Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 23.10: Poster

Montag, 7. März 2016, 18:15–20:30, Poster E

strong coupling of surface plasmons and whispering gallery cavity — •qi ai, domenico paone, nikolai strohfeldt, simon ristok, and harald giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, 70569 Stuttgart, Germany

A lot of research has focused on spectrally narrowing the plasmon resonance of metal nanoparticles, which could benefit the application of the localized surface plasmon resonance (LSPR) for sensing and nonlinear conversion. Here we demonstrate substantial reduction in the LSPR linewidth of an Au nanorod by depositing it onto the surface of a tapered fiber. When the taper diameter is reduced to about 1-3 μm, we observe signatures of strong coupling between the LSPR modes and the whispering gallery modes of the tapered fiber. This results in a very narrow hybrid plasmon-fiber resonance of the single Au nanorod, with a much higher quality factor (up to 300) when compared with that of an Au nanorod or an uncoated fiber with the same diameter. The strong coupling leads to a significant enhancement of the peak scattering intensity at plasmon resonance when compared to an uncoupled Au nanorod.