscara con láser de femtosegundos para información de doble banda sin interferencias cruzadas en metasuperficies de cifrado de alta seguridad todo en uno
Écriture directe sans masque par laser femtoseconde de données à double bande sans interférence croisée pour métasurface de cryptage haute sécurité tout-en-un
Фемтосекундная лазерная написание без шаблона для двойного диапазона без перекрестных помех информации в одном устройстве для высокозащищенной метаповерхности шифрования
Hanmian Jiang ¹, Zhuguo Li ¹ ², Dongshi Zhang ¹
¹ Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
中国 上海 上海交通大学材料科学与工程学院 激光制造与材料改性重点实验室
² State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
中国 上海 上海交通大学材料科学与工程学院 金属复合材料全国重点实验室
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 °C for smartphone-readable information decryption.
Furthermore, the visible information is both erasable through 300 °C 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 micro/nanostructuring 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.
