Deterministic Spatiotemporal Control of Plasmon Excited by Femtosecond Laser Pulses by Plasmon Response Function

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When combining metal nanostructures supporting near-field enhancement and surface plasmon polariton (SPP) transport with ultrafast laser technologies, one can demonstrate ultimate spatiotemporal confinement of optical fields. These plasmons can be deterministically controlled by pulse shaping excitation femtosecond laser pulses based on their response functions. In this study, a spectral interferometer with scanning near-field microscopy and a cross-correlation dark-field imaging microscopy were developed to obtain plasmon response functions for local plasmon pulses excited on Au nanostructures, SPP pulse propagation in an Au plasmon waveguide, and SPP pulse nano-focusing on an Au tapered tip. Then, spatiotemporal controllability of ultrashort plasmon pulses excited by pulse shaped femtosecond laser pulses was demonstrated.