Control of light pulses in electromagnetically induced grating
Control of light pulses in electromagnetically induced grating
V.G. Arkhipkin$^1$, S. A. Myslivets$^1$, P. S. Pankin$^2$
Theoretically studied propagation of a weak light pulse in electromagnetically induced grating (EIG) in the presence of an additional control field in four-level atoms of N-type. It is shown that one can effectively control the reflection and transmission of EIG. All–optical switching of the reflected and transmitted pulse is demonstrated.
Show AbstractCoupled optical Tamm states at the boundary of a photonic crystal and a nanocomposite consisting of core–shell particles
Coupled optical Tamm states at the boundary of a photonic crystal and a nanocomposite consisting of core–shell particles
S. Ya. Vetrov$^{1,2}$, P. S. Pankin$^{1,2}$, I.V. Timofeev$^{1,2}$,
The optical Tamm states localized at both edges of a one–dimensional photonic crystal encloused by a nanocomposite are investigated. The nanocomposite consists of spherical nanoparticles with a dielectric core and a metal shell, which are dispersed in a transparent matrix. It is shown that the position of the spectral peaks is sensitive to the thickness of the outermost layer of the photonic crystal.
Show AbstractUse of the semiconductor sandwich heterostructure for the enhancement of the sub–THz generation properties
Use of the semiconductor sandwich heterostructure for the enhancement of the sub–THz generation properties
V.A. Maksimenko$^1$, V. V. Makarov$^1$, A. A. Koronovskii$^2$, A. E. Hramov$^1$, K.N. Alekseev$^3$, A. G. Balanov$^3$
In this paper we propose the semiconductor sandwich heterostructure for the improving of the properties of domain generation. Within the numerical study of the collective dynamics of charge we demonstrate the possibility of a simultaneous increase in the frequency and power of the current oscillations, caused by the travelling domains, due to the synchronization of the domain dynamics in the different parts of the considered semiconductor sample.
Show AbstractInteraction between the relativistic electron beam focused by uniform magnetic field and the field of generator with periodic waveguide
Interaction between the relativistic electron beam focused by uniform magnetic field and the field of generator with periodic waveguide
A. I. Slepkov, O.V. Gallyamova
The results of numerical simulation of the interaction between the relativistic electron beam focused by uniform magnetic field and the field of generator with axisymmetric periodic waveguide are reported. The theoretic and numerical analysis of resonance effect of focusing magnetic field were carried out. The range of resonance amplification and cyclotron absorption were revealed and studied.
Show AbstractNearfield microwave microscope for measuring the conductivity of thin metallic films
Nearfield microwave microscope for measuring the conductivity of thin metallic films
V.I. Frolov$^1$, V.A. Vdovin$^2$, V.G. Andreev$^3$
An experimental prototype of the near-field microscope based on the coaxial microwave resonator and a vector network analyzer R&S ZVA 24 is described. The results of test measurements of the shift of the resonance frequency and the quality factor of the resonance curve with the use of bulk conductors made of metals of different conductivity are presented. It is shown qualitatively that the resonant frequency and the quality factor decreases as the probe approaches the surface of the conductor. Q–value is minimal when using a conductor with the lowest conductivity.
Show AbstractStudying the optical coefficients of nanometer–thick copper and gold films at microwave frequencies
Studying the optical coefficients of nanometer–thick copper and gold films at microwave frequencies
S.M. Pronin$^1$, V.A. Vdovin$^2$, V.G. Andreev$^3$
Optical coefficients of copper and gold films with thicknesses 0.5 to 10 nm are studied at the frequency of 10GHz. The vector network analyzer R&S ZVA 24 and waveguide resonator are used in measuring circuit. It is shown that the experimental results for transmission coefficient of the copper films correspond to the calculated values when equivalent thickness reduced on the 6 nm is introduced. The measured value of conductivity of the copper film is almost an order of magnitude less than the bulk conductivity of copper.
Show AbstractEstimate of geometrical–phase corrections for transducers of ring antenna
Estimate of geometrical–phase corrections for transducers of ring antenna
V.A. Burov, D.I. Zotov, O.D. Rumyantseva
Algorithm of estimating the geometrical and phase corrections for receiving–transmitting transducers of ring antenna array of ultrasound tomograph is discussed. These corrections should be taken into account during reconstruction of spatial distributions of sound velocity and absorption of an investigated object, in order to avoid a deterioration of tomogram quality.
Show AbstractSecond harmonic generation in regular domain structures with fluctuations of the thickness of intermediate layers
Second harmonic generation in regular domain structures with fluctuations of the thickness of intermediate layers
A.M. Vyunishev$^{1,2}$, I.V. Timofeev$^{1,2}$, A.S. Chirkin$^{3}$
The second optical harmonic generation in quadratic nonlinear crystal structure is theoretically investigated. The structure consists of regularly modulated inhomogeneous layers that are divided by homogeneous layers of random thickness. The dependence of the process efficiency on the layer number and dispersion of the layer thickness is determined.
Show AbstractNumerical simulation of new technique of forming virtual cathode in relativistic electron beam in coaxial drift space with attached external magnetic field
Numerical simulation of new technique of forming virtual cathode in relativistic electron beam in coaxial drift space with attached external magnetic field
A.A. Koronovskiy, S.A. Kurkin, A.A. Badarin, A.E. Hramov
In this paper is considering dynamics of electron beam in coaxial drift space in external inhomogeneous magnetic field. Numerical simulation, which was conducting, show possibility forming of virtual cathode with help of compression relativistic beam by external magnetic field.
Show AbstractOn Electron Beam Grouping in Non–Uniform Magnetic Fields
On Electron Beam Grouping in Non–Uniform Magnetic Fields
D.A. Mikheev, V. L. Savvin
A new principle of the electron beam grouping with cyclotron rotation in inhomogeneous magnetic fields is proposed. It is shown that the electron 3D grouping may not be accompanied by an increase in space charge density in contrast to the electron bunching during the one-dimensional motion of the electrons.
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