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Acoustic resonances in non-Hermitian open systems / L. Huang, S. Huang, Ch. Shen [et al.] // Nat. Rev. Phys. - 2024. - Vol. 6, Is. 1. - P. 11-27, DOI 10.1038/s42254-023-00659-z. - Cited References: 288. - L.H. and A.E.M. were supported by the Australian Research Council Discovery Project (DP200101353) and the UNSW Scientia Fellowship programme. S.H. and Y.L. were supported by the Shanghai Science and Technology Committee (grant nos. 21JC1405600). C.S. was supported by the US National Science Foundation under grant no. CMMI-2137749. S.Y., X.N., S.K. and A.A. were supported by the Air Force Office of Scientific Research and Simons Foundation. A.S.P and A.F.S acknowledge the state assignment of Kirensky Institute of Physics. Y.K.C. and D.A.P. were supported by the Australian Research Council Discovery Project (grant no. DP200101708) . - ISSN 2522-5820
Аннотация: Acoustic resonances in open systems, which are usually associated with resonant modes characterized by complex eigenfrequencies, play a fundamental role in manipulating acoustic wave radiation and propagation. Notably, they are accompanied by considerable field enhancement, boosting interactions between waves and matter, and leading to various exciting applications. In the past two decades, acoustic metamaterials have enabled a high degree of control over tailoring acoustic resonances over a range of frequencies. Here, we provide an overview of recent advances in the area of acoustic resonances in non-Hermitian open systems, including Helmholtz resonators, metamaterials and metasurfaces, and discuss their applications in various acoustic devices, including sound absorbers, acoustic sources, vortex beam generation and imaging. We also discuss bound states in the continuum and their applications in boosting acoustic wave–matter interactions, active phononics and non-Hermitian acoustic resonances, including phononic topological insulators and the acoustic skin effect.

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Держатели документа:
The Extreme Optoelectromechanics Laboratory (XXL), School of Physics and Electronic Sciences, East China Normal University, Shanghai, China
Institute of Acoustics, Tongji University, Shanghai, China
Department of Mechanical Engineering, Rowan University, Glassboro, NJ, USA
Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY, USA
L. V. Kirensky Institute of Physics, Krasnoyarsk, Russia
School of Engineering and Technology, University of New South Wales, Canberra, Australian Capital Territory, Australia
Physics Program, Graduate Center, City University of New York, New York, NY, USA

Доп.точки доступа:
Huang, Lujun; Huang, Sibo; Shen, Chen; Yves, Simon; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Ni, Xiang; Kim, Seunghwi; Chiang, Yan Kei; Powell, David A.; Zhu, Jie; Cheng, Ya; Li, Yong; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Alu, Andrea; Miroshnichenko, Andrey E.
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Bound states in the continuum protected by reduced symmetry of three-dimensional open acoustic resonators / B. Jia, L. Huang, A. S. Pilipchuk [et al.] // Phys. Rev. Appl. - 2023. - Vol. 19, Is. 5. - Ст. 054001, DOI 10.1103/PhysRevApplied.19.054001. - Cited References: 30. - L. Huang and A.E. Miroshnichenko were supported by the Australian Research Council Discovery Project (DP200101353) and the UNSW Scientia Fellowship program. B. Jia, S. Huang, and Y. Li are supported by the National Natural Science Foundation of China (Grant No. 12074286), and Shanghai Science and Technology Committee under Grant No. 21JC1405600 . - ISSN 2331-7019
Аннотация: Bound states in the continuum (BICs) have been demonstrated as a powerful tool for trapping acoustic fields in an acoustic resonator. It has been widely recognized that symmetry-protected (SP) BICs result from symmetry incompatibility of some eigenmodes of a resonator with propagating modes of waveguides. The most typical example of SP BIC is the odd eigenmode of the resonator with the eigenfrequency embedded into the propagating band of even propagating eigenmodes of the waveguide. In this work, we consider a more sophisticated case of an acoustic cuboid resonator that is opened by the attachment of two cylindrical waveguides. We show that BICs can be sustained in an open acoustic resonator with reduced symmetry. For symmetrical positions of waveguides, the eigenmodes of the cuboid can also be classified as SP BICs and show different stability against the shifts of waveguides from the positions of symmetry of the cuboid. We fabricate a series of coupled waveguide resonators and experimentally verify the existence of these BICs by identifying the vanished linewidth of Fano resonance in transmission spectra. Besides, we also show that evanescent modes of waveguides play a role in the formation of BICs in a nonaxisymmetric waveguide-resonator system by tuning the angle θ between two waveguides. Consequently, the eigenmodes remain SP BICs for θ = 0° and θ = 180° but convert into accidental BICs at θ ≈ 85° or θ ≈ 275°. Such accidental BICs are also experimentally verified. Our results enrich the understanding of SP BICs and accidental BICs, and provide alternative methods of routing acoustic waves and designing acoustic devices requiring fine spectrum features, such as filters and sensors.

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Держатели документа:
Institute of Acoustics, Tongji University, Shanghai, 200092, People's Republic of China
School of Physics and Electronic Sciences, East China Normal University, Shanghai, 200241, People's Republic of China
School of Engineering and Information Technology, University of New South Wales, Canberra, Northcott Drive, Australian Capital Territory, 2600, Australia
L. V. Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAN, Krasnoyarsk 660036, Russia
Department of Mechanical Engineering, Rowan University, Glassboro, New Jersey, 08028, USA

Доп.точки доступа:
Jia, Bin; Huang, Lujun; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Huang, Sibo; Shen, Chen; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Li, Yong; Miroshnichenko, Andrey E.
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Bulgakov, E. N.
Bound states in the continuum in dielectric resonators embedded into metallic waveguide / E. N. Bulgakov, A. S. Pilipchuk, A. F. Sadreev // All-dielectric nanophotonics / ed.: A. S. Shalin [et al.] : Elsevier, 2023. - Chapt. 7. - P. 185-212. - (Nanophotonics series). - Cited References: 97. - РНФ № 22-12-00070

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

Доп.точки доступа:
Shalin, A. S. \ed.\; Valero, Adrià Canós \ed.\; Miroshnichenko, A. \ed.\; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Пилипчук, Артем Сергеевич.
Настольная лаборатория связанных состояний в континууме металлического волновода с диэлектрическими вставками / А. С. Пилипчук, Е. Н. Булгаков, А. Ф. Садреев // Енисейская фотоника-2022 : тезисы докладов : в 2-х т. / Сиб. федер. ун-т [и др.]. - Красноярск, 2022. - Т. 2, Секция 3 : Фотонные кристаллы, метаматериалы и топологические фазы. - С. 23-24. - Библиогр.: 6 . - ISBN 978-5-6045250-1-2

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

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Архипкин, Василий Григорьевич \чл. прогр. ком.\; Arkhipkin, V. G.; Втюрин, Александр Николаевич \чл. прогр. ком., зам. предс. орг. ком.\; Vtyurin, A. N.; Вьюнышев, Андрей Михайлович \чл. прогр. ком., чл. орг. ком.\; Vyunishev, A. M.; Зырянов, Виктор Яковлевич \чл. прогр. ком.\; Zyryanov, V. Ya.; Карпов, Сергей Васильевич \чл. прогр. ком.\; Karpov, S. V.; Садреев, Алмаз Фаттахович \чл. прогр. ком.\; Sadreev, A. F.; Тимофеев, Иван Владимирович \чл. орг. ком., чл. прогр. ком.\; Timofeev, I. V.; Панкин, Павел Сергеевич \чл. орг. ком.\; Pankin, P. S.; Пятнов, Максим Владимирович \чл. орг. ком.\; Pyatnov, M. V.; Булгаков, Евгений Николаевич; Bulgakov, E. N.; Садреев, Алмаз Фаттахович; Pilipchuk, A. C.; Сибирский федеральный университет; Российская академия наук; Сибирское отделение РАН; Федеральный исследовательский центр "Красноярский научный центр Сибирского отделения Российской академии наук"; Институт физики им. Л.В. Киренского Сибирского отделения РАН; Всероссийская научная конференция с международным участием "Енисейская фотоника-2022"(2 ; 2022 ; 19-24 сент. ; Красноярск); "Енисейская фотоника", Всероссийская научная конференция с международным участием(2 ; 2022 ; 19-24 сент. ; Красноярск)
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Degenerate bound states in the continuum in square and triangular open acoustic resonators / A. Sadreev, E. Bulgakov, A. Pilipchuk [et al.] // Phys. Rev. B. - 2022. - Vol. 106, Is. 8. - Ст. 085404, DOI 10.1103/PhysRevB.106.085404. - Cited References: 43 . - ISSN 2469-9950
Кл.слова (ненормированные):
Q factor measurement -- Bound-states -- Eigenstates -- Flow byes -- High Q factor -- Output flow -- Property -- Small perturbations -- Square resonators -- Triangular resonators -- Acoustic resonators
Аннотация: We consider square and equilateral triangular open acoustic resonators with the C4v and C3v symmetries, respectively. There is a unique property of square and triangular resonators of accidental number fourfold degeneracy of eigenstates that gives rise to twofold-degenerate Friedrich-Wintgen (FW) bound states in the continuum (BICs). Compared to usual FW BICs, the degenerate FW BICs maintain high Q factor in wide range of the size of resonators. That removes the fabrication difficulties of the proper choice of resonator. The presence of degenerate BICs in triangular resonators is extremely sensitive to switch output flows by small perturbations with 100% efficiency.

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Держатели документа:
Kirensky Institute of Physics Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
School of Engineering and Information Technology, University of New South Wales Canberra, Northcott Drive, AC2600, Australia

Доп.точки доступа:
Sadreev, A. F.; Садреев, Алмаз Фаттахович; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Miroshnichenko, A.; Huang, L.
}
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General framework of bound states in the continuum in an open acoustic resonator / L. Huang, B. Jia, A. S. Pilipchuk [et al.] // Phys. Rev. Appl. - 2022. - Vol. 18, Is. 5. - Ст. 054021, DOI 10.1103/PhysRevApplied.18.054021. - Cited References: 47. - L.H. and A.E.M. are supported by the Australian Research Council Discovery Project (Grant No. DP200101353) and the UNSW Scientia Fellowship program. Y.K.C. and D.A.P. are supported by the Australian Research Council Discovery Project (Grant No. DP200101708). B.J., S.H., and Y.L. are supported by the National Natural Science Foundation of China (Grant No. 12074286) and the Shanghai Science and Technology Committee (Grant No. 21JC1405600). A.P., E.B., and A.S. are supported by the Russian Science Foundation (Grant No. 22-12-00070) . - ISSN 2331-7019
Кл.слова (ненормированные):
Acoustic resonators -- Acoustic waveguides -- Bound-states -- Coupled waveguide resonators -- Degenerate modes -- Eigen modes -- General method -- High-Q resonances -- Momentum spaces -- Non-Hermitian Hamiltonians -- Waveguide-resonators -- Waveguide filters
Аннотация: Bound states in the continuum (BICs) provide a viable way of achieving high-Q resonances in both photonics and acoustics. In this work, we propose a general method of constructing Friedrich-Wintgen (FW) BICs and accidental BICs in a coupled acoustic waveguide-resonator system. We demonstrate that FW BICs can be achieved with arbitrary two degenerate resonances in a closed resonator, regardless of whether they have the same or opposite parity. Moreover, their eigenmode profiles can be arbitrarily engineered by adjusting the position of the attached waveguide. This suggests an effective way of continuously switching the nature of the BICs from FW BICs to symmetry-protected BICs or accidental BICs. Also, such BICs are sustained in the coupled waveguide-resonator system with shapes such as rectangles, ellipses, and rhomboids. These interesting phenomena are well explained by the two-level effective non-Hermitian Hamiltonian, where two strongly coupled degenerate modes play a major role in forming such FW BICs. Additionally, we find that such an open system also supports accidental BICs in geometry space instead of momentum space via tuning the position of the attached waveguide, which is attributed to the quenched coupling between the waveguide and eigenmodes of the closed cavity. Finally, we fabricate a series of three-dimensional coupled resonator waveguides and experimentally verify the existence of FW BICs and accidental BICs by measuring the transmission spectra. Our results complement the current BIC library in acoustics and provide nice routes for designing acoustic devices, such as acoustic absorbers, filters, and sensors.

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Держатели документа:
School of Engineering and Information Technology, University of New South Wales, Northcott Drive, Canberra, ACT 2600, Australia
Institute of Acoustics, Tongji University, Shanghai, 200092, China
L. V. Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAN, Krasnoyarsk, 660036, Russian Federation
Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708, United States
Department of Mechanical Engineering, Rowan University, Glassboro, NJ 08028, United States

Доп.точки доступа:
Huang, L.; Jia, B.; Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Chiang, Y.; Huang, S.; Li, J.; Shen, C.; Bulgakov, E. N.; Булгаков, Евгений Николаевич; Deng, F.; Powell, D. A.; Cummer, S. A.; Li, Y.; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Miroshnichenko, A. E.
}
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Bulgakov, E. N.
Desktop laboratory of bound states in the continuum in metallic waveguide with dielectric cavities / E. Bulgakov, A. Pilipchuk, A. Sadreev // Phys. Rev. B. - 2022. - Vol. 106, Is. 7. - Ст. 075304, DOI 10.1103/PhysRevB.106.075304. - Cited References: 64. - We are grateful to Lujun Huang, Andrey Miroshnichenko and Yi Xu for presentation of unpublished paper and discussions. The research was supported by Russian Science Foundation No. 22-12-00070 . - ISSN 2469-9950
Кл.слова (ненормированные):
Q factor measurement -- Topology -- Asymptotics -- Bound-states -- Dielectric cavities -- Infinite arrays -- Metallic waveguide -- Metallics -- Position and orientations -- Power -- Q-factors -- Maxwell equations
Аннотация: We consider dielectric cavities whose radiation space is restricted by two parallel metallic planes. The TM solutions of the Maxwell equations of the system are equivalent to the solutions of periodical arrays of dielectric cavities. The system readily allows to achieve bound states in the continuum (BICs) of any type including topological BICs as dependent on position and orientation of the cavities relative to the planes and that extremely facilitates experimental studies in comparison to infinite arrays of the cavities. We show the effect of merging of topologically protected BICs that pushes the square asymptotic of the Q factor into the power degree 4 or even 6.

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

Доп.точки доступа:
Pilipchuk, A. S.; Пилипчук, Артем Сергеевич; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Булгаков, Евгений Николаевич
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Pilipchuk, A. S.
Bound states in the continuum in open spherical resonator / A. S. Pilipchuk, A. A. Pilipchuk, A. F. Sadreev // Phys. Scr. - 2020. - Vol. 95, Is. 8. - Ст. 085002, DOI 10.1088/1402-4896/ab99fb. - Cited References: 33 . - ISSN 0031-8949
Кл.слова (ненормированные):
Bound states in the continuum -- effective non-Hermitian Hamiltonian -- acoustic resonator -- trapped modes
Аннотация: We consider the bound states in the continuum (BICs) or embedded trapped modes in an open spherical acoustic resonator. The eigenfrequencies of closed resonator are 2l+1-fold degenerated, where l is the orbital index. An attachment of two cylindrical waveguides lifts this degeneracy and transforms the eigenfrequencies into resonances whose real parts depend on the position of the waveguides. When the waveguides are angled by θ ≠ π, variation over that angle gives rise to avoided crossings of resonant modes with different l to result in the Friedrich-Wintgen BICs. For θ = π there might be only the symmetry protected BICs. When three waveguides are connected to the spherical resonator the Friedrich-Wintgen BICs occur due to the avoided crossings of resonant modes with the same l but different azimuthal indices -l ≤ m ≤ l.

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

Доп.точки доступа:
Pilipchuk, A. A.; Пилипчук, Алина Андреевна; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Пилипчук, Артем Сергеевич
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Пилипчук, Артем Сергеевич.
Возбуждение акустических полей с орбитальным угловым моментом в цилиндрических резонаторах с некоаксиально подсоединенными волноводами / А. С. Пилипчук, А. А. Пилипчук // Сборник трудов XVII Всероссийской школы-семинара «Физика и применение микроволн» имени профессора А.П. Сухорукова (Волны-2019). - 2019. - Секция: Акустика и акустооптика. - С. 84-85. - Библиогр.: 6. - Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта №18-32-00234 . - ISBN 978-5-600-02483-0

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

Доп.точки доступа:
Пилипчук, Алина Андреевна; Pilipchuk, A. C.; Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований"Физика и применение микроволн", Всероссийская школа-семинар имени А.П. Сухорукова(17 ; 2019 ; май ; 26-31 ; Можайск, Моск. обл.); Волны-2019. Всероссийская школа-семинар "Физика и применение микроволн" имени А.П. Сухорукова(17 ; 2019; май ; 26-31 ; Можайск, Московская обл.)
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10.

    Pilipchuk, A. S.
    Generation of vortex waves in non-coaxial cylindrical waveguides / A. S. Pilipchuk, A. A. Pilipchuk, A. F. Sadreev // J. Acoust. Soc. Am. - 2019. - Vol. 146, Is. 6. - Ст. 4333, DOI 10.1121/1.5139222. - Cited References: 26. - We acknowledge discussions with Dmitrii Maksimov. This work was supported by RFBR Grant No. 18-32-00234. . - ISSN 0001-4966. - ISSN 1520-8524
   Перевод заглавия: Генерация вихревых волн в некоаксиальных цилиндрических волноводах
Рубрики:
Operator theory
   Coordinate system
   Waveguides
   Wave mechanics
   Acoustic field
   Optical field
   Optical tweezers
   Acoustical properties
   Acoustic waves
   Electrical properties and parameters
Аннотация: A non-coaxial waveguide composed of a cylindrical resonator of radius R and cylindrical waveguides with the radii r1 and r2, respectively, is considered. The radii satisfy the inequality r1˂r2˂R. The conversion from the channel with zero orbital angular momentum (OAM) into the channels with non-zero OAM is achieved by shifting the center lines of the waveguides relative to the center line of the cylindrical resonator. The center lines of input and output waveguides are shifted relative to each other by the angle Δϕ in order to twist the output acoustic wave. The conversion efficiency of the input wave with zero OAM into the output wave with non-zero OAM as dependent on the frequency, length of the resonator, and Δϕ is considered, and the domains where the efficiency can reach almost 100% are found.

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

Доп.точки доступа:
Pilipchuk, A. A.; Пилипчук, Алина Андреевна; Sadreev, A. F.; Садреев, Алмаз Фаттахович; Пилипчук, Артем Сергеевич
}
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