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We numerically demonstrate spatiotemporal control of ultrafast localized plasmon pulses at metallic nanostructures. This results confirm that more flexible spatiotemporal control can be achieved by femtosecond laser pulses combined with wave front and pulse shaping.

Spatiotemporal nanofocusing of surface plasmon polaritons excited by femtosecond laser pulses on a tapered metallic tip with few tens nanometer radius is deterministically controlled using a measured plasmon response function.

Nanofocusing of ultrafast surface plasmon polariton pulses excited on an Au tapered tip, and the nonlinear radiation such as second harmonics and coherent anti-stokes Raman scattering are deterministically controlled based on a measured plasmon response function.

Two types of poly(ethylene glycol) (PEG)-based amphiphiles were synthesized: a diblock-type amphiphile (PEG1) with a hydrophobic moiety on one terminal of PEG (PEG with the molecular weight of 2000), and a triblock-type amphiphile (PEG2) with hydrophobic moieties on both terminals of PEG. The hydrophobic moiety consisted of hydrophobic C14 alkyl tails covalently linked through a gallamide component. The sol–gel transitions of the aqueous solution of PEG1 and PEG2 were studied. At the PEG amphiphile concentration of 15 wt %, PEG1 gave a clear solution over a wide temperature range from 20 to 80 °C, while PEG2 was partially soluble in water. However, the aqueous blend solution of PEG1 and PEG2 exhibited a hydrogel depending on the blend ratio and temperature. It was considered that the composition of PEG1 and PEG2 governed the sol–gel transition, and that the dynamic moduli could be effectively controlled by changing the mixing ratios of the PEG amphiphiles. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45402.