Direct laser writing structural color for reversible encryption and decryption in different mediums

Bin Dong, Bingrui Liu, Chao Chen, Dawei Wang, Leran Zhang, Liqun Xu, Wei Xiong, Jiawen Li, Yanlei Hu, Jiaru Chu, and Dong Wu

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Bin Dong, Bingrui Liu, Chao Chen, Dawei Wang, Leran Zhang, Liqun Xu, Wei Xiong, Jiawen Li, Yanlei Hu, Jiaru Chu, and Dong Wu, "Direct laser writing structural color for reversible encryption and decryption in different mediums," Opt. Lett. 48, 2508-2511 (2023)

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Abstract

Structural color (SC) has enormous potential for improving the visualization and identification of functional micro/nano structures for information encryption and intelligent sensing. Nevertheless, achieving the direct writing of SCs at the micro/nano scale and the change of color in response to external stimuli simultaneously is rather challenging. To this end, we directly printed woodpile structures (WSs) utilizing femtosecond laser two-photon polymerization (fs-TPP), which demonstrated obvious SCs under an optical microscope. After that, we achieved the change of SCs by transferring WSs between different mediums. Furthermore, the influence of laser power, structural parameters, and mediums on the SCs was systematically investigated, and the mechanism of SCs using the finite-difference time-domain (FDTD) method was further explored. Finally, we realized the reversible encryption and decryption of certain information. This finding holds broad application prospects in smart sensing, anti-counterfeiting tags, and advanced photonic devices.

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Supplementary Material (2)

Name	Description
Supplement 1	Updated Supplemental Document
Visualization 1	Updated Supplemental Document

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