Abstract
Aluminum nanoparticles or nanolayers are low cost and high quality materials for plasmonic sensing. Here we systematically studied the Fano characteristics of Al nano-dolmen and achieved the continuously turning the Fano dips in visible ranges. The Fano dips were significantly changed through varying the arm length of the designed dolmen structure. To further optimize and characterize the Fano resonance of Al nano-dolmen, an intuitive coupling function is used to fit the Fano line shape. More importantly, we showed that our designed nanostructures exhibit a remarkable spectral plasmonic sensitivity to the tiny refractive index change of the local dielectric environment. The refractive index changes that we measured from 1.0 to 1.4 covered most of the ranges that induced by the general molecular bindings like single-stranded DNAs and antibody-antigens.
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