Plasmonic nanofocusing on a conical metal tip has attracted much attention to achieve optical excitation in subwavelength scales. Ropers et al. demonstrated efficient localized optical excitation at the apex of a metallic taper by grating-coupled surface plasmon polaritons (SPPs) excited by femtosecond laser pulses [1]. Berweger et al. experimentally analyzed the temporal characteristics of SPPs coupled onto an Au tapered waveguide using second harmonics (SH) generated at the apex [2].

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