987 research outputs found
Strong-Field Perspective on High-Harmonic Radiation from Bulk Solids
Mechanisms of high-harmonic generation from crystals are described by
treating the electric field of a laser as a quasi-static strong field. Under
the quasi-static electric field, electrons in periodic potentials form dressed
states, known as Wannier-Stark states. The energy differences between the
dressed states determine the frequencies of the radiation. The radiation yield
is determined by the magnitudes of the inter-band and intra-band current matrix
elements between the dressed states. The generation of attosecond pulses from
solids is predicted. Ramifications for strong-field physics are discussed.Comment: 5 pages, 2 figure
Giant Surface Plasmon Induced Drag Effect (SPIDEr) in Metal Nanowires
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 10^5-10^6 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.Comment: 5 pages, 3 figure
Spaser Action, Loss Compensation, and Stability in Plasmonic Systems with Gain
We demonstrate that the conditions of spaser generation and the full loss
compensation in a resonant plasmonic-gain medium (metamaterial) are identical.
Consequently, attempting the full compensation or overcompensation of losses by
gain will lead to instability and a transition to a spaser state. This will
limit (clamp) the inversion and lead to the limitation on the maximum loss
compensation achievable. The criterion of the loss overcompensation, leading to
the instability and spasing, is given in a analytical and universal
(independent from system's geometry) form.Comment: 4 pages, 1 figur
Toward Full Spatio-Temporal Control on the Nanoscale
We introduce an approach to implement full coherent control on nanometer
length scales. It is based on spatio-temporal modulation of the surface plasmon
polariton (SPP) fields at the thick edge of a nanowedge. The SPP wavepackets
propagating toward the sharp edge of this nanowedge are compressed and
adiabatically concentrated at a nanofocus, forming an ultrashort pulse of local
fields. The one-dimensional spatial profile and temporal waveform of this pulse
are completely coherently controlled.Comment: 4 pages, 3 figures Figures were replace
- …