-
Article
Optical second harmonic generation and its photoinduced dynamics in ferroelectric semiconductor Sn2P2S6
By means of optical pump–probe technique, the ultrafast dynamics of nonlinear optical response of the ferroelectric semiconductor Sn2P2S6 crystal excited with a femtosecond laser pulse has been investigated. It h...
-
Article
Structure of currents in the soliton of an internal wave
The characteristics of strongly nonlinear solitary internal waves (solitons), which are calculated by the nonlinear numerical model of the Massachusetts Institute of Technology (MITgcm), are studied. The model...
-
Article
Photoinduced dynamics and femtosecond excitation of phonon modes in ferroelectric semiconductor Sn2P2S6
The ultrafast dynamics of electrons and phonons excited by femtosecond light pulses in ferroelectric semiconductor Sn2P2S6 is investigated using the optical pump–probe technique. It is demonstrated that a soft mo...
-
Article
Edge effects in second-harmonic generation in nanoscale layers of transition-metal dichalcogenides
The results of studying the optical properties of nanoscale single crystals of MoS2:Cl2 and WS2:Br2 semiconductor compounds are presented. In microscopic images obtained at the wavelength of the second (400 nm), ...
-
Article
Transformation of surface waves over a bottom step
We analyze in detail the problem of the transformation of surface gravity waves over a bottom step in a basin of arbitrary depth in the linear approximation. We found that strict analytical results can be obta...
-
Article
Dynamic processes in helical electron beams in gyrotrons
The results of theoretical and experimental studies of collective processes in helical electron beams in gyrotron-type devices are generalized. Main attention is paid to low-frequency oscillations associated w...
-
Article
Nonlinear optical microscopy and spectroscopy of ferroelectric and multiferroic materials
The specific features of the application of two-photon microscopy and spectroscopy to the investigation of multiferroic and piezoelectric nanostructures have been considered. It has been shown that the nonline...
-
Article
Map** of two-photon luminescence amplification in zinc-oxide microstructures
The map** of two-photon excited luminescence in aggregations of free-standing zinc oxide microrods has been carried out at room temperature. Two-photon luminescence spectra in the excitonic region for indivi...
-
Article
A computer-aided two-photon scanning microscope
A computer-aided digital microscope for studying microstructures at wavelengths of the second optical harmonic and two-photon luminescence is designed. In contrast to commercial instruments, the microscope is ...
-
Article
Investigation of ferroelectric properties of bismuth ferrite films by the second optical harmonic generation technique
The specific features of the ferroelectric polarization switching in bismuth ferrite thin films doped with neodymium ions are investigated by the optical second harmonic generation technique. The structure and...