Dresden 2017 – scientific programme
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O: Fachverband Oberflächenphysik
O 33: Nanostructures at Surfaces: Metals, Oxides and Semiconductors I
O 33.5: Talk
Tuesday, March 21, 2017, 11:30–11:45, REC/PHY C213
Ultranarrow Nonlinear Resonances in Hybrid Fiber-Plasmon Cavities — •Qi Ai1, Domenico Paone1, Martin Mayer2, and Harald Giessen1 — 14th Physics Institute and Research Center SCOPE, University of Stuttgart, Germany — 2Leibniz Institute of Polymer Research Dresden, Department of Physical Chemistry and Polymer Physics, Germany
We demonstrate substantial reduction in the LSPR linewidth of an Au nanorod by depositing it onto the surface of a tapered fiber. When the tapered diameter is reduced to about 1-3 **m, 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 Q (up to 300) when compared with that of an Au nanorod or an uncoated fiber with the same diameter. Meanwhile, the strong coupling leads to a significant enhancement of the peak scattering intensity at plasmon resonance when compared to an uncoupled Au nanorod. Nonlinear optical processes such as second-harmonic generation can therefore be produced from such a simple system with extremely high conversion efficiency, as it should theoretically scale with Q4. Moreover, we observed ultranarrow (linewidth < 10nm) nonlinear resonances in the second harmonic spectrum of this coupled hybrid system.