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We demonstrate efficient and broadband nonlinear nano-optics in plasmonic nano-focusing with nanometer localized four-wave mixing. We achieve deterministic optical control and nano-spectroscopic imaging of graphene as the basis for extension of multidimensional spectroscopy to the nanoscale.
We demonstrate broadband slow light through adiabatic nanofocusing of surface plasmon polaritons (SPPs) on a conical tip. A few femtosecond group delay for nanofocused pulses is found, corresponding to an SPP velocity of less than 0.2c at the apex of the tip.
We measure the electrical permittivity of different bulk and film gold samples by spectroscopic ellipsometry from 200 nm to 20 μm, resolving inconsistencies on plasmon resonances, lifetime, and SPP propagation associated with imprecise current literature values.
The precise characterization of the ultrafast electronic response in a metallic nanostructure is achieved using a combination of spectrogram measurement of collinear interferometric second-harmonic scattering and treatment of Frequency Resolved Optical Gating (FROG). The plasmon dephasing dynamics have been resolved with multiple time-scales.
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