Optics and Spectroscopy最新文献

{"title":"Phonon Spectrum and Elastic Properties of Y2Sn2O7","authors":"V. A. Chernyshev,&nbsp;K. I. Glukhov,&nbsp;P. A. Agzamova","doi":"10.1134/S0030400X21080051","DOIUrl":"10.1134/S0030400X21080051","url":null,"abstract":"<p>The phonon spectrum of yttrium stannate Y₂Sn₂O₇ is calculated within a general ab initio approach and the frequencies and types of IR and Raman modes are determined. The degree of involvement of ions in phonon modes is determined from the analysis of displacement vectors calculated ab initio. The elastic constants and hardness of Y₂Sn₂O₇ are calculated. The impurity ion–ligand distance in Y₂Sn₂O₇:Yb³⁺, Y₂Sn₂O₇:Eu³⁺, Lu₂Sn₂O₇:Yb³⁺, Nd₂Sn₂O₇:Gd³⁺, and Nd₂Sn₂O₇:Tb³⁺ impurity centers is calculated.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 10","pages":"1074 - 1083"},"PeriodicalIF":0.6,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4818869","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":"Single- and Double-Beam Optical Formation of Relief-Phase Diffraction Microstructures in Carbazole-Containing Azopolymer Films","authors":"N. A. Ivliev,&nbsp;V. V. Podlipnov,&nbsp;S. N. Khonina,&nbsp;K. S. Loshmanskii,&nbsp;A. M. Prisakar,&nbsp;V. G. Abashkin,&nbsp;A. Yu. Meshalkin,&nbsp;E. A. Akimova","doi":"10.1134/S0030400X21040111","DOIUrl":"10.1134/S0030400X21040111","url":null,"abstract":"<p>Single- and double-beam formation of diffraction microstructures in carbazole-containing azopolymer films is presented. The possibility of recording single microroughnesses by a focused vortex laser beam with linear and circular polarization is shown. The analysis of the relief shape microstructures on the state of polarization. A double-beam method of creation of diffraction lattices is presented, in which a spatial light modulator is used for the formation of the vortex phase. The evaluation of the diffraction efficiency of the formed periodic optical structures on the duration of the exposure is performed.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 4","pages":"489 - 494"},"PeriodicalIF":0.6,"publicationDate":"2022-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4818873","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":"Key Factors for Tuning Au Self-Assembling SERS Films: from Properties to Structure","authors":"K. A. Khnykina,&nbsp;M. A. Baranov,&nbsp;A. A. Babaev,&nbsp;A. V. Baranov,&nbsp;K. V. Bogdanov","doi":"10.1134/S0030400X21040123","DOIUrl":"10.1134/S0030400X21040123","url":null,"abstract":"<p>We studied self-assembled plasmonic films (SPF) based on gold nanoparticles (Au-NPs). We recorded the intensity distribution maps (IDM) with an area of 2025 μm² (9 × 9 points). We have observed uniform enhancement across the entire surface of SPF. Therefore, we used the parameters average intensity of IDM and IDM gate when we optimized the synthesis of SPF. Average intensity is the average intensity value over 81 spectra of the IDM. The gate is the span excluding 10% of the outliers. We have discovered that the maximum average intensity was observed at a concentration of 1.00 × 10^–5 M. A decrease in the concentration of Au-NPs leads to a decrease in the average intensity. A simultaneous decrease in TOABr and A-u‑NPs concentration also leads to a decrease in the average intensity. The film obtained by the optimal synthesis method was characterized using SEM and AFM.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 4","pages":"495 - 504"},"PeriodicalIF":0.6,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4418250","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":"Key Factors for Tuning Au Self-Assembling SERS Films: from Properties to Structure","authors":"K. A. Khnykina, M. Baranov, A. A. Babaev, A. V. Baranov, K. Bogdanov","doi":"10.21883/OS.2021.04.50779.1062-20","DOIUrl":"https://doi.org/10.21883/OS.2021.04.50779.1062-20","url":null,"abstract":"Abstract We studied self-assembled plasmonic films (SPF) based on gold nanoparticles (Au-NPs). We recorded the intensity distribution maps (IDM) with an area of 2025 μm 2 (9 × 9 points). We have observed uniform enhancement across the entire surface of SPF. Therefore, we used the parameters average intensity of IDM and IDM gate when we optimized the synthesis of SPF. Average intensity is the average intensity value over 81 spectra of the IDM. The gate is the span excluding 10% of the outliers. We have discovered that the maximum average intensity was observed at a concentration of 1.00 × 10 –5 M. A decrease in the concentration of Au-NPs leads to a decrease in the average intensity. A simultaneous decrease in TOABr and A-u‑NPs concentration also leads to a decrease in the average intensity. The film obtained by the optimal synthesis method was characterized using SEM and AFM.","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"1 1","pages":"1-10"},"PeriodicalIF":0.6,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43278697","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":"Strong Interference Luminescence of Mixed Modes in the Neighborhood of the Critical Value of Exciton Decay","authors":"B. Zh. Akhmadaliev,&nbsp;N. Kh. Yuldashev","doi":"10.1134/S0030400X21090022","DOIUrl":"10.1134/S0030400X21090022","url":null,"abstract":"<p>The results of a numerical calculation of the dispersion and luminescence spectra of mixed exciton modes of crystals of the CdS (<span>({{A}_{{n = 1}}})</span>) type are analyzed depending on the decay <span>(Gamma )</span> of mechanical excitons and the angle <span>(theta )</span> of emission of radiation into vacuum in the vicinity of the critical values <span>({{Gamma }_{c}})</span> and <span>({{theta }_{c}})</span>. It is shown that the mechanism of <span>({{A}_{L}})</span> line formation depends significantly on the value of the light–exciton interaction parameter <span>({{tilde {omega }}_{{LT}}}left( {{{theta }_{c}}} right){text{/}}{{Gamma }_{c}})</span>, the superposition of <i>M</i>1 and <i>M</i>2 waves with strongly asymmetric <span>({{I}_{{M1}}}(omega ))</span>, <span>({{I}_{{M2}}}(omega ))</span>, and symmetric <span>({{I}_{{12}}}(omega ))</span> contours forms an almost symmetric resulting spectral contour <span>(Ileft( omega right))</span> with a maximum at the critical frequency <span>({{omega }_{c}})</span>.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 11","pages":"1187 - 1192"},"PeriodicalIF":0.6,"publicationDate":"2022-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4417963","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":"Study of the Photocatalytic Antimicrobial Activity of Nanocomposites Based on TiO2–Al2O3 under Action of LED Radiation (405 nm) on Staphylococci","authors":"A. V. Svetlakova,&nbsp;M. Sanchez Mendez,&nbsp;E. S. Tuchin,&nbsp;A. N. Khodan,&nbsp;M. Traore,&nbsp;R. Azouani,&nbsp;A. Kanaev,&nbsp;V. V. Tuchin","doi":"10.1134/S0030400X21060175","DOIUrl":"10.1134/S0030400X21060175","url":null,"abstract":"<p>We study the photocatalytic activity of nanocomposites based on θ-phase alumina (Al₂O₃) with different TiO₂ concentrations for heterogeneous photocatalysis and biodestruction of pathogenic microorganisms under action of LED radiation with a wavelength of 405 nm. It is found that all studied nanocomposites have photocatalytic activity. The maximum antibacterial activity (a decrease in the CFU of <i>Staphylococcus aureus</i> 209 P to 86%) is observed for composites with a TiO₂ concentration of 8 wt %, which allows us to recommend this nanomaterial as a promising antimicrobial coating.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 8","pages":"846 - 850"},"PeriodicalIF":0.6,"publicationDate":"2022-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5178333","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":"Synthesis of Nanosized Luminophores Gd2O3:Nd3+ by Polymer-Salt Method and Study of Their Main Characteristics","authors":"A. S. Matrosova,&nbsp;N. K. Kuz’menko,&nbsp;S. K. Evstrop’ev,&nbsp;V. A. Aseev,&nbsp;D. P. Danilovich,&nbsp;N. V. Nikonorov,&nbsp;A. I. Ignat’ev,&nbsp;V. V. Demidov,&nbsp;K. V. Dukel’skii","doi":"10.1134/S0030400X21050106","DOIUrl":"10.1134/S0030400X21050106","url":null,"abstract":"<p>The problems of manufacturing nanoscale Gd₂O₃:Nd³⁺ phosphors using the liquid polymer-salt method have been considered. Within the framework of this method, the dual role of polyvinylpyrrolidone (PVP) as an organic solvent in the synthesis process has been determined. On the one hand, it stabilizes the formation of Gd₂O₃ crystals, preventing their uncontrolled growth and agglomeration, and on the other, it serves as a fuel during decomposition (combustion), contributing to an increase in the reaction temperature and thereby influencing the structural and emission properties of phosphors. It has been shown that successive drying of the initial homogeneous solution containing gadolinium and neodymium salts, as well as PVP, at room temperature for 24 h and heat treatment at 1000°C for 2 h make it possible to obtain high-luminescent near-infrared phosphors Gd₂O₃:Nd³⁺, whose crystals are characterized mainly by a cubic structure and an average size of about 40 nm. It has been experimentally confirmed that the developed method is suitable for modifying hollow-core antiresonant optical fibers made of silica glass with thin-film coatings based on the synthesized material and does not cause structural and phase transformation of the formed Gd₂O₃ crystals. It has been found out that the emission spectra of the nanoscale Gd₂O₃:Nd³⁺ phosphors obtained by the polymer-salt method at temperatures of 550 and 1000°C are identical, namely: (1) the shape of the luminescence peaks is the same for both specified heat treatment regimes regardless of intensity, (2) the main lum-inescence peak is located near 1064 nm wavelength and corresponds to the electron transition ⁴<i>F</i>_3/2–⁴<i>I</i>_11/2, and (3) additional luminescence peaks are located near 900 and 1340 nm wavelengths and correspond to the ⁴<i>F</i>_3/2–⁴<i>I</i>_9/2 and ⁴<i>F</i>_3/2–⁴<i>I</i>_13/2 electron transitions, respectively.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 6","pages":"662 - 669"},"PeriodicalIF":0.6,"publicationDate":"2022-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5338728","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":"Optical Characteristics of a Europium-Doped Barium Titanate Inhomogeneous Layer","authors":"N. I. Staskov,&nbsp;A. B. Sotsky,&nbsp;L. I. Sotskaya,&nbsp;N. V. Gaponenko,&nbsp;E. I. Lashkovskaya,&nbsp;A. N. Petlitskii,&nbsp;A. A. Kozlov","doi":"10.1134/S0030400X21040263","DOIUrl":"10.1134/S0030400X21040263","url":null,"abstract":"<p>An algorithm for solving the inverse problem of multiangle spectrophotometry of an inhomogeneous absorbing film is developed, which is based on polynomial representations of the density of the film material and its complex refraction coefficient. The algorithm is applied to determine the spectral and spatial distributions of the refractive index and absorption coefficient of a barium titanate film doped with europium. The film is deposited on a silicon dioxide layer on a silicon substrate using a sol–gel technology. The correctness of the obtained solution is verified by comparing the calculated and measured spectra of ellipsometric angles and the spectra of reflectance of the structure at normal incidence of light. Doping of barium titanate with europium leads to a decrease in the wavelength corresponding to the intrinsic absorption band edge, an increase in the band gap width of the material in the near-surface layer of the film, and a decrease in the concentration of europium deep into the film.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 5","pages":"586 - 591"},"PeriodicalIF":0.6,"publicationDate":"2022-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4789887","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":"Dependences of the Optical Absorption Spectra and Refractive Index of Rhodamine B in Molecular Form Immobilized in a Polymer Film on the Concentration of Lead Ions in Water","authors":"I. Yu. Denisyuk,&nbsp;A. A. Rybikov,&nbsp;Yu. A. Ignat’eva","doi":"10.1134/S0030400X21040081","DOIUrl":"10.1134/S0030400X21040081","url":null,"abstract":"<p>The dependences of the adsorption and refractometric parameters of a polymer composition containing Rhodamine B in the molecular state on the concentration of lead atoms are studied. These dependences are used as a basis of an express-method of determining the concentration of lead ions in water, the sensitivity of which is shown to be as high as 0.001 mg/L, which is below the maximum permissible concentration. The use of the water-insoluble dye as a material sensitive to lead ions shows the possibility of developing a stable sensor based on the effect under study. The use of the frustrated total internal reflection method for determining the lead concentration by the aforementioned optical parameters is considered.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 4","pages":"471 - 475"},"PeriodicalIF":0.6,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4421018","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":"Collisions of Lithium Atoms in Ground State. Complex Spin-Exchange Cross Sections","authors":"V. A. Kartoshkin","doi":"10.1134/S0030400X21050076","DOIUrl":"10.1134/S0030400X21050076","url":null,"abstract":"<p>Interaction of two polarized lithium atoms (⁷Li) is analyzed. When such atoms collide with each other, spin exchange, i.e., an exchange of electron polarization between colliding atoms, takes place in addition to elastic scattering. Simultaneously with polarization transfer, spin exchange leads to frequency shift of the magnetic resonance of colliding atoms. Based on the data on potentials describing interaction between two lithium atoms, energy dependences of spin-exchange cross section and cross section of frequency shift of magnetic resonance are calculated for the first time.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"129 6","pages":"641 - 644"},"PeriodicalIF":0.6,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4006358","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}