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Universal Features of Manifestation of Relationship between Local and Segmental Dynamics of Glassy Polymers at Terahertz Frequencies in IR Spectra 红外光谱中太赫兹玻璃聚合物局部动力学和段动力学关系表现的普遍特征
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-03-11 DOI: 10.1134/S0030400X22130045
V. A. Ryzhov
{"title":"Universal Features of Manifestation of Relationship between Local and Segmental Dynamics of Glassy Polymers at Terahertz Frequencies in IR Spectra","authors":"V. A. Ryzhov","doi":"10.1134/S0030400X22130045","DOIUrl":"10.1134/S0030400X22130045","url":null,"abstract":"<p>Temperature dependences of low-frequency IR spectra of glassy polymers are studied in the range of ν = 0.24–4 THz (8–135 cm<sup>–1</sup>) at temperatures from 90 to 400 K. Analysis of these dependences revealed absorption corresponding both to individual and correlated torsional vibrations, which initiate the relaxation dynamics. The temperature evolution of the IR spectra in the range of terahertz frequencies exhibits three universal behaviors, namely, the low-temperature regime corresponding to the anharmonicity of torsional vibrational motions, the high-temperature regime caused by the contribution of α relaxation (glass formation), and the intermediate stage related to the activation of the conformational mobility of chains due to the β transition. The results obtained are applicable to polymers with both hydrogen and van der Waals bonds between macromolecules.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 12","pages":"605 - 611"},"PeriodicalIF":0.6,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4469961","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: 1
Synthesis and Mesomorphic Properties of Biphenyl Derivatives with a Central Unit Based on Oligomeric 1,6-Hexamethylene Diisocyanate 1,6-六亚甲基二异氰酸酯低聚物中心基联苯衍生物的合成及介形性质
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-03-11 DOI: 10.1134/S0030400X22130021
S. A. Gorbachev, V. V. Zuev
{"title":"Synthesis and Mesomorphic Properties of Biphenyl Derivatives with a Central Unit Based on Oligomeric 1,6-Hexamethylene Diisocyanate","authors":"S. A. Gorbachev,&nbsp;V. V. Zuev","doi":"10.1134/S0030400X22130021","DOIUrl":"10.1134/S0030400X22130021","url":null,"abstract":"<p>A series of compounds with biphenyl as a mesogenic fragment having a structure that models LC dimers and polymers with mesogenic groups of the side chain and a star-shaped structure have been synthesized. An approach to the synthesis of such compounds under soft conditions without a complex procedure of purification with quantitative yield has been developed; it is an implementation of the click chemistry methods for synthesizing LC compounds. It is shown for compounds with biphenyl as a mesogenic fragment that the LC state is observed only when the number of biphenyls in one compound is 3 (i.e., the compounds are similar to polyesters with biphenyl as a mesogenic fragment, which exhibit LC behavior). For compounds with the potentially weak mesogen such as biphenyl, the decisive factor in the formation of the LC state and smectic mesomorphism is the formation of intermolecular hydrogen bonds.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 12","pages":"593 - 599"},"PeriodicalIF":0.6,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4471716","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
Analysis of Characteristics of a Waveguide Device for Combining External Optical Beams 外光束组合波导器件特性分析
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-03-11 DOI: 10.1134/S0030400X22130033
V. I. Nalivaiko, M. A. Ponomareva
{"title":"Analysis of Characteristics of a Waveguide Device for Combining External Optical Beams","authors":"V. I. Nalivaiko,&nbsp;M. A. Ponomareva","doi":"10.1134/S0030400X22130033","DOIUrl":"10.1134/S0030400X22130033","url":null,"abstract":"<p>Design of a planar waveguide light-beam combiner that performs summation of an array of external light beams is proposed. Variants of combiner design are analyzed, and a 3D variant with an optical isolator is proposed. Working parameters of combiner elements as a function of refractive indices of the structure layers are calculated. Minimum dimensions of the combiner input/output diffraction elements are estimated.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 12","pages":"600 - 604"},"PeriodicalIF":0.6,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4469951","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
Spontaneous Four-Photon Mixing in the Formation of Ghost Images 鬼像形成中的自发四光子混合
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-03-11 DOI: 10.1134/S0030400X2213001X
A. V. Belinsky, V. V. Vasilkov
{"title":"Spontaneous Four-Photon Mixing in the Formation of Ghost Images","authors":"A. V. Belinsky,&nbsp;V. V. Vasilkov","doi":"10.1134/S0030400X2213001X","DOIUrl":"10.1134/S0030400X2213001X","url":null,"abstract":"<div><div><p>A generalization of the calculation of the formation of ghost images in the course of backward four-photon mixing to the real situation of non-planar spatially limited pumping, which has a Gaussian profile of the fundamental laser mode, is developed, taking into account the specifics of the formation of ghost images. Computer images have been obtained that make it possible to estimate the spatial resolution of the systems. A relatively simple equivalent scheme for describing the process is proposed, which shows that the effect of diffraction in nonlinear systems is similar to its role in ordinary linear optics with a limited aperture. A fiber-optic version of the formation of ghost images is proposed, suitable for the study of hard-to-reach cavities and organs of the human body, which allow the introduction of a thin fiber bundle there.</p></div></div>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 12","pages":"585 - 592"},"PeriodicalIF":0.6,"publicationDate":"2023-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4471339","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
Investigation of a Surface Layer Formed on Silica Glass as a Result of Mechanical-Chemical and Ionic Polishing 机械化学和离子抛光在二氧化硅玻璃表面形成的表面层的研究
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-02-20 DOI: 10.1134/S0030400X22120050
V. M. Zolotarev
{"title":"Investigation of a Surface Layer Formed on Silica Glass as a Result of Mechanical-Chemical and Ionic Polishing","authors":"V. M. Zolotarev","doi":"10.1134/S0030400X22120050","DOIUrl":"10.1134/S0030400X22120050","url":null,"abstract":"<p>Optical parameters of a surface layer formed on silica glass in the process of polishing are studied. It is shown that the mechanisms of surface layer formation by mechanical-chemical and ionic polishing have much in common. In both cases, the appearance of a surface layer with a refractive index higher than that of the bulk glass is related to stretching and breaking of Si–O–Si bridging bonds due to hydrolysis during glass polishing. The hydrolysis of Si–O–Si bonds occurs with formation of Si–O and Si–OH groups, which leads to an increase in the refractive index of the surface layer.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 11","pages":"573 - 584"},"PeriodicalIF":0.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5084806","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
On the Nonlinear Optics of Ultimately Short Pulses 超短脉冲的非线性光学
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-02-20 DOI: 10.1134/S0030400X22120037
S. V. Sazonov
{"title":"On the Nonlinear Optics of Ultimately Short Pulses","authors":"S. V. Sazonov","doi":"10.1134/S0030400X22120037","DOIUrl":"10.1134/S0030400X22120037","url":null,"abstract":"<p>A short scientific-methodological review of theoretical studies and approaches created in the field of nonlinear optics of ultimately short pulses in the period from 1970s up to now is presented. Important peculiarities making the nonlinear optics of ultimately short pulses different from the nonlinear optics of quasi-monochromatic signals are underscored.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 10","pages":"549 - 558"},"PeriodicalIF":0.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4786811","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: 1
Luminescence of Ag2S/SiO2 Colloidal Quantum Dots Decorated with Small Au Nanoparticles 金纳米粒子修饰Ag2S/SiO2胶体量子点的发光特性
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-02-20 DOI: 10.1134/S0030400X22120025
I. G. Grevtseva, O. V. Ovchinnikov, M. S. Smirnov, T. S. Kondratenko, A. S. Perepelitsa, A. M. H. Hussein
{"title":"Luminescence of Ag2S/SiO2 Colloidal Quantum Dots Decorated with Small Au Nanoparticles","authors":"I. G. Grevtseva,&nbsp;O. V. Ovchinnikov,&nbsp;M. S. Smirnov,&nbsp;T. S. Kondratenko,&nbsp;A. S. Perepelitsa,&nbsp;A. M. H. Hussein","doi":"10.1134/S0030400X22120025","DOIUrl":"10.1134/S0030400X22120025","url":null,"abstract":"<p>A tenfold increase in the quantum yield of defect luminescence in the region of 750 nm with a simultaneous increase in its decay time from 4 to 200 ns, due to decoration of surface of quantum dots (QDs) Ag<sub>2</sub>S/SiO<sub>2</sub> (5.0 ± 1.5 nm) with Au nanoparticles (NPs) (2.0 ± 0.5 nm). Based on analysis of the luminescence kinetics at temperatures of 77 and 300 K, it was concluded that such a nonspecific manifestation of the plasmon–exciton interaction is caused by the influence of polarization effects from Au NPs on the properties of shallow traps involved in the formation of the defect luminescence kinetics of Ag<sub>2</sub>S/SiO<sub>2</sub> QDs.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 11","pages":"567 - 572"},"PeriodicalIF":0.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5084812","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
The Phenomenon of Self-Capture in the Exciton–Polariton System when Pumping the Lower Polariton Branch with Two Laser Pulses with Close Frequencies 用两个频率相近的激光脉冲抽运低极化子分支时激子-极化子系统中的自俘获现象
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-02-20 DOI: 10.1134/S0030400X22120049
O. F. Vasilieva, A. P. Zingan, V. V. Vasiliev
{"title":"The Phenomenon of Self-Capture in the Exciton–Polariton System when Pumping the Lower Polariton Branch with Two Laser Pulses with Close Frequencies","authors":"O. F. Vasilieva,&nbsp;A. P. Zingan,&nbsp;V. V. Vasiliev","doi":"10.1134/S0030400X22120049","DOIUrl":"10.1134/S0030400X22120049","url":null,"abstract":"<p>The dynamics of exciton–polariton states in a semiconductor microresonator has been studied when pumping the state corresponding to the lower polariton branch considering single-mode and intermode elastic polariton–polariton interactions. In this case, the pumping has been carried out by two laser pulses with close frequencies. It has been shown that at the initial phase difference equal to <span>({{theta }_{0}} = pi {text{/2}})</span>, the mode of quantum self-capture of exciton–polaritons is observed. The periodic and aperiodic modes of evolution of a system of quasiparticles have been obtained.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 10","pages":"559 - 565"},"PeriodicalIF":0.6,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4786176","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
On Scenarios of Changing the Optical Properties of the Atmosphere by Aerosol Injection for Climate Stabilization 通过气溶胶注入改变大气光学特性以稳定气候的设想
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-01-31 DOI: 10.1134/S0030400X22110042
S. A. Soldatenko, R. M. Yusupov
{"title":"On Scenarios of Changing the Optical Properties of the Atmosphere by Aerosol Injection for Climate Stabilization","authors":"S. A. Soldatenko,&nbsp;R. M. Yusupov","doi":"10.1134/S0030400X22110042","DOIUrl":"10.1134/S0030400X22110042","url":null,"abstract":"<p>Climate changes have always played an important role in the Earth’s biosphere evolution, but today they occur at a historically high rate. The currently observed climate changes, which have an anthropogenic component, should be systematically counteracted. However, pronounced effects of preventing global warming by developing low-carbon economics and alternative energy sources can hardly be achieved soon. The positive feedback loop of carbon emission has already been started. More efficient and rapid results can be achieved by active geoengineering actions in the atmosphere. Artificial redistribution of heat fluxes of short-wavelength solar radiation by injection of fine reflective aerosols (for example, sulfate aerosols) into the stratosphere is a viable method of climate stabilization. We estimate the effect of aerosol-induced changes in the optical properties of the atmosphere on climate using mathematical models with different degrees of complexity. For this problem, we consider various scenarios depending on the set of parameters and initial conditions. In this work, we consider a conceptual model of formation of climate characteristics of a local ecosystem, the main predictor variable of which is the global mean near-surface air temperature. Using this model, we estimate the effect of artificial aerosol injections on the atmospheric optical properties, which change the solar radiation influx and the temperature regime of the climate system. Our conclusions do not contradict the results of previous investigations. The considered modeling including the estimation of the proposed approach efficiency is a tool for testing various scenarios of aerosol impact on climate. In the future, we intend to develop a model of the influence of climate control on the productivity of water systems and on rapid biological invasions.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 9","pages":"540 - 548"},"PeriodicalIF":0.6,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4052201","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
Processing and Recognition of Two-Coordinate Reference Marks Images in Scanning Probe Microscopy 扫描探针显微镜中二坐标参考标记图像的处理与识别
IF 0.6 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2023-01-31 DOI: 10.1134/S0030400X22110029
P. V. Gulyaev, A. V. Tyurikov, K. S. Ermolin, T. E. Shelkovnikova
{"title":"Processing and Recognition of Two-Coordinate Reference Marks Images in Scanning Probe Microscopy","authors":"P. V. Gulyaev,&nbsp;A. V. Tyurikov,&nbsp;K. S. Ermolin,&nbsp;T. E. Shelkovnikova","doi":"10.1134/S0030400X22110029","DOIUrl":"10.1134/S0030400X22110029","url":null,"abstract":"<p>The article is devoted to the problem of automatic positioning of a scanning probe microscope to a studied region after probe replacement, sample surface treatment, etc. As an auxiliary tool for positioning, it is proposed to use reference marks indicating directions of the probe displacement to the investigated region. The considered pattern of reference marks is a cross. A method of detection of reference marks in the image by analyzing the surface curvature is described. An algorithm of recognition of reference marks based on the structural analysis of positions of singular points (local extrema of curvature) is proposed. Analysis is performed for selected pairs of singular points with specific length and angle of inclination. For selected pairs, parallel transfer parameters are calculated. If reference marks are present in the frame, these parameters are ordered along a straight line, which is a qualitative criterion of recognition of reference marks.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"130 9","pages":"527 - 531"},"PeriodicalIF":0.6,"publicationDate":"2023-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5179261","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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