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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Darmaev E. C., Ikonnikov D. A., Myslivets S. A., Arkhipkin V. G., Vyunishev A. M.
Заглавие : Variable spatial dynamics of optical vortices produced by a double fork-shaped grating
Колич.характеристики :8 с
Место публикации : Ann. Phys. - 2024. - Ст.2400120. - Article in press. - ISSN 00033804 (ISSN), DOI 10.1002/andp.202400120. - ISSN 15213889 (eISSN)
Примечания : Cited References: 31
Аннотация: Light diffraction is studied numerically and experimentally on a double fork-shaped grating representing a periodic grating containing two spaced dislocations. The spatial dynamics of the phase singularities (optical vortices) has been investigated as a function of dislocation parameters. Produced optical vortices affect each other while propagating in a free space. For dislocations of the same topological charge, the propagation trajectories and their transverse displacement coordinates depend on the dislocation spacing, and the larger the dislocation spacing, the smaller the relative displacement of the optical vortices and the smaller their trajectory curvatures. For oppositely charged dislocations, three types of spatial behavior of optical vortices are found. The numerical results agree well with the experimental data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ikonnikov D. A., Myslivets S. A., Davletshin N. N., Baron F. A., Arkhipkin V. G., Vyunishev A. M.
Заглавие : Unveiling Talbot effect under Fresnel diffraction at a fork-shaped grating
Место публикации : Ann. Phys. (Berlin). - 2023. - Vol. 535, Is. 3. - Ст.2200480. - ISSN 00033804 (ISSN), DOI 10.1002/andp.202200480. - ISSN 15213889 (eISSN)
Примечания : Cited References: 31. - The work was supported by the Russian Science Foundation (Grant No. 19-12-00203)
Аннотация: The near-field effect of diffraction image self-reproduction or self-imaging of a periodic grating illuminated by quasi-monochromatic wave is well-known as the Talbot effect. Introducing a dislocation to a periodic structure provides a fork-shaped modulation of the phase/amplitude, which produces discrete diffraction pattern in a far-field consisting of optical vortices. In this paper, Fresnel diffraction at amplitude fork-shaped grating is theoretically and experimentally studied. The coexistence of spatial ordering and local violation of translational symmetry of the structure manifests itself in a strict diffraction pattern consisting of optical vortices in the far-field, which is shown to be accompanied by formation of a spatially ordered intensity distribution in the near-field, reminiscent the Talbot carpets for periodic structures. These results demonstrate the first evidence of Talbot effect occurred under light diffraction at fork-shaped gratings, being promising for deep understanding of near-field singular optics phenomena.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : Transmission and reflection spectra of a Raman induced grating in atomic media
Коллективы : International Conference “Basic Problems of Optics” (VIII; October 20–24, 2014; St. Petersburg)
Место публикации : Opt. Spectrosc.: MAIK Nauka-Interperiodica / Springer, 2015. - Vol. 119, Is. 5. - P.770-775. - ISSN 0030-400X, DOI 10.1134/S0030400X1511003X
Примечания : Cited References: 19. - This work was supported by the Russian Foundation for Basic Research, project no. 15-02-03959
Предметные рубрики: ELECTROMAGNETICALLY INDUCED TRANSPARENCY
OPTICS
Аннотация: The spectral properties of an electromagnetically induced grating that is based on the spatial modulation of the Raman gain in the field of a standing pump wave in a three-level homogeneous medium have been discussed. It has been shown that, by varying the intensity or the frequency of the pump field, one can control the transmission and reflection spectra, while the transmission and reflection coefficients of the probe (Raman) wave can simultaneously be greater than unity. The influence of the nonideality of the standing wave on the spectral characteristics of the grating has been studied. © 2015, Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : The Talbot effect under selective reflection from a Raman induced grating
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2022. - Vol. 15, Is. 6. - P.687-698. - ISSN 19971397 (ISSN), DOI 10.17516/1997-1397-2022-15-6-687-698; Журн. СФУ. Матем. и физика. - ISSN 23136022 (eISSN)
Примечания : Cited References: 33. - This work was partially (results for 1D gratings) supported by the Russian Science Foundation (RSF) through Grant 19-12-00203
Аннотация: In the present work, we study the Talbot effect under selective reflection of probe radiation at the interface between a dielectric and a layer of resonant atoms, in which a Raman grating is induced. Under such conditions, the interface can operate as a reflective diffraction grating. The cases of one- and two-dimensional gratings are considered. It is shown that the reflection coefficient, with the account of the selectively reflected wave, can be both greater or smaller than the usual Fresnel reflection coefficient. The Talbot effect can be observed for a selectively reflected wave in the near-field diffraction region. The spatial structure of the diffraction patterns essentially depends on the pump field intensity and the Raman detuning.В работе исследуется эффект Тальбота при селективном отражении пробного излучения на границе раздела диэлектрик — слой резонансных атомов, в котором индуцируется рамановская решетка. В таких условиях интерфейс может выступать как отражательная дифракционная решетка. Рассмотрены случаи одномерных и двумерных решеток. Показано, что коэффициент отражения с учетом селективно отраженной волны может быть как больше, так и меньше обычного коэффициента отражения Френеля. Эффект Тальбота можно наблюдать для селективно отраженной волны в ближней дифракционной области. Пространственная структура дифракционных картин существенно зависит от напряженности поля накачки и рамановской отстройки.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Myslivets S. A.
Заглавие : Talbot effect based on a Raman-induced grating
Место публикации : Phys. Rev. A. - 2019. - Vol. 100, Is. 6. - Ст.06383. - ISSN 2469-9926, DOI 10.1103/PhysRevA.100.063835. - ISSN 2469-9934 (eISSN)
Примечания : Cited References: 28. - This work was supported by the Russian Science Foundation (RSF) through Grant No. 19-12-00203.
Аннотация: We theoretically study the Talbot effect resulting from Raman-induced grating based on periodic spatial modulation of the Raman gain and dispersion in the field of a standing pump wave. Features of integer and fractional Talbot effects are demonstrated for one- and two-dimensional (1D and 2D) Raman-induced gratings. It is shown that the intensity of diffraction images can increase due to Raman amplification in the grating. Glass-shaped diffraction patterns are demonstrated for 2D gratings. It is also shown that in the vicinity of the Talbot planes there are planes in which the diffraction patterns are spatially compressed and the intensity becomes greater. The results expand the possibility of using the Talbot effect in various applications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Shadrina, Galina, Sadreev A. F., Pichugin K. N.
Заглавие : Super-bound states in the continuum through merging in grating
Колич.характеристики :11 с
Место публикации : Phys. Rev. B. - 2023. - Vol. 108, Is. 12. - Ст.125303. - ISSN 24699950 (ISSN), DOI 10.1103/PhysRevB.108.125303. - ISSN 24699969 (eISSN)
Примечания : Cited References: 70. - We thankful Yi Xu and Zhanyuan Zhang for numerous fruitful discussions. The work was supported by Russian Science Foundation Grant No. 22-12-00070
Аннотация: We consider bound states in the continuum (BICs) in grating composed of infinitely long silicon rods of rectangular cross-section. We reveal merging off-Γ Friedrich-Wintgen BIC with symmetry protected BIC. We present CMT and multipole decomposition theory, complementing each other, to analyze the merging phenomenon. The theories show a crossover of the behavior of Q factor from standard inverse square law k-2x,z towards extremely fast boosting law k-6x,z in momentum space. In turn that crossover gives rise to another crossover from Q ~ N2 to Q ~ N3 for symmetry protected quasi-BIC in finite grating of N rods owing to suppression of radiation leakage of quasi-BIC mode from surface of grating. As a result, the Q factor of quasi-BIC is determined by residual leakage from ends of grating. We show numerically that this leakage can also be suppressed considerably if grating is stretched from the ends.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zakomirnyi V. I., Rasskazov I. L., Gerasimov V. S., Ershov A. E., Polyutov S. P., Karpov S. V.
Заглавие : Refractory titanium nitride two-dimensional structures with extremely narrow surface lattice resonances at telecommunication wavelengths
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2017. - Vol. 111, Is. 12. - Ст.123107. - ISSN 00036951 (ISSN), DOI 10.1063/1.5000726
Примечания : Cited References: 54. - This work was supported by the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019. Numerical calculations were performed using the MVS-1000M system at the Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): bandwidth--nanoparticles--nanostructures--optical properties--plasmons--q factor measurement--refractory materials--titanium compounds--diffractive grating--electromagnetic response--localized surface plasmon--low cost fabrication--plasmonic nanoparticle--telecommunication bandwidth--telecommunication wavelengths--two-dimensional structures--titanium nitride
Аннотация: Regular arrays of plasmonic nanoparticles have brought significant attention over the last decade due to their ability to support localized surface plasmons (LSPs) and exhibit diffractive grating behavior simultaneously. For a specific set of parameters (i.e., period, particle shape, size, and material), it is possible to generate super-narrow surface lattice resonances (SLRs) that are caused by interference of the LSP and the grating Rayleigh anomaly. In this letter, we propose plasmonic structures based on regular 2D arrays of TiN nanodisks to generate high-Q SLRs in an important telecommunication range, which is quite difficult to achieve with conventional plasmonic materials. The position of the SLR peak can be tailored within the whole telecommunication bandwidth (from ≈ 1.26 μm to ≈ 1.62 μm) by varying the lattice period, while the Q-factor is controlled by changing nanodisk sizes. We show that the Q-factor of SLRs can reach a value of 2 × 103, which is the highest reported Q-factor for SLRs at telecommunication wavelengths so far. Tunability of optical properties, refractory behavior, and low-cost fabrication of TiN nanoparticles paves the way for manufacturing cheap nanostructures with extremely stable and adjustable electromagnetic response at telecommunication wavelengths for a large number of applications.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Gerasimov V. S., Romano S., Polyutov S. P.
Заглавие : Refractive index sensing with optical bound states in the continuum
Место публикации : Opt. Express. - 2020. - Vol. 28, Is. 26. - P.38907-38916. - ISSN 10944087 (ISSN), DOI 10.1364/OE.411749
Примечания : Cited References: 56. - The research was supported by the Ministry of Science and High Education of Russian Federation, project no. FSRZ-2020-008. DNM is grateful to Andrey A. Bogdanov for useful discussion
Аннотация: We consider refractive index sensing with optical bounds states in the continuum (BICs) in dielectric gratings. Applying a perturbative approach we derived the differential sensitivity and the figure of merit of a sensor operating in the spectral vicinity of a BIC. Optimisation design approach for engineering an effective sensor is proposed. An analytic formula for the maximal sensitivity with an optical BIC is derived. The results are supplied with straightforward numerical simulations.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N., Semina P. N., Skorobogatov S. A.
Заглавие : Propagating bound states in the continuum in dielectric gratings
Место публикации : J. Opt. Soc. Am. B. - 2018. - Vol. 35, Is. 6. - P.1218-1222. - ISSN 07403224 (ISSN), DOI 10.1364/JOSAB.35.001218
Примечания : Cited References: 51
Ключевые слова (''Своб.индексиров.''): bound state--dielectric grating--fourier--variation of parameters
Аннотация: We consider propagating bound states in the continuum in dielectric gratings. The gratings consist of a slab with ridges periodically arranged either on top or on both sides of the slab. Based on the Fourier modal approach, we recover the leaky zones above the line of light to identify the geometries of the gratings supporting Bloch bound states propagating in the direction perpendicular to the ridges. Most importantly, it is demonstrated that if a two-sided grating possesses either mirror or glide symmetry, the Bloch bound states are stable to variation of parameters as long as the above symmetries are preserved.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Precise size sorting of nanoparticles by bound states in the continuum in a dual finite grating
Колич.характеристики :4 с
Место публикации : Opt. Lett. - 2023. - Vol. 48, Is. 17. - P.4705-4708. - ISSN 01469592 (ISSN), DOI 10.1364/OL.496198. - ISSN 15394794 (eISSN)
Примечания : Cited References: 37. - We acknowledge discussions with K.N. PichuginThe work was supported by Russian Science Foundation; grant no. 22-12-00070
Аннотация: We consider two parallel dielectric gratings (dual grating) which support accidental bound states in the continuum (BICs) mostly localized between gratings. As distinctive to true periodical BICs in an infinite dual grating, the enveloping intensity of quasi-BICs in a finite dual grating behaves as a standing wave. That behavior is a key property to trap nanoparticles into selected cells of the dual grating sorted by sizes of nanoparticles dragged by liquid flowing between gratings. For excitation of quasi-BIC with high quality factor by an electromagnetic plane wave with normal incidence and power 1 mW/µm2 we show high efficiency of sorting of nanoparticles by sizes.
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