When Pollen Becomes a Security Feature

Researchers at Osmania University in Hyderabad, India, have developed PollenSignum, a bio-based authentication technology that combines the natural microscopic characteristics of pollen with zinc oxide (ZnO) quantum dots. The system could support anti-counterfeiting and forensic verification of banknotes, security documents and high-value products.

Developed by Dr A Vijaya Bhasker Reddy, D Nirmala and B Vijay Kumar, PollenSignum creates a dual-layer authentication marker. Pollen provides a biological signature through its distinctive size, shape and exine structure, the outer wall of the grain. The ZnO quantum dots add an optical and fluorescent signature that can be measured and verified.

A key feature is its combinatorial coding capability. The researchers established a reference library comprising 12 distinct pollen taxa, yielding 4,096 theoretically non-empty combinations. The coding possibilities could expand further by incorporating additional pollen varieties, optical signatures, and spatial positioning.