J. Etxebarria-Elezgarai, Carlos Rodríguez Molinuevo, Marina Echave del Carmen, Eneko Lopez Corrillero, Ion Olaetxea Azkarate-Askatsua, M. C. Morant-Miñana, A. Seifert
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Improved plasmonic resonance by Gaussian beam shaping
This work demonstrates a novel strategy to improve the sensitivity of a prism-coupled surface plasmon resonance system by Gaussian beam shaping. Shaping of the laser beam and precise alignment of the beam waist at the metal-dielectric interface renders a collimated incident beam that leads to a stronger and sharper plasmonic resonance. In the present case, beam shaping improved the sensitivity for determining the concentration of an analyte by almost 90 %.
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