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By combining analytical and numerical approaches, we study resonantly enhanced second-harmonic (SH) generation by individual high-index dielectric nanoparticles made of centrosymmetric materials. Considering both bulk and surface nonlinearities, we describe second-harmonic nonlinear scattering from a silicon nanoparticle optically excited in the vicinity of the magnetic and electric dipole resonance...
We develop the asymptotic theory of third-harmonic generation from silicon nanoparticles driven by optically-induced Mie resonances and analyze the multipolar nature of the generated electromagnetic fields. We propose the approaches for directing the resonantly enhanced nonlinear scattering by spherical and disk-shaped particles, excited in the vicinity of the magnetic dipolar resonance. Our analytical...
The second harmonic generation and two-photon luminescence from a colloidal solution of spherical gold nanoparticles at wavelength tuning of exciting radiation is studied in experiments. The measured polarization and spectral characteristics of the second harmonic and two-photon luminescence demonstrate that the observed nonlinear optical response is determined by the dimers that constitute several...
We numerically simulated two-photon luminescence at the near-filed interaction of a gold nanoparticle and a conductive atomic-force microscope tip (AFM) using FDTD calculation of electric field distribution. Comparison of the results of numerical simulation with the experimental data [1] gives information on the shape and orientation of the nanoparticles with a resolution surpassing that of conventional...
The self-action effects of the laser radiation incident on metal nanoparticles of spherical shape are analyzed within the framework of a free-electron model and a phenomenological description of the nonlinear electrodynamic properties of the metal surface. Analytical expressions are obtained for the nonlinear addition to the field-induced dipole moment of a nanoparticle at the fundamental frequency...
We study the initiation of a pulsed microwave discharge in atmospheric air by a plasma channel induced by intense femtosecond laser pulses. It is shown that the electric field threshold for the initiated discharge is lowered compared with the self-discharge by about a factor of two, from 25 to 12 kV·cm−1. Channelling of the atmospheric-pressure microwave discharge in the direction of the plasma filament...
We introduce a concept of resonant tunneling photonic nanotransistor which makes possible mutual control of cross-cut light flows. The idea of this concept is based upon strong resonant interaction between phase-matched tunnelly coupled quasi-localized eigenmodes of nonlinear planar dielectric waveguide and incident beam. We demonstrate that by means of variation of input beam or guided wave intensities...
We show that transverse local narrowing of metal-dielectric-metal (MDM) plasmonic slot waveguide can squeeze plasmon mode in transverse direction (along the slot) up to several tens of nanometers. We consider the two types of narrowing: step-wise and smooth and calculate the structure and dispersion of 2D plasmonic eigenmodes in both cases. We also find the minimal possible scales of the plasmon nanolocalization.
This work is devoted to studying the possibilities of using a femtosecond laser facility and a scanning atomic-force microscope (AFM) for nonlinear optical diagnostics. The developed technique ensures an optical resolution of 30 nm for gold nanoparticles. It is shown that the presence of the AFM tip significantly affects the nonlinear optical response of separate gold nanoparticles.
One of the actual and quickly developing spheres of modern dynamics is the turbulence theory in superfluids involving Bose-Einstein condensate (BEC) of atoms of alkaline elements. At studying the turbulence in BEC it is important to know how do vortices form and interact with each other, and what part do they play in process of transition from a condensate to a turbulence state.
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