Spatiotemporal nanofocusing of surface plasmon polaritons excited by femtosecond laser pulses on an Au taper with a tip radius of few tens of nanometer is deterministically controlled. In addition, we control nonlinear radiation such as second harmonics (SH) and coherent anti-stokes Raman scattering (CARS) at the apex of the tip by shaping the excitation femtosecond laser pulses.

© 2015 Optical Society of America

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