Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 9: Poster Session
DF 9.8: Poster
Dienstag, 21. März 2017, 14:00–16:00, P1C
Studying the interplay of plasmonic nanoparticles and polymeric whispering gallery mode resonators using a generalized Mie theory — •Carolin Klusmann1, Steffen A. Schmid1,2, Radius N. Suryadharma2, Carsten Rockstuhl2, and Heinz Kalt1 — 1Insitute of Applied Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2Institute of Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
Whispering gallery mode (WGM) resonators build a promising platform for sensing applications due to their high quality factors in combination with small modal volumes. Coupling plasmonic nanoparticles to WGM resonators has recently been suggested to further improve their sensitivity by utilizing local field enhancements around metallic nanoparticles immobilized within the evanescent field of the WGM. However, the underlying physical mechanism is not fully understood yet. Using generalized Mie theory we theoretically analyze the interplay between spherical WGM resonators and plasmonic nanoparticles to provide a deeper understanding of the physical properties of such hybrid systems. We show that the wavelength-detuning between plasmonic resonance and WGM plays a crucial role in the coupling process and deduce engineering guidelines to enhance the sensitivity of such systems.