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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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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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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

Доп.точки доступа:
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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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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Pichugin, K. N.
Exceptional points through variation of distances between four coaxial dielectric disks / K. Pichugin, A. Sadreev, E. Bulgakov // Photonics. - 2021. - Vol. 8, Is. 11. - Ст. 460, DOI 10.3390/photonics8110460. - Cited References: 49. - This research was funded by Russian Foundation for Basic Research projects No. 19-02-00055 . - ISSN 2304-6732
Кл.слова (ненормированные):
resonant eigenmodes -- multiple exceptional points -- encircling of exceptional points
Аннотация: By variation of a refractive index and aspect ratio of the isolated disk, we achieved exceptional points (EPs) at which the resonant frequencies and resonant modes coalesce. However, in practice, that kind of variation presents a technological problem. We considered the method to avoid the problem by substitution of two disk’s dimers. In each dimer, variation of the distance between disks was equivalent to a variation of the aspect ratio of the dimer. Moreover, the variation of the distance between dimers provides the second parameter that gives rise to a vast number of EPs. We recovered the initial resonant eigenmode by encircling multiple EPs two, three, and four times in the two-dimensional parametric space of distances.

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Держатели документа:
Federal Research Center KSC SB RAS, Kirensky Institute of Physics, Krasnoyarsk, 660036, Russian Federation
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou, 510632, China

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Пичугин, Константин Николаевич
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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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Pichugin, K. N.
Ultrahigh-Q system of a few coaxial disks / K. Pichugin, A. Sadreev, E. Bulgakov // Nanophotonics. - 2021. - Vol. 10, Is. 17. - P. 4341-4346, DOI 10.1515/nanoph-2021-0345. - Cited References: 36. - The paper was funded by Russian Foundation for Basic Research project Nos. 19-02-00055 and the Silver age project of Guangdong province, China, Grant. 2020A131303010 . - ISSN 2192-8614
Кл.слова (ненормированные):
avoided resonant crossing -- Mie modes -- resonant modes of disk
Аннотация: Resonant modes of high contrast dielectric disk have finite Q-factors in the subwavelength range due to radiation leakage into the surrounding space. That leakage can be reduced considerably (a few times) by exploiting of the mechanism of destructive interference of two modes for avoided crossing of resonances (ACR) (Rybin et al. M. V. Rybin, K. L. Koshelev, Z. F. Sadrieva, et al., "High-Q Supercavity Modes in Subwavelength Dielectric Resonators,"Phys. Rev. Lett., vol. 119, p. 243901, 2017.). In the present paper we report suppression of radiation leakage by a few orders in magnitude via the ACR in the structure of three and four different coaxial disks. For fine multi-scale tuning of disks we reveal the ultrahigh-Q resonances of order 105 for the case of three disks and of order 106 for the case of four coaxial disks of equal radii.

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Держатели документа:
Federal Research Center KSC Siberian Branch, L.V. Kirensky Institute of Physics, RAN, Krasnoyarsk, 660036, Russian Federation
Department of Electronic Engineering, College of Information Science and Technology, Jinan University, Guangzhou, 510632, China

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Пичугин, Константин Николаевич
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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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Bulgakov, E. N.
Resonant binding of dielectric particles to a metal surface without plasmonics / E. Bulgakov, K. Pichugin, A. Sadreev // Phys. Rev. A. - 2021. - Vol. 103, Is. 5. - Ст. L051501, DOI 10.1103/PhysRevA.103.L051501. - Cited References: 36. - The work was supported by Russian Foundation for Basic Research Project No. 19-02-00055 . - ISSN 2469-9926. - ISSN 2469-9934

РУБ Optics + Physics, Atomic, Molecular & Chemical
Рубрики:
RADIATION PRESSURE
   OPTICAL BINDING
   FORCES
   MANIPULATION
Аннотация: A high index dielectric spherical particle supports the high-Q resonant Mie modes that result in a regular series of sharp resonances in the radiation pressure. The presence of a perfectly conducting metal surface transforms the Mie modes into extremely high-Q magnetic bonding or electric antibonding modes for the close approach of a sphere to a surface. We show that an electromagnetic plane wave with normal incidence results in repulsive or attractive resonant optical forces relative to a metal for the excitation of electric bonding or magnetic antibonding resonant modes, respectively. A magnitude of resonant optical forces reaches the order of 1 nN of magnitude for micron-sized silicon particles and a power of light 1mW/μm2 that exceeds the gravitational force by four orders. However, what is the most remarkable is there are steady positions for a sphere between the pulling and pushing forces that give rise to the resonant binding of the sphere to a metal surface.

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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:
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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10.

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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