A plasmonic biosensor can detect diseased exosomes even by the naked eye. Exosomes, important indicators of health conditions, are cell-derived vesicles that are present in blood and urine. A rapid analysis by biosensors helps recognize inflammatory bowel diseases, cancer, and other diseases rapidly in order to start relevant treatments in time.

Researchers have created a new biosensor by depositing plasmonic metaparticles on a black, physical body that absorbs all incident electromagnetic radiation. A plasmon is a quantum of plasma oscillation. Plasmonic materials have been used for making objects invisible in scientific tests. They efficiently reflect and absorb light. Plasmonic materials are based on the effective polarizabilities of metallic nanostructures.

Plasmonic dipoles are famous for their strong scattering and absorption. The research group has demonstrated the as-yet unknown specular reflection and the Brewster effect of ultrafine plasmonic dipoles on a black body host.

The novel approach enables a simple and cost-effective design of a perfect colored absorber and creation of vivid interference plasmonic colors.