Персона: Тищенко, Алексей Александрович
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Институт нанотехнологий в электронике, спинтронике и фотонике
Институт ИНТЭЛ занимается научной деятельностью и подготовкой специалистов в области исследования физических принципов, проектирования и разработки технологий создания компонентной базы электроники гражданского и специального назначения, а также построения современных приборов на её основе.
Наша основная цель – это создание и развитие научно-образовательного центра мирового уровня в области наноструктурных материалов и устройств электроники, спинтроники, фотоники, а также создание эффективной инновационной среды в области СВЧ-электронной и радиационно-стойкой компонентной базы, источников ТГц излучения, ионно-кластерных технологий материалов.
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Тищенко
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Алексей Александрович
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23 results
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Теперь показываю 1 - 10 из 23
- ПубликацияТолько метаданныеNear-field resonances in photon emission via interaction of electrons with coupled nanoparticles(2019) Tishchenko, A. A.; Sergeeva, D. Y.; Тищенко, Алексей Александрович; Сергеева, Дарья ЮрьевнаIn this work we construct the first-principles theory for the near-field resonances arising in the system of two different coupled nanoparticles excited by the external field. The obtained expressions are valid for an arbitrary external field; the detailed analysis is performed for the case of a fast electron passing by. The energy of electron is arbitrary, so the results are valid both for relativistic and nonrelativistic electrons. We have obtained rigorous analytical solution for the radiation field and for distribution of radiation over angles and frequencies. The effect of interaction between the single particles manifests itself very distinctly in conditions of resonance, resulting in a spectral shift of the radiation maximum, significant increase of its altitude, and, interestingly, in clear oscillations in radiation intensity not only when the particles are very close to each other, but even when the distance between the particles exceeds considerably their sizes. It attests to the strong influence of interaction on the radiation processes in a system of coupling particles.
- ПубликацияТолько метаданныеTHz Smith Purcell and grating transition radiation from metasurface: experiment and theory(2021) Sergeeva, D. Y.; Aryshev, A. S.; Tishchenko, A. A.; Popov, K. E.; Сергеева, Дарья Юрьевна; Тищенко, Алексей АлександровичWe report the results of experimental and theoretical studies of monochromatic coherent terahertz radiation generated by a short relativistic electron bunch interacting with a metasurface. The metasurface consists of subwavelength metal elements arranged on a dielectric substrate. The constructed theory explains the experimental spectra of Smith-Purcell radiation and grating transition radiation with wry high precision. The orientational distribution of transition radiation shows a fine structure, which, as we suppose, may be due to contribution of coupling between the metasurface's elements. (C) 2021 Optical Society of America
- ПубликацияТолько метаданныеTheory of Smith-Purcell radiation from a 2D array of small noninteracting particles(2021) Garaev, D. I.; Sergeeva, D. Y.; Tishchenko, A. A.; Гараев, Дамир Ильдарович; Сергеева, Дарья Юрьевна; Тищенко, Алексей Александрович© 2021 American Physical Society.We construct the first-principles theory for the scattering of the Coulomb field of a fast electron traveling along an array of nano- or microparticles. The electron's trajectory is arbitrarily oriented in the plane parallel to the surface. We show that Smith-Purcell radiation accompanying this process results in very rich diffraction patterns, which differ dramatically from the ones for conventional diffraction gratings; a numerical analysis was made for THz frequencies. The generalized Smith-Purcell dispersion relation has been derived; it describes the link between frequency, two periods of the structure, the electron's velocity, and the angle of radiation with maximal intensity. The unique spatial distribution of the generated light can form the basis for the generation of structured-light electron-driven photon sources.
- ПубликацияТолько метаданныеIncoherent Form Factor in Diffraction and Smith—Purcell Radiations(2019) Tishchenko, A. A.; Sergeeva, D. Y.; Тищенко, Алексей Александрович; Сергеева, Дарья Юрьевна© 2019, Pleiades Publishing, Inc.It has been shown that polarization radiation of charged particle beams generally includes an incoherent form factor caused by a finite transverse size of a beam. Consequently, a widespread opinion that the form factor characterizes only coherent radiation of charge particle bunches is generally invalid. The reason for the existence of incoherent form factor is the interaction of charged particles with the target edge in the direction perpendicular to their trajectory. The incoherent form factor exists for diffraction radiation, Smith-Purcell radiation, and other types of polarization radiation in the case of transversely limited targets: transition radiation, parametric X-ray radiation, and Cherenkov radiation. It has been shown that the difference of the incoherent form factor from unity increases with a decrease in the ratio of the impact parameter to the transverse size of the bunch. Furthermore, it has been shown that the transverse part of the coherent form factor differs from unity to the same extent as the incoherent form factor.
- ПубликацияТолько метаданныеDoes a Form Factor in Smith–Purcell Radiation Exist Always?(2022) Sergeeva, D. Y.; Tishchenko, A. A.; Сергеева, Дарья Юрьевна; Тищенко, Алексей АлександровичIn the theory of radiation emitted by bunches of charged particles, the effects of coherence are commonly taken into account by multiplying the intensity of radiation generated by a single particle by the form factor of the bunch, which depends on its size, shape, and particle distribution. Here, it is demonstrated that this approach is, generally speaking, incorrect for polarization radiation from a wide class of structures like photonic crystals and metasurfaces. The theory of coherent Smith–Purcell radiation from such structures has been developed. It is shown that the commonly accepted approach is applicable only under two conditions: (i) the observation point lies in the plane containing the trajectory of the bunch and the normal to the surface of the target, and (ii) the radius of the bunch is much smaller than the effective range of the Coulomb field of the moving electrons. © 2022, Pleiades Publishing, Inc.
- ПубликацияТолько метаданныеPolarized grating transition radiation from a 2D photonic crystal(2022) Sergeeva, D. Y.; Garaev, D. I.; Tishchenko, A. A.; Сергеева, Дарья Юрьевна; Гараев, Дамир Ильдарович; Тищенко, Алексей Александрович
- ПубликацияТолько метаданныеOn the Polarizability of a Cluster of Interacting Particles in Polarization Radiation(2020) Sergeeva, D. Y.; Tishchenko, A. A.; Сергеева, Дарья Юрьевна; Тищенко, Алексей Александрович© 2020, Pleiades Publishing, Ltd.Abstract: The study considers diffraction radiation, which is excited when an electron moves near a cluster of two interacting subwavelength particles. The interaction is manifested in the fact that the radiation field from each particle is determined not only by the external field of the electron, but also by the field of the neighboring particle. Based on the obtained expressions for the radiation field, the function of cluster polarizability is determined. It characterizes the cluster response to the field of the electron as a whole. It is interesting that the obtained response function of the cluster to an external field, even in the framework of linear theory, generally depends on the external field itself.
- ПубликацияТолько метаданныеOn polarization of Smith-Purcell radiation from a photonic crystal slab(2024) Garaev, D. I.; Sergeeva, D. Y.; Tishchenko, A. A.; Гараев, Дамир Ильдарович; Сергеева, Дарья Юрьевна; Тищенко, Алексей Александрович
- ПубликацияТолько метаданныеEnhanced Smith-Purcell radiation based on quasibound states in the continuum in dimers aligned in a chain(2023) Sergeeva, D. Y.; Tishchenko, A. A.; Сергеева, Дарья Юрьевна; Тищенко, Алексей Александрович
- ПубликацияТолько метаданныеFocusing of Smith-Purcell radiation from a two-dimensional particle array in the prewave zone(2023) Garaev, D. I.; Sergeeva, D. Y.; Tishchenko, A. A.; Гараев, Дамир Ильдарович; Сергеева, Дарья Юрьевна; Тищенко, Алексей Александрович
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