Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 50: Plasmonics and Nanooptics V

O 50.6: Vortrag

Mittwoch, 16. März 2011, 16:15–16:30, WIL A317

Cavity-enhanced localized plasmonic resonance sensing — •Ralf Ameling, Lutz Langguth, Mario Hentschel, Martin Mesch, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

We present a method to enhance the sensing properties of a localized plasmon resonance sensor. The concept is based on the combination of localized plasmons in nanostructures and a photonic microcavity. Metal nanorods that are placed at Bragg distance above a metal mirror form a Fabry-Pérot microcavity and constitute a coupled photonic-plasmonic system. The localized plasmon resonances of the nanorods and the phase shifts upon plasmon excitation are extremely sensitive to changes of the refractive index of the material surrounding the nanorods. Compared to the plasmonic nanorods alone, the coupled photonic-plasmonic system allows for a much more sensitive detection of small refractive index changes. We experimentally demonstrate our method with water and glucose solution. Our concept can be applied to many localized plasmonic sensor structures (e.g., colloidal systems such as nanostars) and will considerably increase their sensing properties. Potential applications in the fields of biotechnology, medical diagnostics, or pharmacology including biomolecule detection as well as real-time monitoring of chemical reactions or molecular kinetics might benefit from this concept.