Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ
“Известия Российской академии наук. Серия физическая” (Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, ISSN 0367-6765; English translation: “Bulletin of the Russian Academy of Sciences: Physics”, ISSN 1062-8738) is a Russian peer-reviewed scientific journal established in 1936 as the Bulletin of the Academy of Sciences of USSR: Physics Series. It presents full-text articles with the most recent results in miscellaneous fields of physics and astronomy: nuclear physics, cosmic rays, condensed matter physics, plasma physics, optics and photonics, nanotechnologies, solar and astrophysics, physical applications in material sciences, life sciences, etc. The journal focuses on the most relevant multidisciplinary topics in natural sciences, both fundamental and applied.
For more than 80 years, the main purpose of the journal is to provide authors with the opportunity to publish and discuss the results of relevant fundamental and applied scientific research, presented at conferences, symposiums and scientific schools, organized by the Russian Academy of Sciences, which are recognized by the world scientific community and interdisciplinary experts. The journal accepts for publishing full-text articles, which are prepared on the base of best talks, recommended by program committees of the scientific events, which are of interest to a wide range of readers. Articles containing new and previously unpublished results are peer-reviewed by at least two independent reviewers and are published in special thematic issues of the journal. The journal is open for publishing of the most authoritative and advanced research results in the field of fundamental and applied physics, obtained in Russia and neighboring countries, as well as from authors from all over the world.
The journal is published by the Russian Academy of Sciences under the conduction of the Physical Sciences Division of RAS. The originator is the Editorial Board of the journal “Bulletin of the Russian Academy of Sciences: Physics”.
Until 2018, the journal was published by “Nauka” Publishing House.
Preparation of the original layout and publication of the journal is currently carried out under the state contract by LLC “Thematic Editorial”.
Certificate of registration of mass media ПИ No. ФС 77 – 82377 dated December 10, 2021, issued by the Ministry of press and information of the Russian Federation.
The journal is included in the List of journals recognized by the Higher Attestation Commission of the Ministry of Science and Higher Education of the Russian Federation and included into the Russian scientific citation system RSCI. The translated version of the journal – Bulletin of the Russian Academy of Sciences: Physics – is indexed in Scopus and is included in the Russian Science Citation Index database on the Web of Science platform.
English version of the journal – Bulletin of the Russian Academy of Sciences. Physics is published by Allerton Press Inc. (Pleiades Publishing) and distributed by Springer Nature Switzerland AG.
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Vol 89, No 1 (2025)
Wave Phenomena: Physics and Applications
Optical pulses in a non-Hermitian medium near a singularity
Abstract
The spectral method was used to solve the problem of interaction of short optical pulses with RT-symmetric photonic crystals under conditions of frequency singularity. It is shown that with a small deviation from the exceptional point of spontaneous decay of PT-symmetric field modes, a frequency singularity of the transmission and reflection coefficients of the structure arises. This leads to a significant narrowing of the pulse spectra and an increase in their amplitude and duration with unidirectional Bragg reflection.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):6-12
6-12
Optical computation of the Laplace operator at normal incidence using a multilayer metal-dielectric structure
Abstract
We theoretically and numerically investigate the optical implementation of the second-order spatial differentiation operation using a layered metal-dielectric structure at normal light beam incidence. Numerical simulation results confirm the theoretical results and show the possibility of ‘optical calculation of the Laplace operator with high quality.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):13-17
13-17
Radioelectric effect in a superlattice based on a 3D Dirac crystal
Abstract
A kinetic theory for the radioelectric effect in a superlattice based on a 3D Dirac crystal in a constant electric field has been constructed. The current density has been shown to get the resonance in the case where the Bloch frequency is a multiple of the frequency of the electromagnetic wave. The latter can lead to a change in the direction of the current density. The amplitude dependence of the radioelectric current density has been studied.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):18-22
18-22
Plasma waves in a two-dimensional superlattice under the influence of a nonlinear electromagnetic wave
Abstract
An expression is obtained that allows us to determine the law of dispersion of plasma waves ω(𝑘) in a two-dimensional semiconductor superlattice under the influence of a nonlinear electromagnetic wave and, in the extreme case of weak nonlinearity, an analytical expression for ω(𝑘) is found. The possibility of controlling the frequency of the plasma wave by the parameters of a nonlinear wave has been established.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):23-27
23-27
Conversion of selective characteristics of electrically controlled chirped multilayer inhomogeneous diffraction structures based on photopolymerizing compositions with nematic liquid crystals
Abstract
We developed the analytical model of optical radiation diffraction on chirped multilayer inhomogeneous diffraction structures formed by the holographic method in photopolymerizing compositions with nematic liquid crystals having smooth optical heterogeneity in layer thickness. By numerical calculation, it was shown that using the chirping method it is possible to multiply the angular and spectral characteristics of multilayer inhomogeneous holographic diffraction structures formed in photopolymerizing compositions with nematic liquid crystals.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):28-33
28-33
On the superluminal objects in non-equilibrium media
Abstract
An analysis of superluminal propagation of resonant and quasi-resonant soliton-like laser pulses in non-equilibrium media is presented. It is shown that such pulses are unstable. However, at the initial stage of instability development, it is possible to observe superluminal propagation of these pulse profiles due to the reshaping mechanism.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):34-38
34-38
Propagation of fractal speckles in optical systems and in free space
Abstract
The diffraction transformation of wave fractal fields is considered. It is shown that when light beams with a speckle structure propagate in optical systems and in free space, their fractal properties have a high degree of stability.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):39-43
39-43
Laser formation of relativistic electron mirrors and generation of incoherent X-rays
Abstract
Using numerical 2D-PIC simulations, the generation of X-rays during the interaction of an oncoming laser wave with a relativistic electron mirror formed by a powerful accelerating laser pulse from a plasma layer is investigated. The structure of the radiated field in the far zone is investigated, the spectral density of the radiation field and the angular distribution of the pulse energy are found. Changing the parameters of the accelerating and counter waves allows one to control the characteristics of the radiation.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):44-50
44-50
Quantum peculiarities of waves in the process of parametric down conversion of light
Abstract
We analyzed the mutual influence of simultaneous processes of second harmonic generation and parametric down conversion within the framework of a fully quantum approach. The effect of depletion of quantum pumping has been revealed. The effect of establishing a balance between the processes under consideration and achieving an equilibrium number of photons in the field modes is found. The generation of a strongly entangled two-mode field is demonstrated.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):51-56
51-56
Differential gain of THz radiation in crystalline quartz plate in the field of pump wave
Abstract
The possibility to exploit nonlinear Fabry–Perot interferometers to differential gain of terahertz radiation in the field of a pump wave of the same frequency was theoretically considered. It is shown that in mirrorless nonlinear Fabry–Perot interferometer consisted of crystalline quartz plate, which reflection is determined by Fresnel reflection only, the regime of maximal differential gain of radiation with central frequency at 1 THz can be observed at thickness of working medium near 1 mm and at radiation intensity with order of magnitude at 108 W⋅cm−2.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):57-62
57-62
(2+1)D soliton pairs in a planar quadratic nonlinear crystal with inhomogeneity
Abstract
The process of propagation and formation of pulse pairs in a quadratically nonlinear crystal with two waveguides is investigated when parameters related to the position of the waveguides relative to each other, delay and phase ratio between pulses change. A change in the pulse propagation mode during the approach of waveguides and the dependence of the nature of the interaction between the pulses on the initial phase ratio were found.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):63-69
63-69
Microcavities and photonic time crystals formed by collision of half-cycle light pulses in a resonant medium
Abstract
We discussed the authors’ recent research into the generation and ultrafast control of light-induced dynamic microcavities and photonic time crystals created by the collision of half-cycle pulses in a medium. The possibility of guiding microcavities during the collision of self-induced transparency half-cycle pulses of the same polarity has been demonstrated.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):70-78
70-78
On the dynamics of the parameters of pulses propagating in the medium with anomalous dispersion of the group velocity
Abstract
We analyzed the mutual influence of simultaneous processes of second harmonic generation and parametric down conversion within the framework of a fully quantum approach. The effect of depletion of quantum pumping has been revealed. The effect of establishing a balance between the processes under consideration and achieving an equilibrium number of photons in the field modes is found. The generation of a strongly entangled two-mode field is demonstrated.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):79-83
79-83
Application of microwave photonics methods in the design of microwave receiving devices for the formation and registration of radio holograms
Abstract
A scheme for implementing a microwave photonics receiving device for microwave signals for the formation and registration of radio holograms is proposed. The operation of such a receiving device was studied numerically and experimentally. A data processing method is proposed to reduce the error in determining the source coordinates.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):84-89
84-89
Generation of sub terahertz chaotic radiation in a high-current relativistic gyrotron in the frequency multiplication mode
Abstract
It is shown that for a high-current relativistic Ka-band gyrotron operating in the chaotic generation mode on the lowest mode of a circular waveguide TE1,1, effective radiation is possible at the seventh harmonic of the gyrofrequency on the TE7,2 mode. The relative width of the spectrum of chaotic sub terahertz radiation can exceed 5% at a megawatt output power level.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):90-94
90-94
The effect of two-dimensional phenomena on the bunching of intense electron beams in broadband klystrons
Abstract
The results of a study of the effect of two-dimensional phenomena on the electron beam bunching in single-beam and multi-beam broadband klystrons are presented. The results of a comparative analysis of beam bunching using a one-dimensional and two-dimensional model are presented. The causes of errors in determining the output parameters of broadband klystrons obtained using one-dimensional programs are analyzed.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):95-102
95-102
Reconstructing the spatial distribution of acoustic characteristics by technique of angle harmonics
Abstract
Improved numerical implementation of the two-dimensional functional analytical algorithm is proposed. The algorithm is designed to reconstruct spatial distributions of sound speed and absorption coefficient in a tomography region. The high accuracy of obtained tomograms is illustrated even with large wave sizes and complicated internal structure of object under study.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):107-113
107-113
Conversion of a flat front of a unipolar radiation pulse into a cylindrical one
Abstract
The problem of nonstationary diffraction of a monopolar TM-polarized electromagnetic pulse with a flat front on a thin slit in a perfectly conducting screen is considered. Using computational experiment methods, it has been shown that if the slit width is much smaller than the spatial length of the pulse, then a field is formed behind the screen in the form of a cylindrical monopolar pulse, i. e. there is a transformation of the shape of the incident field front without changing its character (monopolarity).
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):103-106
103-106
Mean field of acoustic waves with discontinuities in randomly inhomogeneous media
Abstract
The features of the construction of closed equations for the mean field of acoustic waves with discontinuous profiles in a randomly inhomogeneous medium are considered. Different approaches to obtaining such equations are compared. It is shown that, despite the smoothing of profiles in the average, the presence of a discontinuity in the profile should be considered before the averaging operation. An exact expression for the mean field of the initial 𝑁-wave is obtained.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):114-121
114-121
Modification of the Van der Waals equation for describing the thermodynamic properties of liquid water
Abstract
In the point of view of liquid water as a real gas, the Van der Waals equation of state is modified for describing isotherms, isochores, and isobars of liquid water in a wide range of pressures and temperatures. The new thermal equation provides a standard transition to thermodynamics with the reproduction of internal energy 𝑈, free energy 𝐹, heat capacity 𝐶V and entropy 𝑆.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):122-128
122-128
Some characteristics of nonlinear potential surface waves in an ideal liquid
Abstract
The potential wave motion along the free surface of a deep ideal liquid is studied. Exact solutions of the equations of motion with physically justified boundary conditions on a free surface are obtained. The shape of the free surface is studied depending on the amplitude and the characteristics of the surface are highlighted. The characteristics of waves depending on the nonlinearity parameter are investigated.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):129-135
129-135
Simulation of spin waves excitation by the impact of an electric field on the domain wall in magnetic films with inhomogeneous magnetoelectric interaction
Abstract
We simulated the dynamics of electric field impact on the domain wall in magnetic films with inhomogeneous magnetoelectric interaction. The result of the simulation is the fact that both homogeneous electric field and inhomogeneous electric field induce excitation of spin waves.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):136-144
136-144
Calculation of a relativistic 300 GHz range gyrotron, considering the real shape of the accelerating voltage pulse
Abstract
Calculations have been performed for a relativistic gyrotron in the 300 GHz range with a power of up to 8 MW. For the experimentally measured accelerating voltage pulse shape, calculations of the output power pulse shape were made using three-dimensional modeling using the large particle method. It has been shown that the total radiation energy at the operating frequency can exceed 4 J.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):145-149
145-149
Application of pulsed acoustic microscopy for studying chitosan-based biocomposite sponges
Abstract
We proposed a method for local assessment of acoustic properties in spongy polymer samples, based on visualizing the microstructure, measuring attenuation, and sound velocity. This approach is relevant to the study of biopolymer composite materials and their structures, as it allows for in situ observation of structural degradation under external influences, as well as investigation of the evolution of native tissue replacement, if necessary.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):150-156
150-156
Numerical investigation of surface wave tomography scheme for three-dimensional inhomogeneities reconstruction
Abstract
A three-dimensional tomographic scheme for reconstructing parameters of inhomogeneous geophysical media is proposed. Initial data are propagation times of surface waves in various frequency ranges. Results of numerical modeling implemented for conditions of the Hawaiian Archipelago are presented, which indicate the operability of the proposed approach.
Izvestiâ Akademii nauk SSSR. Seriâ fizičeskaâ. 2025;89(1):157-162
157-162