Reconfigurable Hologram Response to Liquid via the Femtosecond Laser Direct Writing of 3D Micropillars

• DOI: 10.1002/adom.202400612
• Publication Date: 2024-09-10T09:27:49Z
• Authors: Taoyong Li; Luqi Li; Lan Jiang; Peng Yi; Min Li; Songchang Li; Xibiao Li; Xiangyu Zhang; Andong Wang; Zhi Wang; Jiafang Li; Lingling Huang; Bing Han; Xiaowei Li

Abstract Reconfigurable and tunable holograms hold significant practical value in the fields of anti‐counterfeiting, optical security, information display due to their ability reprogram holographic patterns create variable visual effects. However, current encryption techniques face challenges achieving rapid encryption/decryption ensuring consistent methods. In this study, a method for producing reconfigurable hologram utilizing deformation recovery properties micropillars response liquid is demonstrated. Micron‐scale are fabricated using femtosecond laser two‐photon polymerization. By exploiting capabilities with specific pitches aspect ratios liquids, micropillar structures combined construct holograms. The encrypted pattern only readable following immersion alcohol irradiation. proposed offers facile, reversible, reusable, solution encryption, potential anti‐counterfeiting security.