URBANA, Ill., Nov. 2, 2021 — A compact photonic resonator absorption microscopy (PRAM) instrument, developed by a team at the University of Illinois Urbana-Champaign, provides fast, selective detection of cancer biomarkers for diagnostics at the point of care. The instrument takes advantage of the optical coupling between plasmonic gold nanoparticle tags and a photonic crystal surface to provide the contrast users need to observe and count gold nanoparticles that are linked to proteins or other biomarkers. 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