Статті та доповіді НДІ Фізики

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https://dspace.onu.edu.ua/handle/123456789/25660

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Перегляд Статті та доповіді НДІ Фізики за Автор "Bekshaiev, Oleksandr Yа."

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  • Ескіз
    Документ
    Editorial: Singular and Correlation Optics
    (2021) Angelsky, Oleg V.; Bekshaiev, Oleksandr Yа.; Hanson, Steen G.; Mokhun, Igor I.; Vasnetsov, Mikhail V.; Wang, Wei; Бекшаєв, Олександр Янович; Бекшаев, Александр Янович
    Singularities in wave fields form a relatively young concept of wave physics originating from the seminal article by Nye and Berry. Initially, this concept seemed rather abstract and curious, but the development of laser optics has demonstrated the ubiquity of optical singularities and their exceptional power in characterization, control, and applications of light fields. The era of singular optics started, and now, it is difficult to indicate another area of optics that is developing so rapidly and steadily.
  • Ескіз
    Документ
    Editorial: Singular and Correlation Optics
    (2021) Angelsky, Oleg V.; Bekshaiev, Oleksandr Yа.; Бекшаєв, Олександр Янович; Бекшаев, Александр Янович; Hanson, Steen G.; Mokhun, Igor I.; Vasnetsov, Mikhail V.; Wang, Wei
    Singularities in wave fields form a relatively young concept of wave physics originating from the seminal article by Nye and Berry [1]. Initially, this concept seemed rather abstract and curious, but the development of laser optics has demonstrated the ubiquity of optical singularities and their exceptional power in characterization, control, and applications of light fields. The era of singular optics started [2, 3], and now, it is difficult to indicate another area of optics that is developing so rapidly and steadily.
  • Ескіз
    Документ
    Microscopic analysis of the energy, momentum and spin distributions in a surface plasmon-polariton wave: erratum
    (2021) Bekshaiev, Oleksandr Yа.; Бекшаєв, Олександр Янович; Бекшаев, Александр Янович; Angelsky, O. V.; Zheng, J.; Hanson, S. G.; Zenkova, C. Yu.
    We correct inessential mistakes in equations of the recently published paper [Opt. Mater. Express 11, 2165 (2021) ]. The mistakes do not affect the numerical results and conclusions of the paper.
  • Ескіз
    Документ
    Microscopic analysis of the energy, momentum, and spin distributions in a surface plasmon-polariton wave
    (2021) Bekshaiev, Oleksandr Yа.; Бекшаєв, Олександр Янович; Бекшаев, Александр Янович; Angelsky, O. V.; Zheng, J.; Hanson, S. G.; Zenkova, C. Yu.
    We analyze the electromagnetic field near a plane interface between a conductive and a dielectric media, under conditions supporting surface plasmon-polariton (SPP) propagation. The conductive medium is described by the hydrodynamic electron-gas model that enables a consistent analysis of the field-induced variations of the electron density and velocity at the interface and its nearest vicinity. The distributions of electromagnetic dynamical characteristics: energy, energy flow, spin and momentum are calculated analytically and illustrated numerically, employing silver-vacuum interface as an example. A set of the “field” and material contributions to the energy, spin and momentum are explicitly identified and classified with respect to their physical origins and properties, and the orbital (canonical) and spin (Belinfante) momentum constituents are separately examined. In this context, a procedure for the spin-orbital momentum decomposition in the presence of free charges is proposed and substantiated. The microscopic results agree with the known phenomenological data but additionally show specific nanoscale structures in the near-interface behavior of the SPP energy and momentum, which can be deliberately created, controlled and used in nanotechnology applications.
  • Ескіз
    Документ
    Structured Light Control and Diagnostics Using Optical Crystals
    (2021) Angelsky, O. V.; Bekshaiev, Oleksandr Yа.; Dragan, G. S.; Maksimyak, P. P.; Zenkova, C. Yu.; Zheng, Jun; Бекшаєв, Олександр Янович; Бекшаев, Александр Янович
    We describe experimental results exposing the possibilities of optical crystals, especially anisotropic and birefringent, for creation, control, and diagnostics of structured light fields with singular and extraordinary properties. The efficiency of birefringent media is demonstrated for purposeful generation of optical beams with phase singularities (optical vortices) and desirable patterns of internal energy flows, in both the mono- and polychromatic light. On the other hand, anisotropic micro-objects can be used as probing bodies for investigation of the peculiar features of internal energy flows and corresponding momentum and angular momentum distributions in structured light fields. In particular, the specific mechanical action of light fields, formed under the total-reflection conditions, has been detected that confirms the existence of “extraordinary” dynamical characteristics of evanescent light waves predicted theoretically: the “transverse” momentum and “vertical” spin and their dependence on the incident beam polarization. The results can be useful for the optical trapping and micromanipulation techniques, including the biomedical and pharmaceutical applications.
  • Ескіз
    Документ
    Structured Light Control and Diagnostics Using Optical Crystals
    (2021) Angelsky, Oleg V.; Bekshaiev, Oleksandr Yа.; Drahan, Hryhorii S.; Maksimyak, P. P.; Zenkova, C. Yu.; Zheng, Jun; Бекшаєв, Олександр Янович; Бекшаев, Александр Янович; Драган, Григорій Сильвестрович; Драган, Григорий Сильвестрович
    We describe experimental results exposing the possibilities of optical crystals, especially anisotropic and birefringent, for creation, control, and diagnostics of structured light fields with singular and extraordinary properties. The efficiency of birefringent media is demonstrated for purposeful generation of optical beams with phase singularities (optical vortices) and desirable patterns of internal energy flows, in both the mono- and polychromatic light. On the other hand, anisotropic micro-objects can be used as probing bodies forinvestigationofthepeculiarfeaturesof internalenergy flowsandcorresponding momentumandangularmomentumdistributionsinstructuredlight fields.Inparticular,the specific mechanical action of light fields, formed under the total-reflection conditions, has been detected that confirms the existence of “extraordinary” dynamical characteristics of evanescent light waves predicted theoretically: the “transverse” momentum and “vertical” spinandtheirdependenceontheincidentbeampolarization.Theresultscanbeusefulfor the optical trapping and micromanipulation techniques, including the biomedical and pharmaceutical applications.
  • Ескіз
    Документ
    Structured Light: Ideas and Concepts
    (2020) Angelsky, Oleg V.; Bekshaiev, Oleksandr Yа.; Hanson, Steen G.; Zenkova, Claudia Yu.; Mokhun, Igor I.; Jun, Zheng
    The paper briefly presents some essential concepts and features of light fields with strong spatial inhomogeneity of amplitude, phase, polarization, and other parameters. It contains a characterization of optical vortices, speckle fields, polarization singularities. A special attention is paid to the field dynamical characteristics (energy, momentum, angular momentum, and their derivatives), which are considered not only as mechanical attributes of the field but also as its meaningful and application-oriented descriptive parameters. Peculiar features of the light dynamical characteristics in inhomogeneous and dispersive media are discussed. The dynamical properties of paraxial beams and evanescent waves (including surface plasmon–polaritons) are analyzed in more detail; in particular, a general treatment of the extraordinary spin and momentum, orthogonal to the main propagation direction, is outlined. Applications of structured light fields for optical manipulation, metrology, probing, and data processing are described.