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Q: Fachverband Quantenoptik und Photonik
Q 54: Nano-Optics (Single Quantum Emitters and Plasmonics)
Q 54.7: Vortrag
Donnerstag, 8. März 2018, 12:00–12:15, K 0.023
Ultranarrow Nonlinear Resonances in Hybrid Fiber-Plasmon Cavities — •Qi Ai1, Lili Gui1, Domenico Paone1, Bernd Metzger1, 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 of 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. The strong coupling leads to a significant enhancement of the peak scattering intensity at the plasmon resonance. Second-harmonic generation is boosted to typically three orders of magnitude higher conversion efficiency in comparison to that from a single uncoupled Au nanorod. Moreover, the nonlinear resonance is ultranarrow (below 10 nm), benefitting from its fundamental mode with a high quality factor. An analytical anharmonic oscillator model gives good agreement with the experimentally observed wavelength-dependent nonlinear emission. In addition, giant multi-photon photo-luminescence up to 5th order has been observed.