Pub Date : 2023-02-28DOI: 10.21883/OS.2023.03.55379.4569-22
N. Dulaev, M. Y. Kaygorodov, A. Malyshev, I. Tupitsyn, V. Shabaev
For heliumlike uranium, the energies of the singly-excited 1sns, 1snp, and 1snd states with n ≤ 4 and the probabilities of the one-photon 1s3d -> 1s2p, 1s3p -> 1s2s, 1s3p -> 1s2p and 1s4d -> 1s2p transitions are evaluated. The calculations are performed within the Breit approximation using the configuration-interaction method in the basis of the Dirac-Fock-Sturm orbitals. The QED corrections to the energy levels are calculated employing the model-QED-operator approach. The nuclear recoil, frequency-dependent Breit-interaction, nuclear polarization, and nuclear deformation corrections are taken into account as well.
{"title":"Релятивистские расчеты энергий низко возбужденных состояний 1sns, 1snp, 1snd и вероятностей однофотонных переходов 1snl -> 1sn'l' в гелиеподобном ионе урана","authors":"N. Dulaev, M. Y. Kaygorodov, A. Malyshev, I. Tupitsyn, V. Shabaev","doi":"10.21883/OS.2023.03.55379.4569-22","DOIUrl":"https://doi.org/10.21883/OS.2023.03.55379.4569-22","url":null,"abstract":"\u0000 For heliumlike uranium, the energies of the singly-excited 1sns, 1snp, and 1snd states with n ≤ 4 and the probabilities of the one-photon 1s3d -> 1s2p, 1s3p -> 1s2s, 1s3p -> 1s2p and 1s4d -> 1s2p transitions are evaluated. The calculations are performed within the Breit approximation using the configuration-interaction method in the basis of the Dirac-Fock-Sturm orbitals. The QED corrections to the energy levels are calculated employing the model-QED-operator approach. The nuclear recoil, frequency-dependent Breit-interaction, nuclear polarization, and nuclear deformation corrections are taken into account as well.\u0000","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91292194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.07.56126.4318-23
А. Г. Белов, Е. В. Молодцова, С.С. Кормилицина, Р. И. Козлов, Е.О. Журавлев, Степан Андреевич Климин, Надежда Николаевна Новикова, В. А. Яковлев
A method is proposed for separately determining the concentrations of "light" and "heavy" electrons in n-GaSb. It is based on the analysis of reflection spectra in the far infrared region, taking into account the plasmon-phonon coupling. Calibration curves have been calculated that allow one to determine the concentrations of "light" and "heavy" electrons in GaSb using the frequency of high-energy coupled plasmon-phonon mode. For a series of n-GaSb samples the reflection spectra were measured and the concentrations of "light" and "heavy" electrons were determined at room temperature. Electrophysical Van der Paw measurements have been performed on the same samples at room temperature. By comparing the optical and Hall data, the ratios of the mobilities of "light" and "heavy" electrons (parameter b) were determined. This method of determining the value of the parameter b is used for the first time.
{"title":"Определение концентрации электронов проводимости в монокриcталлических образцах n-GaSb по спектрам отражения в дальней инфракрасной области при T=295 K","authors":"А. Г. Белов, Е. В. Молодцова, С.С. Кормилицина, Р. И. Козлов, Е.О. Журавлев, Степан Андреевич Климин, Надежда Николаевна Новикова, В. А. Яковлев","doi":"10.21883/os.2023.07.56126.4318-23","DOIUrl":"https://doi.org/10.21883/os.2023.07.56126.4318-23","url":null,"abstract":"A method is proposed for separately determining the concentrations of \"light\" and \"heavy\" electrons in n-GaSb. It is based on the analysis of reflection spectra in the far infrared region, taking into account the plasmon-phonon coupling. Calibration curves have been calculated that allow one to determine the concentrations of \"light\" and \"heavy\" electrons in GaSb using the frequency of high-energy coupled plasmon-phonon mode. For a series of n-GaSb samples the reflection spectra were measured and the concentrations of \"light\" and \"heavy\" electrons were determined at room temperature. Electrophysical Van der Paw measurements have been performed on the same samples at room temperature. By comparing the optical and Hall data, the ratios of the mobilities of \"light\" and \"heavy\" electrons (parameter b) were determined. This method of determining the value of the parameter b is used for the first time.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"141 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75695730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.04.55545.64-22
Валерий Сергеевич Запасский
Spin fluctuation spectroscopy (SNS) is a conceptually new version of magnetic resonance spectroscopy, experimentally demonstrated in 1981 and strongly developed in the last two decades. Atomic systems and semiconductors served as main objects of the SNS. It became possible to apply SNS to crystals with rare-earth impurities - classical objects of EPR spectroscopy and the subject of constant interest of P.P. Feofilov, only in recent years, due to specific combination of spectroscopic properties of rare-earth ions with characteristics of the stochastic signal formation in SNS. In this article, we consider the specific characteristics of application of SNS to crystals with rare-earth ions and briefly describe the results of experimental studies, which made it possible to significantly expand the scope of possibilities of this method.
{"title":"Спектроскопия спиновых флуктуаций редкоземельных ионов в кристаллах","authors":"Валерий Сергеевич Запасский","doi":"10.21883/os.2023.04.55545.64-22","DOIUrl":"https://doi.org/10.21883/os.2023.04.55545.64-22","url":null,"abstract":"Spin fluctuation spectroscopy (SNS) is a conceptually new version of magnetic resonance spectroscopy, experimentally demonstrated in 1981 and strongly developed in the last two decades. Atomic systems and semiconductors served as main objects of the SNS. It became possible to apply SNS to crystals with rare-earth impurities - classical objects of EPR spectroscopy and the subject of constant interest of P.P. Feofilov, only in recent years, due to specific combination of spectroscopic properties of rare-earth ions with characteristics of the stochastic signal formation in SNS. In this article, we consider the specific characteristics of application of SNS to crystals with rare-earth ions and briefly describe the results of experimental studies, which made it possible to significantly expand the scope of possibilities of this method.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78744008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.02.55003.19-23
М В Чащин, П. А. Щеглов, А.А. Таусенев, Михаил Михайлович Назаров, В.М. Гордиенко
The dependence of the visible spectrum (harmonics 2 and 3/2) and the output of Cu K-alpha X-ray radiation on the energy and duration of subrelativistic intensity femtosecond laser pulse acting on a copper foil is investigated. It was found that for secondary radiation, the determining factor is the energy density, and not the intensity and duration of the pulse. The power-law dependencies of the secondary output radiation on the duration and the pulse energy have a significantly different indicator. The tendencies of changing the shape of the spectrum for regions dominated by various mechanisms of plasma heating are revealed.
研究了作用在铜箔上的亚相对论性强飞秒激光脉冲的能量和持续时间对可见光谱(2次谐波和3/2次谐波)和Cu k - α x射线输出的影响。研究发现，二次辐射的决定因素是能量密度，而不是脉冲的强度和持续时间。二次输出辐射对持续时间和脉冲能量的幂律依赖性有明显不同的指标。揭示了各种等离子体加热机制主导区域光谱形状变化的趋势。
{"title":"Спектры оптических гармоник 2 и 3/2 при субрелятивистской лазерно-плазменной генерации рентгеновского излучения","authors":"М В Чащин, П. А. Щеглов, А.А. Таусенев, Михаил Михайлович Назаров, В.М. Гордиенко","doi":"10.21883/os.2023.02.55003.19-23","DOIUrl":"https://doi.org/10.21883/os.2023.02.55003.19-23","url":null,"abstract":"The dependence of the visible spectrum (harmonics 2 and 3/2) and the output of Cu K-alpha X-ray radiation on the energy and duration of subrelativistic intensity femtosecond laser pulse acting on a copper foil is investigated. It was found that for secondary radiation, the determining factor is the energy density, and not the intensity and duration of the pulse. The power-law dependencies of the secondary output radiation on the duration and the pulse energy have a significantly different indicator. The tendencies of changing the shape of the spectrum for regions dominated by various mechanisms of plasma heating are revealed.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"58 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84567242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.04.55553.70-22
А. С. Москвин
An analysis of the optical properties of compounds based on 3d elements provides valuable information about the electronic structure of the ground state and low-energy excitations. Thus, we show that the analysis of charge-transfer d-d excitons in the dielectric antiferromagnetic phase of cuprates and metastable low-energy electron-hole EH dimers being a result of their evolution after electron-lattice relaxation, turns out to be very fruitful not only for describing linear and nonlinear optical properties and photoinduced effects, but also to develop a promising model of charge triplets to describe the low-energy electronic structure and T-x phase diagrams of active CuO2 planes in cuprates of the T-La2CuO4 or T’-Nd2CuO4 type, as well as NiO2 planes in nickelates of the RNiO2 type, and their evolution with changes in the main energy parameters.
{"title":"Экситоны с переносом заряда в ВТСП купратах и никелатах","authors":"А. С. Москвин","doi":"10.21883/os.2023.04.55553.70-22","DOIUrl":"https://doi.org/10.21883/os.2023.04.55553.70-22","url":null,"abstract":"An analysis of the optical properties of compounds based on 3d elements provides valuable information about the electronic structure of the ground state and low-energy excitations. Thus, we show that the analysis of charge-transfer d-d excitons in the dielectric antiferromagnetic phase of cuprates and metastable low-energy electron-hole EH dimers being a result of their evolution after electron-lattice relaxation, turns out to be very fruitful not only for describing linear and nonlinear optical properties and photoinduced effects, but also to develop a promising model of charge triplets to describe the low-energy electronic structure and T-x phase diagrams of active CuO2 planes in cuprates of the T-La2CuO4 or T’-Nd2CuO4 type, as well as NiO2 planes in nickelates of the RNiO2 type, and their evolution with changes in the main energy parameters.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77222343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.04.55554.57-22
Л. Э. Гончарь
The magnetic resonance spectra of frustrated manganite compounds La1/3Ca2/3MnO3 and BiMnO3 are calculated within the framework of orbitally dependent magnetic interactions model. The aim of the paper is an investigation of orbital structure influence and superexchange interactions’ competition effects on ferromagnetic or antiferromagnetic resonance spectra of these compounds. The description of the features of the resonance lower branches’ dependencies on the magnitude and direction of the magnetic field is proposed. It is shown that the main influence on the symmetry of dependencies is exerted by single-ion anisotropy of the Mn3+ ion, associated not only with the orbital structure, but also with the tilting distortions of oxygen octahedrons around the ions
{"title":"Теоретическое исследование магнитно-резонансных спектров псевдоперовскитных фрустрированных манганитов","authors":"Л. Э. Гончарь","doi":"10.21883/os.2023.04.55554.57-22","DOIUrl":"https://doi.org/10.21883/os.2023.04.55554.57-22","url":null,"abstract":"The magnetic resonance spectra of frustrated manganite compounds La1/3Ca2/3MnO3 and BiMnO3 are calculated within the framework of orbitally dependent magnetic interactions model. The aim of the paper is an investigation of orbital structure influence and superexchange interactions’ competition effects on ferromagnetic or antiferromagnetic resonance spectra of these compounds. The description of the features of the resonance lower branches’ dependencies on the magnitude and direction of the magnetic field is proposed. It is shown that the main influence on the symmetry of dependencies is exerted by single-ion anisotropy of the Mn3+ ion, associated not only with the orbital structure, but also with the tilting distortions of oxygen octahedrons around the ions","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"97 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85377854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.06.55912.124-23
Е.М. Трифанова, Марина Юрьевна Николаева, А. П. Свиридов, Владимир Карпович Попов
Phantoms are often used to imitate biological tissues in laboratory conditions. Phantoms are usually made on the basis of natural and synthetic materials, as well as hydrogels and various bioactive compositions. Today to visualize biological tissues and study the processes occurring to them in in vitro and in vivo researches in real time, upconversion nanophosphors (UCNPs) are actively used. They have a whole set of unique photoluminescent properties and are promising components of modern tools for non-invasive optical diagnostics of the human and animals body. We have carried out the synthesis and complex characterization of β-NaYF4:Yb3+:Er3+/NaYF4 nanoparticles, which effectively convert radiation from the near-IR range into the visible region of the spectrum. The process has been developed to encapsulate them into the structure of aliphatic polyesters and to form bioresorbable polylactoglycolide scaffolds by anti-solvent 3D printing. We formed two types of tissue phantoms based on agarose, ultra-pasteurized cow's milk and melanin. Characterization and analysis of their optical properties were carried out. We studied the transformations of the photoluminescence spectrum of the synthesized UCNPs during the passage of their radiation through these phantoms, and performed the visualization of the photoluminescent polyester matrices placed in them.
{"title":"Трансформации спектров фотолюминесценции наноразмерных апконвертирующих фосфоров фантомами биологических тканей","authors":"Е.М. Трифанова, Марина Юрьевна Николаева, А. П. Свиридов, Владимир Карпович Попов","doi":"10.21883/os.2023.06.55912.124-23","DOIUrl":"https://doi.org/10.21883/os.2023.06.55912.124-23","url":null,"abstract":"Phantoms are often used to imitate biological tissues in laboratory conditions. Phantoms are usually made on the basis of natural and synthetic materials, as well as hydrogels and various bioactive compositions. Today to visualize biological tissues and study the processes occurring to them in in vitro and in vivo researches in real time, upconversion nanophosphors (UCNPs) are actively used. They have a whole set of unique photoluminescent properties and are promising components of modern tools for non-invasive optical diagnostics of the human and animals body. We have carried out the synthesis and complex characterization of β-NaYF4:Yb3+:Er3+/NaYF4 nanoparticles, which effectively convert radiation from the near-IR range into the visible region of the spectrum. The process has been developed to encapsulate them into the structure of aliphatic polyesters and to form bioresorbable polylactoglycolide scaffolds by anti-solvent 3D printing. We formed two types of tissue phantoms based on agarose, ultra-pasteurized cow's milk and melanin. Characterization and analysis of their optical properties were carried out. We studied the transformations of the photoluminescence spectrum of the synthesized UCNPs during the passage of their radiation through these phantoms, and performed the visualization of the photoluminescent polyester matrices placed in them.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85440673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.03.55384.4085-22
М.К. Бубнов, С.А. Букарев, Сергей Викторович Гущин, Василий Андреевич Конюшкин, Сергей Валентинович Кузнецов, Александр Александрович Ляпин, A.H. Накладов, П. А. Рябочкина, В. В. Воронов, П. П. Федоров
Up-conversion luminescence spectra of CaF2-SrF2-HoF3 single crystals were investigated upon excitation by laser radiation with a wavelength of 1940 nm to the 5I7 level of Ho3+ ions. The CaF2-SrF2-HoF3 single crystals were grown by the vertical directional crystallization method. For these excitation conditions, quantitative characteristics of the up-conversion luminescence of Ho3+ ions were determined: energy yield, chromaticity coordinates, and correlated color temperatures. The possibility of increasing the efficiency of solar cells due to the conversion of infrared radiation in CaF2-SrF2-HoF3 crystals was considered.
{"title":"Ап-конверсионная люминесценция твердых растворов CaF-=SUB=-2-=/SUB=--SrF-=SUB=-2-=/SUB=--HoF-=SUB=-3-=/SUB=- при возбуждении на уровень -=SUP=-5-=/SUP=-I-=SUB=-7-=/SUB=- ионов Ho-=SUP=-3+-=/SUP=-","authors":"М.К. Бубнов, С.А. Букарев, Сергей Викторович Гущин, Василий Андреевич Конюшкин, Сергей Валентинович Кузнецов, Александр Александрович Ляпин, A.H. Накладов, П. А. Рябочкина, В. В. Воронов, П. П. Федоров","doi":"10.21883/os.2023.03.55384.4085-22","DOIUrl":"https://doi.org/10.21883/os.2023.03.55384.4085-22","url":null,"abstract":"Up-conversion luminescence spectra of CaF2-SrF2-HoF3 single crystals were investigated upon excitation by laser radiation with a wavelength of 1940 nm to the 5I7 level of Ho3+ ions. The CaF2-SrF2-HoF3 single crystals were grown by the vertical directional crystallization method. For these excitation conditions, quantitative characteristics of the up-conversion luminescence of Ho3+ ions were determined: energy yield, chromaticity coordinates, and correlated color temperatures. The possibility of increasing the efficiency of solar cells due to the conversion of infrared radiation in CaF2-SrF2-HoF3 crystals was considered.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78512532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.06.55925.123-23
А. С. Кучерявенко, В.А. Желнов, Н.В. Черномырдин, В. Н. Курлов, К. И. Зайцев, Г.М. Катыба
The development of terahertz (THz) imaging methods is hampered by the low spatial resolution of traditional diffraction-limited imaging systems, mainly due to the large wavelength of used radiation (from a few of mm to tens of µm). To solve this problem, we have proposed a new method of THz endoscopy with subwavelength spatial resolution, which is designed to study hard-to-reach areas of living organisms in vivo. A hollow-core sapphire tube with polytetrafluoroethylene outer coating is used as a waveguide, in which the antiresonant principle of radiation transmission is implemented. The waveguide and the immersion lens are optimized to provide high optical characteristics in a given wavelength range to ensure the best focusing. Two immersion lenses made of sapphire and silicon were developed and fabricated, which were then mounted on plane-parallel windows fixed on the rear end of the waveguide. The study of the field intensity distribution on the shadow side of the “waveguide–lens” system revealed a focal spot diameter of ≃0.2λ in the case of a lens made of sapphire and ≃0.3λ in the case of a lens made of crystal silicon at a wavelength λ = 500 µm, which significantly exceeds the Abbe diffraction limit. This agrees with our numerical predictions and demonstrates the promise of using the proposed endoscope for measurements with subwavelength resolution.
{"title":"Сочетание полого сапфирового волновода и иммерсионной линзы для ТГц эндоскопии сверхвысокого разрешения","authors":"А. С. Кучерявенко, В.А. Желнов, Н.В. Черномырдин, В. Н. Курлов, К. И. Зайцев, Г.М. Катыба","doi":"10.21883/os.2023.06.55925.123-23","DOIUrl":"https://doi.org/10.21883/os.2023.06.55925.123-23","url":null,"abstract":"The development of terahertz (THz) imaging methods is hampered by the low spatial resolution of traditional diffraction-limited imaging systems, mainly due to the large wavelength of used radiation (from a few of mm to tens of µm). To solve this problem, we have proposed a new method of THz endoscopy with subwavelength spatial resolution, which is designed to study hard-to-reach areas of living organisms in vivo. A hollow-core sapphire tube with polytetrafluoroethylene outer coating is used as a waveguide, in which the antiresonant principle of radiation transmission is implemented. The waveguide and the immersion lens are optimized to provide high optical characteristics in a given wavelength range to ensure the best focusing. Two immersion lenses made of sapphire and silicon were developed and fabricated, which were then mounted on plane-parallel windows fixed on the rear end of the waveguide. The study of the field intensity distribution on the shadow side of the “waveguide–lens” system revealed a focal spot diameter of ≃0.2λ in the case of a lens made of sapphire and ≃0.3λ in the case of a lens made of crystal silicon at a wavelength λ = 500 µm, which significantly exceeds the Abbe diffraction limit. This agrees with our numerical predictions and demonstrates the promise of using the proposed endoscope for measurements with subwavelength resolution.","PeriodicalId":24059,"journal":{"name":"Оптика и спектроскопия","volume":"129 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78939999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.21883/os.2023.07.56141.4568-23
Алексей Иванович Сидоров, Александр Александрович Ефимов
Представлены результаты численного моделирования оптических свойств одномерного (1D) фотонного кристалла с дефектом на основе слоев полупроводник-диэлектрик в ближнем ИК диапазоне. При моделировании использовались слои кремния и диоксида кремния с оптической толщиной 3λ/4, λ/4 и 10λ/4. Изучено влияние угла падения излучения на спектральное положение полосы пропускания дефекта. Показано, что чувствительность к углу поворота лежит в пределах 6-20 nm/deg и 1.7-5.5 dB/deg в зависимости от геометрии датчика и метода измерений. Это делает данные фотонные кристаллы перспективными для использования в датчиках угла поворота в качестве чувствительного элемента. Ключевые слова: датчик угла поворота, угол падения, фотонный кристалл, фотонная запрещенная зона, передаточная матрица.
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