15 October 2012 Second harmonic generation from the top of an Au-coated tip via a tapered fiber coupled microsphere resonator
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Abstract
The efficient coupling of light from a tapered fiber coupled microsphere resonator to localized surface plasmon modes of Au-coated tip was demonstrated. To verify efficient localized surface plasmon excitation at the metal tip via a tapered fiber coupled microsphere resonator, we measured second harmonic generation from the top of Au-coated tip. From the results, in spite of a weak CW excitation, we succeeded in repeatedly observing SHG from the top of the Au-coated tip via a tapered fiber coupled microsphere resonator system, which could focus the light with the coupling efficiency of about 63.2 % into the nanoscale domain of the metal tip with the effective cross section of 358.2 nm2.
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Fang Ren, Kazutaka Kitajima, Hideaki Takashima, Hideki Fujiwara, Keiji Sasaki, "Second harmonic generation from the top of an Au-coated tip via a tapered fiber coupled microsphere resonator", Proc. SPIE 8463, Nanoengineering: Fabrication, Properties, Optics, and Devices IX, 846305 (15 October 2012); doi: 10.1117/12.929437; https://doi.org/10.1117/12.929437
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