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Journals and Conferences
As an efficient nanolens, we propose a self-similar linear chain of several metal nanospheres with progressively decreasing sizes and separations. To describe such systems, we develop the multipole spectral expansion method. Optically excited, such a nanolens develops the nanofocus ("hottest spot") in the gap between the smallest nanospheres, where the… (More)
The promise of ultrafast light-field-driven electronic nanocircuits has stimulated the development of the new research field of attosecond nanophysics. An essential prerequisite for advancing this new area is the ability to characterize optical near fields from light interaction with nanostructures, with sub-cycle resolution. Here we experimentally… (More)
Surface plasmon polaritons are a central concept in nanoplasmonics and have been exploited to develop ultrasensitive chemical detection platforms, as well as imaging and spectroscopic techniques at the nanoscale. Surface plasmons can decay to form highly energetic (or hot) electrons in a process that is usually thought to be parasitic for applications,… (More)
We theoretically show that two-photon coherent control yields electron photoemission from metal nanostructures localized in nano-size hot spots whose positions are controllable on nanometer scale, in agreement with recent experiments. We propose to use silver V-shapes as tailored nanoantennas for which the position of the coherently-controllable… (More)
Application of nanosystems in the ultrafast regime requires control of nanoscopic fields on sub-cycle timescales . Waveform controlled few-cycle laser pulses in the visible have proven to be a powerful tool to steer electron dynamics on a sub-femtosecond time scale in atoms  and molecules . One of the most promising routes to the realization of… (More)
We predict and theoretically investigate the unique possibility to control distribution of ultrafast local optical fields in nanosystems in space with nanometer resolution and in time on the femtosecond scale. While the spatial degrees of freedom of the optical radiation do not allow focusing of the light on nanoscale, the temporal degrees of freedom, i.e.,… (More)
We study amplitude and phase responses of individual gold nanoparticles and nanoparticle dimers by applying near-field illumination with a bright, broad-band, femtosecond, white-light continuum.
We make a step towards quantum nanoplasmonics: surface plasmon fields of a nanosystem are quantized and their stimulated emission is considered. We introduce SPASER, a quantum generator for surface plasmon quanta. Spaser is predicted to generate ultrafast (10 to 100 fs duration), temporally coherent, near-atomic intensity fields of surface plasmon modes… (More)
We predict that surface plasmon polaritons propagating toward the tip of a tapered plasmonic waveguide are slowed down and asymptotically stopped when they tend to the tip, never actually reaching it (the travel time to the tip is logarithmically divergent). This phenomenon causes accumulation of energy and giant local fields at the tip. There are various… (More)
We show with simulations that ultrafast electron diffraction can provide snapshots of charge-density evolution in condensed matter with few-femtosecond and sub-atomic resolutions. Using graphene as an example, we discuss real-space aspects of light-matter interaction.