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   В37

    Пичугин, Константин Николаевич.
    Эффекты квантовой интерференции в электронном транспорте через двумерные наноструктуры : автореф. дисна соиск. уч. степени канд. физ.-мат. наук. 01.04.07 - физ. конд. сост. / К. Н. Пичугин ; науч. рук. А. Ф. Садреев ; офиц. опп.: В. В. Вальков, В. В. Белошапкин ; Рос. акад. наук, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского, вед. орг. Ин-т физики полупроводников. - Красноярск, 2007. - 18 с. - Библиогр. -

ГРНТИ

29.19.16

29.31.21

Рубрики:
Наноструктуры--Свойства электромагнитные--Интерференция квантовая--Исследование

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Садреев, Алмаз Фаттахович \науч. рук.\; Sadreev, A. F.; Вальков, Валерий Владимирович \офиц. опп.\; Val'kov, V. V.; Белошапкин, Валерий Васильевич \офиц. опп.\; Pichugin, K. N.; Российская академия наук; Сибирское отделение РАН; Институт физики им. Л.В. Киренского Сибирского отделения РАН; Институт физики полупроводников Сибирского отделения РАН
Свободных экз. нет}
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   В31
   П 36

    Пичугин, Константин Николаевич.
    Эффекты квантовой интерференции в электронном транспорте через двумерные наноструктуры [Рукопись] : дис. на соиск. уч. степени канд. физ.-мат. наук : 01.04.07 / К. Н. Пичугин ; науч. рук. А. Ф. Садреев ; Рос. акад. наук, Сиб. отд-ние, Ин-т физики им. Л.В. Киренского. - Красноярск, 2007. - 112 с. - Библиогр. -

ГРНТИ

29.19

29.05.33

ББК В31я031

Держатели документа:
Библиотека Института физики им. Л. В. Киренского СО РАН
Доп.точки доступа:
Садреев, Алмаз Фаттахович \науч. рук.\; Sadreev, A.F.; Pichugin, K.N.; Российская академия наук; Сибирское отделение РАН; Институт физики им. Л.В. Киренского Сибирского отделения РАН
Экземпляры всего: 1
ДС (1)
Свободны: ДС (1)}
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Bulgakov, E. N.
Evolution of the resonances of two parallel dielectric cylinders with distance between them / E. N. Bulgakov, K. N. Pichugin, A. F. Sadreev // Phys. Rev. A. - 2019. - Vol. 100, Is. 4. - Ст. 043806, DOI 10.1103/PhysRevA.100.043806. - Cited References: 37. - We acknowledge discussions with D. N. Maksimov. This work was partially supported by Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017) and The Russian Foundation for Basic research RFBR Grant No. 19-02-00055. . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
WHISPERING-GALLERY MODES
MULTIPLE-SCATTERING
FACTOR ENHANCEMENT
Аннотация: We study evolution of resonant modes by traversing over the distance between two parallel dielectric cylinders. The processes of mutual scattering of Mie resonant modes by cylinders result in an interaction between the cylinders which lifts a degeneracy of resonances of the isolated cylinders. There are two basic scenarios of evolution. For strong interaction of cylinders resonances bypass the Mie resonances with increase of the distance. That scenario is typical for low-lying resonances (monopole and dipole). For weak interaction of cylinders the resonances are bound around the Mie resonances of isolated cylinders that form the second scenario. Both scenarios demonstrate a significant enhancement of the Q factor compared to the case of an isolated cylinder.

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Держатели документа:
Russian Acad Sci, Siberian Branch, Fed Res Ctr KSC, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич; Ministry of Education and Science of Russian FederationMinistry of Education and Science, Russian Federation [3.1845.2017]; Russian Foundation for Basic research RFBRRussian Foundation for Basic Research (RFBR) [19-02-00055]
}
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Pichugin, K. N.
Interaction between coaxial dielectric disks enhances the Q factor / K. N. Pichugin, A. F. Sadreev // J. Appl. Phys. - 2019. - Vol. 126, Is. 9. - Ст. 093105, DOI 10.1063/1.5094188. - Cited References: 32. - We are grateful to A. A. Bogdanov, E. N. Bulgakov, and D. N. Maksimov for numerous and fruitful discussions. This work was supported by the Russian Federation for Basic Research (RFBR) (Grant No. 19-02-00055) and Ministry of Education and Science of Russian Federation (State Contract No. 3.1845.2017). . - ISSN 0021-8979. - ISSN 1089-7550

РУБ Physics, Applied
Рубрики:
WHISPERING-GALLERY MODES
QUALITY-FACTOR
Аннотация: We study the behavior of resonant modes under variation of the distance between two coaxial dielectric disks and show an avoided crossing of resonances because of the interaction between the disks. Owing to coaxial arrangement of disks, the resonant modes are specified by the azimuthal index m = 0,1,2, ... . In the present paper, we consider the case m = 0. At a long enough distance, the modes are symmetric and antisymmetric hybridizations of the resonant modes of the isolated disk. With decreasing the distance, the interaction becomes stronger, giving rise to avoided crossings of different resonances of the isolated disk. This in turn enhances the Q factor of the two disks by one order in magnitude compared to the Q factor of the isolated disk.

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Держатели документа:
RAS, Fed Res Ctr KSC, Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Пичугин, Константин Николаевич; Russian Federation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [19-02-00055]; Ministry of Education and Science of Russian FederationMinistry of Education and Science, Russian Federation [3.1845.2017]
}
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Bulgakov, E. N.
Giant resonant enhancement of optical binding of dielectric particles / E. N. Bulgakov, K. N. Pichugin, A. F. Sadreev // Phys. Rev. A. - 2020. - Vol. 102, Is. 4. - Ст. 043518, DOI 10.1103/PhysRevA.102.043518. - Cited References: 49. - This work was supported by Russian Foundation for Basic Research Project No. 19-02-00055. A.S. thanks D. Maksimov and E. Sherman for helpful discussions . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
FORCE
SPHERES
BEAM
Аннотация: Optical coupling of two identical dielectric particles gives rise to bonding and antibonding resonances. The latter is featured by significant narrowing of the resonant width and strong enhancement of the Q factor for the high-index micron-size particles in subwavelength range. We consider particles shaped as spheres and disks under coaxial illumination of dual incoherent counterpropagating Bessel beams. In the case of spheres we derive analytical expressions for the optical binding (OB) force which decays and displays two periods of oscillations. For close distances the OB force enormously increases in the resonant regime. The case of two coaxial disks is featured by extremal enhancement of the Q factor owing to the twofold variation over the distance between disks and the aspect ratio of each disk compared to the case of two spheres. In that case we demonstrate enhancement of the OB force up to several tens of nanonewtons. We show that the magnitude and sign of the OB force strongly depend on the longitudinal wave vector of the Bessel beams.

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Держатели документа:
RAS, Kirensky Inst Phys, Fed Res Ctr, KSC,SB, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич; Russian Foundation for Basic Research ProjectRussian Foundation for Basic Research (RFBR) [19-02-00055]
}
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Bulgakov, E. N.
Interaction between dielectric particles enhances the Q factor. / E. N. Bulgakov, K. N. Pichugin, A. F. Sadreev // Journal of Physics: Conference Series. - 2020. - Vol. 1461, Is. 1. - Ст. 012144, DOI 10.1088/1742-6596/1461/1/012144. - Cited References: 22. - This work was supported by Russian Science Foundation through Grant 19-02-00055. A. S. thanks A. Bogdanov for numerous and fruitful discussions
Кл.слова (ненормированные):
Anti-symmetric -- Avoided crossings -- Dielectric particles -- Identical particles -- Individual particles -- Quality factors -- Strong enhancement -- Two particles -- Q factor measurement
Аннотация: We consider resonant modes of two dielectric identical particles which can be classified as symmetric and anti symmetric combinations of the resonant modes of individual particles. We show that an approaching of two particles gives rise to an avoided crossing of resonant poles because of interaction between the disks. That in turn results in strong enhancement of the quality factor factor of two disks compared to isolated disks.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center, KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич; International Conference on Metamaterials and Nanophotonics(4 ; 2019 ; 15 - 19 July ; St. Petersburg, Russian Federation)
}
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Bulgakov, E. N.
Interaction between dielectric particles enhances the Q-factor / E. Bulgakov, K. Pichugin, A. Sadreev // Adv. Electromagn. - 2019. - Vol. 8, Is. 4. - P. 108-117, DOI 10.7716/aem.v8i4.1292. - Cited References: 36. - We acknowledge discussions with A.A. Bogdanov and D.N. Maksimov. This work was partially supported by RFBR grant 19-02-00055 and Ministry of Education and Science of Russian Federation (state contract N 3.1845.2017/4.6). . - ISSN 2119-0275

РУБ Engineering, Electrical & Electronic
Рубрики:
WHISPERING-GALLERY MODES
MULTIPLE-SCATTERING
STATES
Аннотация: We study behavior of resonant modes with a distance between two dielectric resonators shaped as cylinders and disks. We reveal two basic scenarios of evolution of resonances with the distance between the cylinders. For larger distances and respectively weaker interaction of particles the resonances are bound around the resonances of isolated resonators and evolve by spiral way. For shorter distances and respectively stronger interaction the resonances bypass the isolated resonances. Both scenarios demonstrate considerable enhancement of the Q factor compared to the case of isolated particle.

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Держатели документа:
RAN, Kirensky Inst Phys, Siberian Branch, Fed Res Ctr KSC, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич; RFBRRussian Foundation for Basic Research (RFBR) [19-02-00055]; Ministry of Education and Science of Russian FederationMinistry of Education and Science, Russian Federation [3.1845.2017/4.6]
}
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Pichugin, K. N.
Self-induced light trapping in nonlinear Fabry–Perot resonators / K. N. Pichugin, A. F. Sadreev // Phys. Lett. A. - 2016. - Vol. 380, Is. 42. - P. 3570-3574, DOI 10.1016/j.physleta.2016.08.032. - Cited References: 32. - We thank D.N. Maksimov for discussions. The work was supported by Russian Science Foundation through grant 14-12-00266. . - ISSN 0375-9601
Кл.слова (ненормированные):
Bound state in the continuum -- Fabry-Perot resonator -- Light storage -- Nonlinear optics
Аннотация: In the framework of the coupled mode theory we consider light trapping between two off-channel resonators which serve as self-adjusted Fano mirrors due to the Kerr effect. By inserting an auxiliary nonlinear resonator between the mirrors we achieve self-tuning of phase shift between the mirrors. That allows for the light trapping for arbitrary distance between the mirrors. © 2016 Elsevier B.V.

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Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Пичугин, Константин Николаевич
}
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Nazmitdinov, R. G.
Spin control in semiconductor quantum wires: Rashba and Dresselhaus interaction / R. G. Nazmitdinov, K. N. Pichugin, M. . Valin-Rodriguez // Phys. Rev. B. - 2009. - Vol. 79, Is. 19. - Ст. 193303, DOI 10.1103/PhysRevB.79.193303. - Cited References: 20. - This work was partly supported by Ministerio de Ciencia e Innovacion (Spain), Grant No. FIS2008-00781/FIS and RFBR under Grants No. 08-02-00118 and No. 09-02-98005 (Russia). . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
MAGNETIC-FIELDS
SPINTRONICS
Кл.слова (ненормированные):
semiconductor quantum wires -- spin polarised transport -- spin-orbit interactions
Аннотация: We show that spin precession in a semiconductor quantum wire, caused by the Rashba and the Dresselhaus interactions (both of arbitrary strengths), can be suppressed by dint of an in-plane magnetic field. Using a condition of the translational invariance in the longitudinal coordinate, we found another type of symmetry, which arises at a particular set of intensity and orientation of the magnetic field and explains this suppression. Based on our findings, we propose a transport experiment to measure the strengths of the Rashba and the Dresselhaus interactions.

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Держатели документа:
[Nazmitdinov, R. G.] Univ Illes Balears, Dept Fis, E-07122 Palma de Mallorca, Spain
[Pichugin, K. N.] LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Valin-Rodriguez, M.] Conselleria Educ Cultura, E-07004 Palma de Mallorca, Spain
[Nazmitdinov, R. G.] Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia
ИФ СО РАН
Departament de Fisica, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russian Federation
Kirensky Institute of Physics, Akademgorodok 50/38, 660036 Krasnoyarsk, Russian Federation
Conselleria d'Educacio i Cultura, E-07004 Palma de Mallorca, Spain

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Valin-Rodriguez, M.
}
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10.

Bound states in the continuum in open Aharonov-Bohm rings / E. N. Bulgakov [et al.] // JETP Letters. - 2006. - Vol. 84, Is. 8. - P. 430-435, DOI 10.1134/S0021364006200057. - Cited References: 33 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
WAVE-GUIDE
   QUANTUM
   TRANSMISSION
   SCATTERING
   BILLIARDS
   ELECTRON
Аннотация: Using the formalism of the effective Hamiltonian, we consider bound states in a continuum (BIC). They are nonhermitian effective Hamiltonian eigenstates that have real eigenvalues. It is shown that BICs are orthogonal to open channels of the leads, i.e., disconnected from the continuum. As a result, BICs can be superposed to a transport solution with an arbitrary coefficient and exist in a propagation band. The one-dimensional Aharonov-Bohm rings that are opened by attaching single-channel leads to them allow exact consideration of BICs. BICs occur at discrete values of the energy and magnetic flux; however, it's realization strongly depends on the way to the BIC point.

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Держатели документа:
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
ИФ СО РАН
Institute of Physics, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Max-Planck-Institut fur Physik Komplexer Systeme, D-01187 Dresden, Germany

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Rotter, I.
}
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11.

Pichugin, K. N.
Goos-Hanchen and Imbert-Fedorov shifts of higher-order Laguerre-Gaussian beams reflected from a dielectric slab / K. N. Pichugin, D. N. Maksimov, A. F. Sadreev // J. Opt. Soc. Am. A. - 2018. - Vol. 35, Is. 8. - P. 1324-1329, DOI 10.1364/JOSAA.35.001324. - Cited References: 42. - Russian Foundation for Basic Research (RFBR) (17-52-45072). . - ISSN 1084-7529. - ISSN 1520-8532

РУБ Optics
Рубрики:
ORBITAL ANGULAR-MOMENTUM
   LIGHT-BEAM
   TRANSVERSE SHIFT
   LASER MODES
Аннотация: We consider reflection of the Laguerre-Gaussian light beams by a dielectric slab. In view of the unified operator approach, the higher-order Laguerre-Gaussian beams represent a parametric family with the transverse beam profile given by an arbitrary generating parameter. Relying on the Fourier expansion in the focal plane of the beam, we compute the Goos-Hanchen and the Imbert-Fedorov shifts for light beams with non-zero order and azimuthal index. It is demonstrated that both shifts exhibit resonant behavior as functions of the angle of incidence due to the interference between the waves reflected from the upper and lower interfaces. The centroid shifts strongly depend on the order and azimuthal index of the beam. Most interestingly, it is found that the generating parameter of the higher-order beam families strongly affects the shifts. Thus, reshaping of the incident wavefront with fixed order and azimuthal index changes the linear Goos-Hanchen shift up to one half of the beam radius, both negative and positive.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Maksimov, D. N.; Максимов, Дмитрий Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Пичугин, Константин Николаевич; Russian Foundation for Basic Research (RFBR) [17-52-45072]
}
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12.

Reply to "Comment on 'Thomson rings in a disk' " / A. Puente [et al.] // Phys. Rev. E. - 2017. - Vol. 95, Is. 2. - Ст. 026602, DOI 10.1103/PhysRevE.95.026602. - Cited References:5. - M.C. and K.P. are grateful for the warm hospitality at JINR. This work was supported in part by Bogoliubov-Infeld program of BLTP and Russian Foundation for Basic Research. . - ISSN 2470-0045. - ISSN 2470-0053

РУБ Physics, Fluids & Plasmas + Physics, Mathematical

Аннотация: We demonstrate that our model [Phys. Rev. E 91, 032312 (2015)] serves as a useful tool to trace the evolution of equilibrium configurations of one-component charged particles confined in a disk. Our approach reduces significantly the computational effort inminimizing the energy of equilibrium configurations, and it demonstrates a remarkable agreement with the values provided by molecular-dynamics calculations. We show that the Comment misrepresents our paper and fails to provide plausible arguments against the formation hexagonal structure for n = 200 in molecular-dynamics calculations.

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Держатели документа:
Univ Illes Balears, Dept Fis, E-07122 Palma De Mallorca, Spain.
Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia.
PAN, Inst Nucl Phys, Dept Theory Struct Matter, PL-31342 Krakow, Poland.
Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Puente, A.; Nazmitdinov, R. G.; Cerkaski, M.; Pichugin, K. N.; Пичугин, Константин Николаевич
}
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13.

Random matrix analysis of the monopole strength distribution in 208Pb / A. P. Severyukhin [et al.] // Phys. At. Nucl. - 2016. - Vol. 79, Is. 6. - P. 835-841, DOI 10.1134/S1063778816060223. - Cited References: 36. - A.P.S. thanks for the hospitality the Division of Mathematical Physics, Lund University, where a part of this work has been done. This work was partly supported by Russian Foundation for Basic Research (project nos. 16-52-150003 and 16-02-00228). . - ISSN 1063-7788
Аннотация: We study statistical properties of the 0+ spectrum of 208Pb in the energy region Ex ≤ 20 MeV. We use the Skyrme interaction SLy4 as our model Hamiltonian to create a single-particle spectrum and to analyze excited states. The finite-rank separable approximation for the particle–hole interaction enables us to perform the calculations in large configuration spaces. We show that while the position of the monopole resonance centroid is determined by one-phonon excitations of 0+, the phonon–phonon coupling is crucial for the description of the strength distribution of the 0+ spectrum. In fact, this coupling has an impact on the spectral rigidity Δ3(L) which is shifted towards the random matrix limit of the Gaussian orthogonal ensembles.

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Держатели документа:
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna, Russian Federation
Dubna State University, Dubna, Russian Federation
Mathematical Physics, LTH, Lund University, Lund, Sweden
Departament de Fisica, Universitat de les Illes Balears, Palma, Spain
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Severyukhin, A. P.; Aberg, S.; Arsenyev, N. N.; Nazmitdinov, R. G.; Pichugin, K. N.; Пичугин, Константин Николаевич
}
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14.

Super quasibound state in the continuum / Zh. Zhang, E. Bulgakov, K. Pichugin [et al.] // Phys. Rev. Appl. - 2023. - Vol. 20, Is. 1. - Ст. L011003, DOI 10.1103/PhysRevApplied.20.L011003. - Cited References: 60. - Zhanyuan Zhang and Yi Xu would like to thank the suggestions from Dr Meng Kang and Professor Chengbo Mou. This work is supported by National Natural Science Foundation of China (62222505), Russian Science Foundation with Grant No. 22-12-00070 and the Guangdong Introducing Innovative, Entrepreneurial Teams of “The Pearl River Talent Recruitment Program” (2019ZT08X340). K. Pichugin,E. Bulgakov and A. Sadreev acknowledge the state assignment of Kirensky Institute of Physics . - ISSN 2331-7019
Аннотация: Avoided crossing of resonances and merging multiple bound states in the continuum (BICs) are parallel means for tailoring the physical properties of BICs. Herein, we introduce a concept of super quasi-BIC for photonic crystal (PhC) systems where its quality (Q) factor is boosted in both parametric and momentum spaces. A super quasi-BIC with substantial enhancement of Q factor can be achieved in a finite PhC by combining avoided crossing of two symmetry-protected (SP) quasi-BICs in parametric space and merging BICs in momentum space simultaneously. Of note, analytical theory shows that the proposed mechanism results in the transition of asymptotic behavior of the Q factor over the numbers of resonators from N2 to exclusive N3 for SP BICs, which is highly significant for realizing quasi-BICs in a compact PhC. Microwave experiments are performed to validate the theoretical results. Our results provide a paradigm shift for manipulating the physical properties quasi-BICs in finite PhC structures, which can also be generalized to the two-dimensional PhC slab case. It would facilitate various applications, including but not limited to low-threshold lasing and high figure-of-merit sensing, etc.

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Держатели документа:
Guangdong Provincial Key Laboratory of Information Photonics Technology, Institute of Advanced Photonic Technology, School of Information Engineering, Guangdong University of Technology, Guangzhou, China
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519000, China

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Zhang, Zhanyuan; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Xu, Yi; Qin, Yuwen
}
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15.

Пичугин, Константин Николаевич.
Осцилляции Ааронова-Бома в двумерных мезоскопических кольцах / К. Н. Пичугин, А. Ф. Садреев // Конференция молодых ученых : материалы конф. / Рос. акад. наук [и др.]. - Красноярск, 1997. - С. 77-78

Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Садреев, Алмаз Фаттахович; Sadreev, A. F.; Pichugin, K. N.; Российская академия наук; Сибирское отделение РАН; Красноярский научный центр Сибирского отделения РАНКонференция молодых ученых [КНЦ СО РАН](1997 ; март ; 18 ; Красноярск)
}
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16.

Bulgakov, E. N.
Exceptional points in a dielectric spheroid / E. Bulgakov, K. Pichugin, A. Sadreev // Phys. Rev. A. - 2021. - Vol. 104, Is. 5. - Ст. 053507, DOI 10.1103/PhysRevA.104.053507. - Cited References: 60. - The work was supported by the Russian Foundation for Basic Research Project No. 19-02-00055 . - ISSN 2469-9926
Кл.слова (ненормированные):
Natural frequencies -- Refractive index -- Aspect-ratio -- Azimuthal index -- Dielectric spheroids -- Exceptional points -- Frequency modes -- Higher index -- Parametric variation -- Resonant mode -- Rotational symmetries
Аннотация: Evolution of resonant frequencies and resonant modes as dependent on the aspect ratio is considered in a dielectric high index spheroid. Because of rotational symmetry of the spheroid the solutions are separated by the azimuthal index m. By the two-parametric variation of a refractive index and the aspect ratio we achieve exceptional points at which the resonant frequencies and resonant modes are coalesced in the sector m=0.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
}
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17.

Exceptional points in periodic array of silicon rods / G. Shadrina, E. Bulgakov, A. Sadreev, K. Pichugin // Appl. Phys. Lett. - 2023. - Vol. 123, Is. 21. - Ст. 211104, DOI 10.1063/5.0173550. - Cited References: 37 . - ISSN 0003-6951. - ISSN 1077-3118
Аннотация: We find numerically the complex eigenvalues in grating composed of infinitely long silicon rods of rectangular cross section and show existence of exceptional points (EPs) in parametric space of structural scales and wave vector along the rods. The EPs have sufficiently small imaginary parts due to their proximity to bound states in the continuum. This enables to trace the resonant frequencies in the transmission around the EP and, accordingly, to identify the EP by bifurcation of the transmission. We present generic coupled mode theory to elucidate this effect. We also show that structural fluctuations of grating preserve EP but obscures their observation because of inhomogeneous broadening of transmission peaks.

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Держатели документа:
Institute of Computational Modelling, SB RAS, Krasnoyarsk 660036, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Shadrina, Galina; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Pichugin, K. N.; Пичугин, Константин Николаевич
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18.

Super-bound states in the continuum through merging in grating / E. Bulgakov, G. Shadrina, A. Sadreev, K. Pichugin // Phys. Rev. B. - 2023. - Vol. 108, Is. 12. - Ст. 125303, DOI 10.1103/PhysRevB.108.125303. - 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 . - ISSN 2469-9950. - ISSN 2469-9969
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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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk Russia
Russia Institute of Computational Modelling SB RAS, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Bulgakov, E. N.; Булгаков, Евгений Николаевич; Shadrina, Galina; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Pichugin, K. N.; Пичугин, Константин Николаевич
}
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19.

Pichugin, K. N.
A series of avoided crossings of resonances in the system of several different dielectric resonators results in giant Q-factors / K. Pichugin, A. Sadreev, E. Bulgakov // Photonics. - 2023. - Vol. 10, Is. 9. - Ст. 973, DOI 10.3390/photonics10090973. - Cited References: 64. - This work is supported by the Russian Science Foundation under grant 22-12-00070 . - ISSN 2304-6732
Кл.слова (ненормированные):
resonant modes -- avoided crossing -- high Q-factor
Аннотация: On an example of a system of three/four/five/six different coupled coaxial silicon disks, we realize a series of avoided crossings of resonances (ACRs) with respect to the different morphologies for the different scales of each disk. Each next step of ACR accompanied by the optimization processes of all previous ACRs contributes almost one order of magnitude to the Q-factor. As a result, we achieve unprecedented values for the Q-factors: 6.6·104 for three, 4.8·106 for four, 8.5·107 for five and several billions for six free standing silicon disks. Comparisons to such prominent methods as whispering gallery modes or quasi bound states in the continuum to boost the Q-factor demonstrate the tremendous advantage of the present approach not only in terms of Q-factor values but also in terms of mode volumes. Multipole analysis of the final hybridized resonant mode explains such extremely large Q-factor values. The analysis shows a strong redistribution of radiation owing to the almost-exact destructive interference of the dominating complex multipole radiation amplitudes.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Пичугин, Константин Николаевич
}
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20.

Bulgakov, E. N.
Mie resonance engineering in two disks / E. Bulgakov, K. Pichugin, A. Sadreev // Photonics. - 2021. - Vol. 8, Is. 2. - Ст. 49. - P. 1-14, DOI 10.3390/photonics8020049. - Cited References: 34. - This work was supported by RFBR grant 19-02-00055 . - ISSN 2304-6732
Кл.слова (ненормированные):
resonant modes -- avoided crossing -- Mie modes
Аннотация: Recently the recipes to achieve the high-Q subwavelength resonances in an isolated dielectric disk have been reported based on avoided crossing (anticrossing) of the TE resonances under variation of the aspect ratio of the disk. In a silicon disk that recipe gives an enhancement of the Q factor by one order of magnitude. In the present paper we present the approach based on engineering of the spherical Mie resonances with high orbital index in two coaxial disks by two-fold avoided crossing of the resonant modes of the disks. At the first step we select the resonant modes of single disk which are degenerate because of the opposite symmetry. Approaching of the second disk removes this degeneracy because of interaction between the disks. As a result at certain distances we realize the hybridized anti-bonding resonant modes whose morphology becomes close to the spherical Mie resonant mode with high orbital index. Respectively the Q factor of the anti-bonding resonant mode can be enhanced by three orders of magnitude compared to the case of single disk.

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Держатели документа:
L.V. Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAN, Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Pichugin, K. N.; Пичугин, Константин Николаевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
}
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