Researchers from the University at Urbana-Champaign have been developing a plasmonic sensor used for cancer detection.
The sensor can detect carcinoembryonic antigen (CEA), a cancer biomarker.
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This image shows a plasmonic nanocup metal-insulator-metal cavity design used to detect the cancer biomarker CEA. The nanocavity leads to optical energy storage which is out-coupled to the far field by a refractive index increase. Therefore, CEA binding to its immobilized antibody leads to a sensitive increase in the transmission intensity at the resonance wavelength with no spectral shift. (Credit: University of Illinois)