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DF: Fachverband Dielektrische Festkörper
DF 11: Poster
DF 11.2: Poster
Mittwoch, 9. März 2016, 18:00–20:00, Poster E
Plasmon-enhanced biosensing with polymeric whispering-gallery-mode resonators — •Carolin Klusmann1, Sarah Krämmer1, Steffen A. Schmid1, Tobias Siegle1, Carsten Rockstuhl2 und Heinz Kalt1 — 1Institute of Applied Physics (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe — 2Institute of Theoretical Solid State State Physics (KIT), Wolfgang-Gaede-Straße 1, 76131 Karlsruhe
Polymeric whispering gallery mode (WGM) microresonators are very promising candidates for the label-free detection of biomolecules. They derive their unprecedented sensitivity from very high quality factors in combination with small modal volumes. By exciting plasmonic resonances in metal nanoparticles immobilized within the evanescent field of the WGMs their sensitivity can be enhanced even further. The excitation of plasmonic resonances leads to the formation of hybrid photonic-plasmonic modes within the resonator and greatly elevated field intensities at the nanoparticle site. We present simulations and first experimental results on how a sensitivity enhancement can be achieved by carefully choosing the plasmonic NP`s material, size, shape and concentration.