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Probability of Absorption and Emission by an Atom Interacting with Ultrashort Laser Pulses 原子与超短激光脉冲相互作用的吸收和发射概率
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020012
I. A. Aleksandrov, D. V. Chubukov, N. N. Rosanov
{"title":"Probability of Absorption and Emission by an Atom Interacting with Ultrashort Laser Pulses","authors":"I. A. Aleksandrov,&nbsp;D. V. Chubukov,&nbsp;N. N. Rosanov","doi":"10.1134/S0030400X24020012","DOIUrl":"10.1134/S0030400X24020012","url":null,"abstract":"<p>We consider the process of transition of a two-level system to the excited state with subsequent photon emission in the presence of a laser pulse with a high degree of unipolarity. Within the framework of quantum electrodynamics, we obtain analytical expressions for the differential probability of the process depending on the temporal scales of the problem: laser pulse duration, excited-state lifetime, inverse transition frequency, and inverse frequency of the photon emitted. Besides, we calculate the total absorption probability by integrating over the three-dimensional photon momentum and summing over polarizations. We compare the results obtained for unipolar and bipolar (many-cycle) pulses.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"81 - 85"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968730","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
Optical Properties of Materials for Magnesium Plasmonics Described within DFT+U Approach 用 DFT+U 方法描述镁等离子体材料的光学特性
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020085
V. A. Durymanov, L. A. Avakyan, V. V. Srabionyan, D. S. Rubanik, L. A. Bugaev
{"title":"Optical Properties of Materials for Magnesium Plasmonics Described within DFT+U Approach","authors":"V. A. Durymanov,&nbsp;L. A. Avakyan,&nbsp;V. V. Srabionyan,&nbsp;D. S. Rubanik,&nbsp;L. A. Bugaev","doi":"10.1134/S0030400X24020085","DOIUrl":"10.1134/S0030400X24020085","url":null,"abstract":"<p>The most widely used and applied plasmonic materials, namely silver and gold, has limitations due to their high cost and restriction on the spectral position and shape of the plasmon resonance. This remains true for bimetallic silver–gold nanoparticles. Higher flexibility is required, in particular, for the design of broadband absorbers of light, and for this task the metals other than silver and gold are considered. In this paper we study the optical extinction spectra of alloy and composite nanoparticles containing magnesium and gold. The dielectric properties are calculated within the approximation of independent particles (IPA) based on the electronic structure obtained using density functional theory (DFT) with Hubbard correction (DFT+U). The obtained spectra of optical extinction of magnesium–gold alloy nanoparticles demonstrate that the most sensitive to the composition is the region of wavelengths below 500 nm. Simultaneously, the position of the plasmon resonance predicted by Vegard’s law is higher than obtained from accurate DFT+U based calculations. We managed to describe the experimental optical extinction spectra of the glass sample containing gold and magnesium atoms using the calculated spectra. The results points on the formation of composite nanoparticles with core of Au<sub>3</sub>Mg alloy and shell of Au in the considered sample.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"130 - 138"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931815","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
Assessment of Bilirubin Concentrations in the Bile of Patients with Obstructive Jaundice by Raman Spectroscopy 利用拉曼光谱评估阻塞性黄疸患者胆汁中的胆红素浓度
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020152
E. V. Potapova, V. N. Prizemin, D. S. Sumin, A. V. Mamoshin
{"title":"Assessment of Bilirubin Concentrations in the Bile of Patients with Obstructive Jaundice by Raman Spectroscopy","authors":"E. V. Potapova,&nbsp;V. N. Prizemin,&nbsp;D. S. Sumin,&nbsp;A. V. Mamoshin","doi":"10.1134/S0030400X24020152","DOIUrl":"10.1134/S0030400X24020152","url":null,"abstract":"<p>Raman spectroscopy (RS) is widely used in biomedicine to detect various chemical compounds in substrates, as well as to determine their concentration. In this work, RS was used to detect bilirubin in the hepatic bile of patients with obstructive jaundice (OJ) of different etiologies obtained via a cholangiostomy drainage catheter. The spectral bands of bilirubin (1258–1264 and 1615–1620 cm<sup>–1</sup>) were identified using the excitation wavelength of 785 nm. It was found that the assessment of bilirubin in bile allows to predict the recovery of excretory liver function and the dynamics of convalescence of patients with OJ after biliary decompression.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"179 - 187"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931825","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
Participation of Defects Localized at Heterointerfaces and Extended Defects in the Degradation of Nitride-Based Light-Emitting Devices 异质界面局部缺陷和扩展缺陷对氮化物发光器件降解的影响
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020176
N. A. Talnishnikh, A. E. Ivanov, E. I. Shabunina, N. M. Shmidt
{"title":"Participation of Defects Localized at Heterointerfaces and Extended Defects in the Degradation of Nitride-Based Light-Emitting Devices","authors":"N. A. Talnishnikh,&nbsp;A. E. Ivanov,&nbsp;E. I. Shabunina,&nbsp;N. M. Shmidt","doi":"10.1134/S0030400X24020176","DOIUrl":"10.1134/S0030400X24020176","url":null,"abstract":"<p>A decrease in external quantum efficiency (EQE) of commercial LEDs based on MQW InGaN/GaN at wavelengths of 445, 530 and MQW AlGaN/GaN at 280 nm was experimentally studied in the standard aging mode at direct current. The decrease in EQE (regardless of the radiation wavelength) is found out to occur due to cooperative phenomena developing in 1–2 quantum wells (QWs) located in the space charge region (SCR) around the <i>p</i>–<i>n</i> junction, as well as in most of the QWs outside of SCR. It is shown that the inhomogeneous flow of current in these regions leads not only to the transformation of defects localized at heteroboundaries in the SCR and in lateral inhomogeneities in the alloy composition outside of SCR as well as in the extended defects, but also to a change in the alloy composition.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"193 - 195"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931819","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
Chemiluminescent Hydrogen Peroxide Sensor Based on Luminol and a Colloidal Solution of Metal Nanoparticles 基于鲁米诺和金属纳米颗粒胶体溶液的过氧化氢化学发光传感器
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020188
N. A. Virts, D. R. Dadadzhanov, A. S. Yablokov, D. V. Shershnev, T. A. Vartanyan
{"title":"Chemiluminescent Hydrogen Peroxide Sensor Based on Luminol and a Colloidal Solution of Metal Nanoparticles","authors":"N. A. Virts,&nbsp;D. R. Dadadzhanov,&nbsp;A. S. Yablokov,&nbsp;D. V. Shershnev,&nbsp;T. A. Vartanyan","doi":"10.1134/S0030400X24020188","DOIUrl":"10.1134/S0030400X24020188","url":null,"abstract":"<p>The effect of gold and silver nanoparticles with plasmon resonance on the chemiluminescence of luminol in an oxidizing environment was studied. It has been shown that when a colloidal solution of metal nanoparticles is added to luminol, the intensity of chemiluminescence caused by the presence of hydrogen peroxide and sodium hypochlorite increases and can be easily recorded at a pH level characteristic of biological media close to neutral, at which chemiluminescence is weak in the absence of metal nanoparticles.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"196 - 199"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931821","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
Formation of Silver Nanoparticles Oligomers Obtained via Laser Ablation in a Liquid by Sequential Centrifugation and Ultrasonication: Tunable Long-Wavelength Shift of Plasmon Resonance for Biomedical Applications 通过顺序离心和超声处理在液体中形成激光烧蚀银纳米粒子低聚物：用于生物医学应用的可调谐等离子体共振长波长位移
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020061
D. R. Dadadzhanov, A. V. Palekhova, G. Alexan, M. A. Baranov, N. A. Maslova
{"title":"Formation of Silver Nanoparticles Oligomers Obtained via Laser Ablation in a Liquid by Sequential Centrifugation and Ultrasonication: Tunable Long-Wavelength Shift of Plasmon Resonance for Biomedical Applications","authors":"D. R. Dadadzhanov,&nbsp;A. V. Palekhova,&nbsp;G. Alexan,&nbsp;M. A. Baranov,&nbsp;N. A. Maslova","doi":"10.1134/S0030400X24020061","DOIUrl":"10.1134/S0030400X24020061","url":null,"abstract":"<p>A relatively simple physical method has been proposed for fabrication of stable oligomers of silver nanoparticles, preliminarily obtained by pulsed laser ablation of a metal target in a liquid. Oligomers of silver nanoparticles are formed in an aqueous solution after prolonged centrifugation at 18 000<i>g</i> and subsequent ultrasonication of the initial colloidal solution of spherical nanoparticles obtained by laser ablation. The plasmon resonance in oligomers is shifted relative to the plasmon resonance in spherical nanoparticles to the long wavelength region by 140 nm.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"118 - 125"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931841","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
Simulation of the Interaction of NiO with a Graphene Layer in a NiOx/CNT Composite Based on XANES Spectroscopy 基于 XANES 光谱模拟 NiOx/CNT 复合材料中 NiO 与石墨烯层的相互作用
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020073
V. O. Dmitriev, V. A. Shmatko, I. V. Ershov, E. S. Stebletsova, G. E. Yalovega
{"title":"Simulation of the Interaction of NiO with a Graphene Layer in a NiOx/CNT Composite Based on XANES Spectroscopy","authors":"V. O. Dmitriev,&nbsp;V. A. Shmatko,&nbsp;I. V. Ershov,&nbsp;E. S. Stebletsova,&nbsp;G. E. Yalovega","doi":"10.1134/S0030400X24020073","DOIUrl":"10.1134/S0030400X24020073","url":null,"abstract":"<p>The interaction of NiO clusters with a graphene layer of a nanotube in NiO<sub><i>x</i></sub>/CNT composites is simulated based on a theoretical analysis of Ni <i>K</i>-edge XANES spectra. Various cases of orientation of crystallographic planes relative to the nanotube wall are considered. It was determined that Ni in the composite is predominantly in the 2+ state, NiO particles are oriented towards the tube wall by the (200) plane. Accounting for carbon atoms even in the first sphere of the nickel environment makes it possible to achieve good agreement between the theoretical spectrum and experiment.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"126 - 129"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931843","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
Volume Transmission Holograms in Lithium Niobate Crystals with Surface Copper Doping for Photovoltaic Tweezers 用于光伏镊子的表面掺铜铌酸锂晶体体透射全息图
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020024
R. I. Anisimov, A. S. Temereva, A. A. Kolmakov, S. M. Shandarov
{"title":"Volume Transmission Holograms in Lithium Niobate Crystals with Surface Copper Doping for Photovoltaic Tweezers","authors":"R. I. Anisimov,&nbsp;A. S. Temereva,&nbsp;A. A. Kolmakov,&nbsp;S. M. Shandarov","doi":"10.1134/S0030400X24020024","DOIUrl":"10.1134/S0030400X24020024","url":null,"abstract":"<p>The results of experimental studies, theoretical analysis and numerical simulations of the features of the volume transmission holograms' formation by the interference pattern of laser beams with high contrast in the <i>X</i>-cut LiNbO<sub>3</sub>:Cu, fabricated by diffusion from a metal film, are presented. Analytic formulas that take the inhomogeneities of the distribution of copper ions and the absorption index of recording beams over the thickness of the sample into account are derived to describe the time evolution of the amplitude of the first spatial harmonic of the field. The material parameters of the LiNbO<sub>3</sub>:Cu structure are estimated. A comparative analysis of the spatial distribution of the amplitude of the first harmonic of the photorefractive hologram’s field in two types of LiNbO<sub>3</sub>:Cu structures is performed. We concluded that it is necessary to use <i>X</i>‑cut LiNbO<sub>3</sub>:Cu diffusion structures characterized by similar distributions of impurity centers, which maximums are localized near the boundary used to capture micro- and nanoparticles, for the implementation of photovoltaic tweezers.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"86 - 94"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141968729","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
Phonons and Features Due to Ionic Conductivity in the Reflection Spectra of BiF3 Crystal BiF3 晶体反射光谱中的声子和离子导电性特征
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020139
A. D. Molchanova, S. A. Klimin, V. A. Chernyshev, K. N. Boldyrev, A. R. Valiev, D. N. Karimov
{"title":"Phonons and Features Due to Ionic Conductivity in the Reflection Spectra of BiF3 Crystal","authors":"A. D. Molchanova,&nbsp;S. A. Klimin,&nbsp;V. A. Chernyshev,&nbsp;K. N. Boldyrev,&nbsp;A. R. Valiev,&nbsp;D. N. Karimov","doi":"10.1134/S0030400X24020139","DOIUrl":"10.1134/S0030400X24020139","url":null,"abstract":"<p>Crystals of bismuth fluoride BiF<sub>3</sub> grown from a melt were studied for the first time by optical spectroscopy methods and calculated from first principles in the phonon excitations region. A study of IR reflectance spectra in polarized light was carried out. The parameters of optical phonons were obtained. In the IR reflectance spectra, a low-frequency rise in the range &lt;500 cm<sup>–1</sup>, characteristic of conductive materials, is observed. The reflection spectra were analyzed within the framework of the Drude–Lorentz model, taking into account the contribution of ionic conductivity. An ab initio calculation of the phonon spectrum of a BiF<sub>3</sub> crystal was carried out and the relationship between theoretical and experimental data was analyzed.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"170 - 174"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931817","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
Rotation Angle Sensor Based on a One-Dimensional Photonic Crystal with a Defect 基于带有缺陷的一维光子晶体的旋转角度传感器
IF 0.8 4区 物理与天体物理
Optics and Spectroscopy Pub Date : 2024-08-07 DOI: 10.1134/S0030400X24020164
A. I. Sidorov, A. A. Efimov
{"title":"Rotation Angle Sensor Based on a One-Dimensional Photonic Crystal with a Defect","authors":"A. I. Sidorov,&nbsp;A. A. Efimov","doi":"10.1134/S0030400X24020164","DOIUrl":"10.1134/S0030400X24020164","url":null,"abstract":"<p>The results of numerical simulation of the optical properties of a one-dimensional (1D) photonic crystal with a defect based on semiconductor-dielectric layers in the near-IR range are presented. The simulations used layers of silicon and silicon dioxide with optical thicknesses 3λ/4, λ/4 and 10λ/4. The influence of radiation incident angle on the spectral position of the defect’s guidance band has been studied. It is shown that the sensitivity to the rotation angle lies within the limits of 6–20 nm/deg and 1.7–5.5 dB/deg, depending on the geometry of the sensor and the measurement method. This makes these photonic crystals promising for use in the rotation angle sensors as a sensitive element.</p>","PeriodicalId":723,"journal":{"name":"Optics and Spectroscopy","volume":"132 2","pages":"188 - 192"},"PeriodicalIF":0.8,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931822","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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