We present calculations on the implementation of attosecond nanoplasmonic streaking (APS) spectroscopy on
isolated nanoparticles. APS spectroscopy might enable a remote measurement of plasmonic field oscillations in the optical regime with sub-cycle temporal resolution, where plasmons are excited by a few-cycle near-infrared (NIR) driving field and the associated near-fields are mapped by the energy of photoemitted electrons using a synchronized, time-delayed attosecond extreme ultraviolet (XUV) pulse. We discuss the influence of the near-field spatial distribution and electron kinetic energy on the streaking process. By numerical simulations we show the feasibility of APS spectroscopy using Au nanospheres with 10 nm and 100 nm diameter. We show that the
near-elds around the nanoparticles can be spatiotemporally reconstructed and may give detailed insight into
the build-up and decay of collective electron motion.
An Yb-based 78-MHz repetition rate fiber-amplified frequency comb is used to investigate the power scaling
limitations of a standard-design bow tie high-finesse enhancement cavity for XUV generation. With a Xenon
gas jet in the 22-μm-radius focus, the 200-fs intra-cavity circulating pulse reaches a maximum of 20 kW of time-averaged
power. A novel cavity design is presented, conceived to overcome the observed enhancement limitations
and offering the prospect of few-nm high-power high-harmonic generation. Several applications which come into
reach for the first time are discussed.
We present a systematic investigation into the conditions required for the production of XUV light via nanoplasmonic
enhanced high harmonic generation in metallic spheroids. Control over the temporal response of the plasmonic fields,
and therefore the resulting XUV radiation, is achieved through the nanostructure configuration and the carrier envelope
phase of the driving laser pulse. Coupled symmetric structures are shown to produce sufficient localized field
enhancement and relatively long exponential plasmon decay times leading to the characteristic high harmonic spectra. In
contrast coupled asymmetric structures have a much broader resonance and a highly non-uniform plasmon response in
the temporal domain.