Physics of Wave Phenomena最新文献

{"title":"Macroscopic Aspects of Resonant Generation of High-Order Harmonics in Indium Laser Plasma","authors":"V. V. Strelkov,&nbsp;S. A. Bondarenko","doi":"10.3103/S1541308X24700547","DOIUrl":"10.3103/S1541308X24700547","url":null,"abstract":"<p>The generation of high-order harmonics at interaction of intense laser radiation with the plasma of the laser plume formed on an indium target surface has been investigated theoretically. The study is based on integrating the propagation equations for the fields propagating in plasma. The nonlinear polarization is calculated by solving numerically the Schrödinger equation for an ion in a strong laser field. The generating radiation frequencies corresponding to the multiphoton resonance with the indium ion transition from the ground state to the autoionizing state are considered. The macroscopic response at the resonant harmonic frequency is calculated as a function of the propagation length. It is shown that, in the case of generation in plasma consisting of singly ionized indium, the resonant contribution of ions to the phase mismatch can compensate for the contribution of free electrons. This occurs when the harmonic frequency slightly exceeds the resonant frequency. This compensation ensures relatively high generation efficiency.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"33 1","pages":"65 - 71"},"PeriodicalIF":1.1,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Organic Light-Emitting Diodes Based on Eu(III) Complexes Involving 1,1,1-Trifluoro-4-Phenyl-2,4-Butanedione with Ethanoic and n-Butanoic Acids","authors":"A. V. Osadchenko,&nbsp;S. A. Ambrozevich,&nbsp;I. A. Zakharchuk,&nbsp;A. A. Vashchenko,&nbsp;D. S. Daibagya,&nbsp;A. V. Ryzhov,&nbsp;D. N. Pevtsov,&nbsp;N. V. Pevtsov,&nbsp;A. S. Selyukov","doi":"10.3103/S1541308X24700559","DOIUrl":"10.3103/S1541308X24700559","url":null,"abstract":"<p>Organic light-emitting devices (OLEDs) based on novel Eu³⁺ complexes were fabricated and investigated. In the electroluminescence spectrum, characteristic emission of Eu³⁺ is observed; also, an additional wide short-wave band with a maximum at a wavelength of 395 nm and a full width at half-maximum of 60 nm is present. This band is attributed to the contribution of the hole transport layer electroluminescence due to the penetration of charge carriers through the active OLED layer, which leads to electron–hole radiative recombination in PVK. The operating voltage of the OLED was 10 V. Voltage-tunable purplish-white emission was observed for the studied OLEDs, which is confirmed by the chromaticity analysis. The study of the current–voltage characteristics of the manufactured devices showed that they are characterized by two main conduction regimes. The first one (0–7 V) corresponds to a space-charge limited regime; the second one is the trap-limited regime (7–23 V).</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"33 1","pages":"72 - 77"},"PeriodicalIF":1.1,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluation of Bioresorbable Surgical Meshes by Ultrasound","authors":"L. M. Krutyansky,&nbsp;V. L. Preobrazhensky,&nbsp;P. Lecomte-Grosbras,&nbsp;J.-F. Witz,&nbsp;P. Margotin,&nbsp;A. Morch,&nbsp;O. Bou Matar,&nbsp;Ph. Pernod","doi":"10.3103/S1541308X2470050X","DOIUrl":"10.3103/S1541308X2470050X","url":null,"abstract":"<p>We report a new approach to the quantitative ultrasonic examination of resorbable surgical meshes used for abdominal hernia. Information about the current state of a resorbable mesh is important for monitoring the prosthesis integration and the healing processes. The method presumes two successive steps. At first, an acoustic image of a mesh structure is obtained by scanning the object at a relatively high frequency and vectors of the reciprocal lattice are determined by the Fourier transform of the image. At the second step, the object is irradiated along the found direction of the reciprocal lattice by a low frequency wave inclined to the plane of the mesh. The signal of a back reflection is acquired and processed quantitatively as a function of tilt angle or frequency. On an example of model objects artificially fabricated with textile meshes, the ability of the structures under examination to effectively generate Bragg scattering is demonstrated. Comparative tests with objects imitating mesh resorption confirm the method’s ability to reveal mesh degradation.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"33 1","pages":"27 - 35"},"PeriodicalIF":1.1,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Polarization-Sensitive Deep-Groove Absorption Grating Based on Silicon","authors":"Ying Tang,&nbsp;Shaoxin Zheng,&nbsp;Wenkang Huang,&nbsp;Feng Lin,&nbsp;Guilan Feng,&nbsp;Tianqi Zhao,&nbsp;Xufeng Jing,&nbsp;Chenxia Li","doi":"10.3103/S1541308X24700523","DOIUrl":"10.3103/S1541308X24700523","url":null,"abstract":"<p>The paper proposes a deep-groove grating structure that exhibits high absorption characteristics of polarized light in the near-infrared band, as revealed by analyzing the electromagnetic field of this structure. By optimizing parameters such as the period and surface structure dimensions of its unit cell, a high-quality polarization-sensitive grating absorber is obtained. Traditional silicon is limited by a bandgap of 1.12 eV, resulting in poor absorption in the near-infrared band beyond 1000 nm. The deep-groove grating structure designed in this paper overcomes the absorption limitations of silicon itself, successfully extending the upper wavelength limit of the high absorption region to 1500 nm, while also exhibiting polarization-sensitive chara-cteristics.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"33 1","pages":"46 - 56"},"PeriodicalIF":1.1,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143676357","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Parallel Monitoring of the Dynamics of Oxygen and Water Molecule Concentrations under the Action of a Glow Discharge Using Diode Laser Spectroscopy","authors":"A. V. Bernatskiy,&nbsp;I. V. Kochetov,&nbsp;V. V. Lagunov,&nbsp;V. N. Ochkin","doi":"10.3103/S1541308X24700419","DOIUrl":"10.3103/S1541308X24700419","url":null,"abstract":"<p>A two-wavelength diode laser spectrometer has been developed and simultaneous changes in the concentrations of water and oxygen molecules in their mixtures with helium were observed. The concentrations behavior has been investigated at different stages: at the gas injection cycle into an evacuated tube, during burning of a DC glow discharge and at the phase after its shutdown. The measurements were carried out by the absorption of light on weak lines of vibrational-rotational intermode transitions of H₂O and spin-forbidden electron transitions of O₂ at reduced pressures of several millibars with concentration sensitivities of 10¹⁴ and 10¹⁵ cm^–3, respectively. Under such conditions, in addition to homogeneous interactions, heterogeneous interactions of particles with each other and with active surface centers are significant in the formation of the chemical composition of gases. It has been established that for different molecules that are stable under normal conditions, the concentrations at the discharge stage and its afterglow may not correspond to each other. This depends on the type of molecule, the composition of the plasma-forming mixture containing these molecules, the conditions of preparation and the operating mode of the reactor; imbalances of elements in the bulk phase are noted. The experimental results were interpreted using a plasma-chemical kinetic model of a direct current discharge in an O₂–He–H₂O gas mixture taking into account the interactions of electrons, ions and neutral particles in the ground and excited states. In addition to solving the kinetic equations for chemical reactions and the Boltzmann equation for electron energy distribution function, the model provides the profiles of gas temperatures and axial electric field strengths, and takes into account the effect of heating of the neutral gas in the non-equilibrium discharge plasma on the measurement results. To explain the imbalance of elements, in addition to the known heterogeneous processes of particle recombination, it is postulated that previously undiscussed chemical reactions of the decay products of the initial molecules in the plasma occur with particles adsorbed on the walls at the stage of filling the reactor with the plasma-forming gas. The model satisfactorily describes the results of measurements of particle concentrations in the discharge and afterglow stages, and the main macroscopic parameters of the discharge.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"32 6","pages":"410 - 422"},"PeriodicalIF":1.1,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889720","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Amplitude–Phase Structure of the Sound Field in the Deep Sea","authors":"S. P. Aksenov,&nbsp;G. N. Kuznetsov,&nbsp;A. N. Stepanov","doi":"10.3103/S1541308X24700468","DOIUrl":"10.3103/S1541308X24700468","url":null,"abstract":"<p>Amplitude-phase characteristics of sound pressure (SP) in the deep ocean is analytically and numerically investigated under summer conditions. To this end, analytical relations are obtained, which allow calculating and comparing space–frequency structure characteristics of water, leaky, and trapped modes, as well as of the SP field formed by the mode sum. The calculations are performed using the modified Wentzel–Kramers–Brillouin approximation. It is shown that modes of different types dominate at different distances, and this enables describing structure variability of both the amplitude and the phase distribution of the SP field in different zones with a different mode composition. It is found that in the field based on the sum of all modes the mode properties more distinctly manifested at various distances are of those modes which dominate at these distances. As a consequence, space–frequency structures of SP amplitudes are substantially different in different zones. But, due to stability of phase gradients in zones of interference maxima, phase surfaces coincide in shape for all types of modes, all frequencies, and almost all distances. Some difference is only observed for leaky modes in the near-field zone. Numerical values of effective phase velocities of the summed field depend, as expected, on phase velocities of modes of various types and on their “extinction” rate, and they are appreciably different in different zones. This should be taken into account during direction finding and estimation of noise source coordinates.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"32 6","pages":"452 - 465"},"PeriodicalIF":1.1,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Method for Investigation of Rotational Spectra of Heavy Molecules at Their Interaction with the Microwave Field at Frequencies of 2–4 GHz","authors":"I. E. Ivanov,&nbsp;D. E. Dias Mikhailova,&nbsp;V. V. Strelkov,&nbsp;P. S. Strelkov,&nbsp;D. V. Shumeiko","doi":"10.3103/S1541308X24700432","DOIUrl":"10.3103/S1541308X24700432","url":null,"abstract":"<p>An experimental setup based on a powerful ultrawideband microwave source is devised to investigate absorption spectra of gaseous substances. A technique is developed for measuring the absorption coefficient of a substance. It is based on detection of a change in the spectrum of microwave radiation on its passing through the substance under study and is therefore low sensitive to features of the incident radiation spectrum. The accuracy is further increased by multiple repetition of measurements. Rotational spectra of organofluorine compound C₄F₉I vapor are investigated. In the spectral range under consideration, a number of microwave radiation absorption peaks are observed in this compound.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"32 6","pages":"431 - 435"},"PeriodicalIF":1.1,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Specific Features of Laser Modification of Thin Ge2Sb2Te5 Films by the HG01 Mode","authors":"I. A. Budagovsky,&nbsp;P. A. Smirnov,&nbsp;A. S. Zolot’ko,&nbsp;P. I. Lazarenko,&nbsp;M. P. Smayev","doi":"10.3103/S1541308X24700390","DOIUrl":"10.3103/S1541308X24700390","url":null,"abstract":"<p>Phase-change materials are very interesting and promising objects for various optical applications due to simple and high-speed switching between the amorphous and crystalline states. In this study, we consider the specific features of laser crystallization and ablation of thin amorphous Ge₂Sb₂Te₅ films exposed to the HG₀₁ (Hermite–Gaussian TEM₀₁) mode of cw visible light. This exposure led to two-zone crystallization or ablation, depending on the laser intensity. Microscale two-zone ablation made it possible to observe Young’s fringes for the radiation transmitted through a sample, as in the case of two-point-source interference. This approach is promising for express analysis of the laser beam profile.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"32 6","pages":"393 - 400"},"PeriodicalIF":1.1,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Noise Amplification by a Relativistic Electron Beam in a Double Coaxial Plasma–Metal Waveguide","authors":"V. I. Rogozhin,&nbsp;A. E. Donets,&nbsp;A. B. Buleyko,&nbsp;O. T. Loza,&nbsp;A. G. Bykov,&nbsp;V. P. Bakhtin,&nbsp;A. A. Ravaev","doi":"10.3103/S1541308X24700444","DOIUrl":"10.3103/S1541308X24700444","url":null,"abstract":"<p>Effective noise amplification is detected for the first time at the interaction of a relativistic electron beam with slow plasma waves in a coaxial plasma–metal waveguide. Unlike configurations of existing plasma masers, this configuration of the plasma–beam interaction region can be used for long operation in the pulsed-periodic mode with the hollow electron beam deposition on an easily cooled collector. In addition, the internal metal conductor at the ground potential increases the limiting vacuum current of the electron beam and the current at which the maximum transfer efficiency of the electron beam energy to the plasma wave is achieved. The electron beam with the energy of 250 keV, current of up to 1.5 kA, and duration of 2.5 ns has interacted with the plasma waves with the measured concentration of up to 3 × 10¹³ cm^–3. A radiation spectrum from 2 to 6 GHz with the power of up to 70 MW is recorded.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"32 6","pages":"436 - 440"},"PeriodicalIF":1.1,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural Phase Transitions in an Adsorbed Chlorine Layer on a Pre-Oxidized Ag(111) Surface","authors":"B. V. Andryushechkin,&nbsp;T. V. Pavlova,&nbsp;V. M. Shevlyuga","doi":"10.3103/S1541308X24700456","DOIUrl":"10.3103/S1541308X24700456","url":null,"abstract":"<p>The structural transformations occurring in a chlorine monolayer on a previously oxidized Ag(111) surface, containing Ag₆O₆ oxide rings centered at vacancies in the upper silver layer, were investigated using scanning tunneling microscopy (STM) and density functional theory (DFT) calculations. It is found that, at a temperature of 80 K in the initial stage, chlorine atoms form chain structures in the gaps between oxide rings. As the coverage increases, chlorine forms domains having a uniaxially compressed structure, with boundaries determined by the local oxide. Continued Cl₂ adsorption leads to condensation of molecular chlorine. Annealing of the resulting system to 300 K causes significant structural transformations on the surface, resulting in the formation of islands of (20–30) Å in size with the reconstruction Ag(111)-(3 × 3)-Cl, as well as chains of objects with a height of ≈1 Å. Based on the DFT calculations these objects were found to be O–Cl quasi-molecules, formed by surface oxygen atoms and adsorbed chlorine atoms.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"32 6","pages":"441 - 451"},"PeriodicalIF":1.1,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}