Strategy for steganography and information encryption–decryption using Fs laser-created luminescence in organic solids

post-exposure to linearly polarized continuous-wave (CW) laser. This method enables hierarchical two-level information storage: level-1 information is inscribed by creating PL in an organic substrate using fs laser direct writing, while level-2 information is concealed and encrypted through polarization-dependent excitation anisotropy in PL, which arises from polarization-selective bleaching of asymmetric luminophores induced by linearly polarized CW laser exposure. This technique not only allows polarization-based encoding, but also enhances security against brute-force attacks and reduces susceptibility to the environment. Validated across three different organic materials, with detailed results presented for Zeonex polymer, this method not only demonstrates its effectiveness but also suggests a versatile and universal approach for advancing IEDAC technology in the field of information security.