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Using nanostructured waveguide surfaces via materials ranging from noble metals (e.g., gold) to graphene quantum dots gives rise to so-called surface enhanced infrared absorption (SEIRA) features, which amplify molecular signatures up to a factor of 1,000. Hence, even trace concentrations of molecular constituents may be probed via their vibrational signatures in a label-free direct assay format.
Boris Mizaikoff
"Recent advancements in surface-enhanced infrared sensing technology: from gold to graphene (Conference Presentation)", Proc. SPIE 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII, 112841T (9 March 2020); https://doi.org/10.1117/12.2549619
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Boris Mizaikoff, "Recent advancements in surface-enhanced infrared sensing technology: from gold to graphene (Conference Presentation)," Proc. SPIE 11284, Smart Photonic and Optoelectronic Integrated Circuits XXII, 112841T (9 March 2020); https://doi.org/10.1117/12.2549619