Concealable Physical Unclonable Functions Based on Polarization‐Sensitive Raman Scattering

Counterfeit goods present substantial challenges to economic stability and consumer safety, with traditional anti‐counterfeiting technologies like bar codes and holograms often vulnerable to replication. In this paper, an advanced authentication method using Physical Unclonable Functions (PUFs) based on the unique polarization‐dependent Raman scattering of β ‐Ga 2 O 3 microbelts (MBs) is introduced. The study provides a comprehensive analysis of the angular dependence of Raman scattering, supported by both theoretical and experimental evidence, showcasing the potential of β ‐Ga 2 O 3 MBs for creating concealable PUFs. By integrating light polarization into the PUF design, the security and complexity of authentication systems are significantly improved. The findings demonstrate that leveraging polarization‐dependent Raman signals as concealable information can significantly bolster anti‐counterfeiting capabilities, promising a significant advancement in the development of secure authentication technologies.