Plasmonics is promising for future electronics as it can combine optical speed of operation with nanoscale size, something which is not possible with traditional optics and electronics . Coupling of photons, plasmonic excitations and electrons is of key importance as it provides opportunities to monitor or control plasmonic nanocircuits electrically.
In this Letter we develop a theory of spoof plasmons propagating on real metals perforated with planar periodic
grooves. Deviation from the spoof plasmons on perfect conductor due to finite skin depth has been analytically
described. This allowed us to investigate important propagation characteristics of spoof plasmons such as quality
factor and propagation length as the function of the geometrical parameters of the structure. We have also
considered THz field confinement by adiabatic increase of the depth of the grooves. It is shown that the finite skin
depth limits the propagation length of spoof plasmons as well as a possibility to localize THz field. Geometrical
parameters of the structure are found which provide optimal guiding and localization of THz energy.
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.
Here, we establish the principal limits for the nanoconcentration of the THz radiation in metal/dielectric waveguides
and determine their optimum shapes required for this nanoconcentration. We predict that the adiabatic
compression of THz radiation from the initial spot size of <i>R</i><sub>0</sub> ~ λ<sub>0</sub> to the final size of <i>R</i> = 100 - 250 nm
can be achieved with the THz radiation intensity increased by a factor of ×10 to ×250. This THz energy
nanoconcentration will not only improve the spatial resolution and increase the signal/noise ratio for the THz
imaging and spectroscopy, but in combination with the recently developed sources of powerful THz pulses will
allow the observation of nonlinear THz effects and a carrying out a variety of nonlinear spectroscopies (such as
two-dimensional spectroscopy), which are highly informative. This will find a wide spectrum of applications in
science, engineering, biomedical research, environmental monitoring.
Here, for the first time we predict a giant surface plasmon-induced drag effect (SPIDEr), which exists under
conditions of the extreme nanoplasmonic confinement. Under realistic conditions, in nanowires, this giant SPIDEr
generates rectified THz potential differences up to 10 V and extremely strong electric fields up to ~ 10<sup>5</sup> ~ 10<sup>6</sup>
V/cm. The SPIDEr is an ultrafast effect whose bandwidth for nanometric wires is ~ 20 THz. The giant SPIDEr
opens up a new field of ultraintense THz nanooptics with wide potential applications in nanotechnology and
nanoscience, including microelectronics, nanoplasmonics, and biomedicine.
In this paper we propose a general and powerful theory of the plasmonic enhancement of the many-body phenomena
resulting in a closed expression for the surface plasmon-dressed Coulomb interaction. We illustrate this
theory by computing dressed interaction explicitly for an important example of metal-dielectric nanoshells which
exhibits a rich resonant behavior in magnitude and phase. This interaction is used to describe the nanoplasmonic-enhanced
F¨orster resonant energy transfer (FRET) between nanocrystal quantum dots near a nanoshell.