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Optically Controlled Fine-tuning Phase Shift Cell Based on Thin-film Ge2Sb2Te5 for Light Beam Phase Modulation 基于薄膜 Ge2Sb2Te5 的光控微调移相单元，用于光束相位调制
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-13 DOI: 10.1134/s0021364024602598
A. V. Kiselev, A. A. Nevzorov, A. A. Burtsev, V. A. Mikhalevsky, N. N. Eliseev, V. V. Ionin, A. A. Lotin
{"title":"Optically Controlled Fine-tuning Phase Shift Cell Based on Thin-film Ge2Sb2Te5 for Light Beam Phase Modulation","authors":"A. V. Kiselev, A. A. Nevzorov, A. A. Burtsev, V. A. Mikhalevsky, N. N. Eliseev, V. V. Ionin, A. A. Lotin","doi":"10.1134/s0021364024602598","DOIUrl":"https://doi.org/10.1134/s0021364024602598","url":null,"abstract":"<p>We present the experimental study of free-space optical control of the optical beam phase shift caused by the formation of a layered structure in an elementary controllable cell made of phase-change material Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> subjected to the controlling effect of pulsed laser radiation. The phase change of the signal optical beam passing through the controlled cell from phase-change material relative to the control beam in the Jamin interferometer is demonstrated.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190799","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}
引用次数: 0
Experimental Demonstration of the Microprocessing of the Polystyrene Surface Using a Photonic Hook 使用光子钩对聚苯乙烯表面进行微加工的实验演示
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s002136402460174x
O. V. Minin, I. V. Minin
{"title":"Experimental Demonstration of the Microprocessing of the Polystyrene Surface Using a Photonic Hook","authors":"O. V. Minin, I. V. Minin","doi":"10.1134/s002136402460174x","DOIUrl":"https://doi.org/10.1134/s002136402460174x","url":null,"abstract":"<p>The formation of craters with the characteristics varying in the longitudinal and transverse directions at the laser microperforation of dielectric materials faces significant problems. In this work, a method have been proposed for the microstructuring of polystyrene as an example of polymeric materials involving laser photonic hooks and a low-cost cw laser. An optical fiber with an asymmetric conical tip has been used to form a photonic hook. Experiments demonstrate that curved microcraters with a shape depending on the power of laser radiation can be formed in a polymer substrate.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190807","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}
引用次数: 0
Energy Transfer between Coupled Planar Magnon Waveguides Near an Exceptional Point 异常点附近耦合平面磁子波导之间的能量传递
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024602045
O. S. Temnaya, S. A. Nikitov
{"title":"Energy Transfer between Coupled Planar Magnon Waveguides Near an Exceptional Point","authors":"O. S. Temnaya, S. A. Nikitov","doi":"10.1134/s0021364024602045","DOIUrl":"https://doi.org/10.1134/s0021364024602045","url":null,"abstract":"<p>Energy transfer is investigated in coupled planar magnon “ferromagnet–normal metal” heterostructures with equivalent amplification and damping of spin waves, in which an exceptional point (point in the space of the parameters of a system where its eigenvalues and eigenvectors degenerate) can be observed. It is shown that an increase in the direct current of different polarities (causing a change in the spin-polarized current) leads to an increase in the length of energy transfer from one heterostructure to another, which tends to infinity at the exceptional point. The mismatch in the natural magnetization damping constants of the two waveguides reduces the critical current at which the exceptional point arises, whereas the mismatch in the wavenumbers (the absence of phase-velocity synchronism) increases the critical current at a bounded energy transfer length. The results presented can be used to design controlled magnon directional interconnects.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190804","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}
引用次数: 0
Stabilization of Optical Bubbles Near the Axis of a Helical Waveguide 稳定螺旋波导轴附近的光学气泡
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024602264
V. P. Ruban
{"title":"Stabilization of Optical Bubbles Near the Axis of a Helical Waveguide","authors":"V. P. Ruban","doi":"10.1134/s0021364024602264","DOIUrl":"https://doi.org/10.1134/s0021364024602264","url":null,"abstract":"<p>It has been shown numerically that coupled nonlinear Schrödinger equations describing the interaction between the left and right circular polarizations of a paraxial optical wave in a defocusing Kerr medium with an anomalous dispersion in a helical waveguide have stable solutions in the form of elongated stationary rotating bubbles with several optical vortices attached to the ends. A bubble is an arbitrarily long quasi-cylindrical three-dimensional cavity in one of the components filled with the opposite component. The transverse profile of the bubble is determined by the shape of the cross section of the waveguide, the helix pitch, the number of vortices, and the background intensity of the surrounding component rather than by the total amount of the filling component.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190800","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}
引用次数: 0
Spatiotemporal Localization of X-Ray Emission Regions in a Long High-Voltage Discharge 长高压放电中 X 射线发射区的时空定位
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024601751
E. V. Parkevich, K. V. Shpakov, A. A. Rodionov, I. S. Baidin, Ya. K. Bolotov, A. V. Oginov
{"title":"Spatiotemporal Localization of X-Ray Emission Regions in a Long High-Voltage Discharge","authors":"E. V. Parkevich, K. V. Shpakov, A. A. Rodionov, I. S. Baidin, Ya. K. Bolotov, A. V. Oginov","doi":"10.1134/s0021364024601751","DOIUrl":"https://doi.org/10.1134/s0021364024601751","url":null,"abstract":"<p>Synchronous spatiotemporal measurements of hard X rays emitted during the development of a high-voltage discharge at voltages of ~1 MV in half-meter open air gaps have been carried out for the first time. Using an array of scintillation detectors with lead diaphragms and the nanosecond photography of the discharge in the intrinsic luminescence, it has been shown that X rays are emitted in the discharge development stage when numerous brightly luminescent plasma channels are formed in the entire discharge gap and the discharge current with an amplitude of hundreds of amperes flows. It has been found that the emission of X rays (photons with energies above 5 keV) can start almost synchronously in the entire discharge gap, including the cathode and anode regions, near-cathode and near-anode regions, and the middle of the discharge gap. The statistical distributions of the total power and the number of the observed X-ray flashes along the discharge gap have been obtained.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190802","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}
引用次数: 0
Logarithmic Relaxation of the Photoconductivity of a Quasi-One-Dimensional TiS3 Semiconductor 准一维 TiS3 半导体光电导性的对数弛豫
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024602197
I. G. Gorlova, S. G. Zybtsev, V. Ya. Pokrovskii, S. A. Nikonov, S. V. Zaitsev-Zotov, A. N. Titov
{"title":"Logarithmic Relaxation of the Photoconductivity of a Quasi-One-Dimensional TiS3 Semiconductor","authors":"I. G. Gorlova, S. G. Zybtsev, V. Ya. Pokrovskii, S. A. Nikonov, S. V. Zaitsev-Zotov, A. N. Titov","doi":"10.1134/s0021364024602197","DOIUrl":"https://doi.org/10.1134/s0021364024602197","url":null,"abstract":"<p>Transient processes in the photoconductivity of TiS<sub>3</sub> single crystals exposed to rectangular light pulses in the wavelength range of λ = 405–940 nm are investigated. It is established that the decay in the photoconductivity after switching the light off at temperatures from 78 to 180 K is described by a logarithmic law in the range from 10<sup>–3</sup> to 10<sup>2</sup> s (i.e., when time changes by five orders of magnitude). This means that the relaxation process is characterized by times ranging, at least, from several tens of microseconds to several tens of minutes. It is shown that the relaxation is basically successive: the recombination barrier increases while the conductivity approaches the equilibrium value.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190805","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}
引用次数: 0
Production of Positrons by Cosmic Rays 宇宙射线产生的正电子
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024601970
I. M. Dremin, D. O. Chernyshov
{"title":"Production of Positrons by Cosmic Rays","authors":"I. M. Dremin, D. O. Chernyshov","doi":"10.1134/s0021364024601970","DOIUrl":"https://doi.org/10.1134/s0021364024601970","url":null,"abstract":"<p>It is shown that electromagnetic interactions of cosmic ray protons provide a noticeable contribution to positrons production. This is due to a combination of low energy threshold of electron–positron pair creation compared to the thresholds of pion creation in strong interactions and rapid decrease of the cosmic rays energy spectrum. Moreover, the electromagnetically produced positrons are very soft, therefore their annihilation with background electrons directly produces the observed 511 keV gamma-line.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190797","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}
引用次数: 0
Laser Transfer of Upconversion Nanoparticles 上转换纳米粒子的激光转移
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024602069
V. S. Zhigarkov, V. I. Yusupov, E. V. Khaydukov
{"title":"Laser Transfer of Upconversion Nanoparticles","authors":"V. S. Zhigarkov, V. I. Yusupov, E. V. Khaydukov","doi":"10.1134/s0021364024602069","DOIUrl":"https://doi.org/10.1134/s0021364024602069","url":null,"abstract":"<p>A method of the transfer of NaYF<sub>4</sub>:Yb<sup>3+</sup>Tm<sup>3+</sup>/NaYF<sub>4</sub> upconversion core/shell nanoparticles with an average size of 30 nm via laser-induced forward transfer is proposed. The method provides a high spatial resolution by creating a “sandwich” structure on the donor substrate: for reliable fixation, nanoparticles are located between gold layers 50 and 20 nm thick. The transfer of upconversion nanoparticles is implemented by focusing nanosecond laser radiation into a 30-μm-diameter spot and at optimal pulse energies of 8.5–25 μJ. It has been shown that, despite large temperature, <span>(Delta T &gt; 1000{kern 1pt} )</span> K, and pressure, <span>(Delta P &gt; 150{kern 1pt} )</span> MPa, fluctuations upconversion nanoparticles fully retain their photoluminescent characteristics.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190806","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}
引用次数: 0
Description of the Stark Broadening of Spectral Lines in Plasmas Taking into Account the Nonstationary Ion Microfield within the Theory of Markov Processes 马尔可夫过程理论中考虑到非稳态离子微场的等离子体光谱线斯塔克展宽描述
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024602355
A. Yu. Letunov, V. S. Lisitsa, P. A. Loboda, A. A. Novikov
{"title":"Description of the Stark Broadening of Spectral Lines in Plasmas Taking into Account the Nonstationary Ion Microfield within the Theory of Markov Processes","authors":"A. Yu. Letunov, V. S. Lisitsa, P. A. Loboda, A. A. Novikov","doi":"10.1134/s0021364024602355","DOIUrl":"https://doi.org/10.1134/s0021364024602355","url":null,"abstract":"<p>The influence of ion thermal motion on the Stark broadening of spectral lines in plasmas is investigated within the frequency fluctuation method (FFM). The method for the consistent calculation of the jumping frequency, which is the main FFM parameter, is suggested on the basis of the S. Chandrasekhar and J. von Neumann stochastic theory. The calculations of the neutral hydrogen spectra in plasmas are presented. These results are compared with the experimental data. The spectra of the Ar dopant in the deuterium plasma are calculated taking into account ion thermal motion. The effect of ion thermal motion on the dip in the He<sub>β</sub> spectral line of the He-like Ar ion is shown. The calculations of the He<sub>β</sub> lineshape of the He-like Ti ion are compared with experimental data.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190803","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}
引用次数: 0
Probe Absorption Spectroscopy As a Tool to Study the Excited States in a Cooperative System of Two Organic Molecules 探针吸收光谱是研究两种有机分子合作体系中激发态的一种工具
IF 1.3 4区 物理与天体物理
JETP Letters Pub Date : 2024-09-03 DOI: 10.1134/s0021364024602227
E. A. Tarasevich, M. G. Gladush
{"title":"Probe Absorption Spectroscopy As a Tool to Study the Excited States in a Cooperative System of Two Organic Molecules","authors":"E. A. Tarasevich, M. G. Gladush","doi":"10.1134/s0021364024602227","DOIUrl":"https://doi.org/10.1134/s0021364024602227","url":null,"abstract":"<p>The applicability of the method for measuring the probe absorption and gain spectra in a system of quantum emitters excited by a resonant driving field for studying cooperative photoluminescence is considered. The gain and attenuation of a probe signal in the system of two quantum emitters with the dipole–dipole interaction have been calculated for the conditions of observing the cooperative photoluminescence of a pair of impurity molecules described in the literature and close to them. The resulting dependences demonstrate the structure of excited collective molecular states, which can be used to reconstruct the positions of molecules in a matrix and to determine the difference in their photophysical properties. Thus, the probe absorption and gain spectra can be used to analyze the photoluminescence of quantum-entangled particles and to transform light signals.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142190798","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}
引用次数: 0
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