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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Pichugin K. N., Sadreev A. F.
Заглавие : Channel dropping via bound states in the continuum in a system of two nonlinear cavities between two linear waveguides
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, No. 39. - Ст.395304. - P. - ISSN 0953-8984, DOI 10.1088/0953-8984/25/39/395304
Ключевые слова (''Своб.индексиров.''): channel dropping--efficient channels--incident waves--linear waveguides--nonlinear cavities--numerical solution--parallel waveguides--two-dimensional photonic crystals--condensed matter physics--physics--waveguides
Аннотация: We show that two nonlinear resonant cavities aligned between two parallel waveguides can support self-induced bound states in the continuum (BSCs). These BSCs are symmetrical relative to an inversion of the waveguides and to inversion of the transport axis. Due to this BSCs can drop an incident wave from one waveguide to another with very high efficiency. We show also that the frequency of the efficient channel dropping can be tuned by injecting power. All these results are in good agreement with numerical solutions of the Maxwell equations in a two-dimensional photonic crystal of GaAs rods holding two parallel waveguides and two defects made of a Kerr medium. В© 2013 IOP Publishing Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Multirelaxation generalized refractive mixing dielectric model of moist soils
Место публикации : IEEE Geosc. Remote Sens. Letters. - 2013. - Vol. 10, Is. 3. - Ст.6332477. - P.603-606. - ISSN 1545-598X, DOI 10.1109/LGRS.2012.2215574
Ключевые слова (''Своб.индексиров.''): bound soil water--dielectric model--dielectric relaxations--dielectric spectra--free soil water--moist soil--bound waters--complex dielectric constant--debye relaxation--dielectric models--dielectric spectra--dipole relaxation--frequency ranges--gigahertz frequencies--gigahertz range--moist soil--soil water--spectroscopic parameters--water molecule--dielectric relaxation--mixing--molecules--soil moisture--geologic models
Аннотация: In this letter, a multirelaxation generalized refractive mixing dielectric model (GRMDM) for moist soil is proposed and substantiated in the frequency range from 0.04 to 26.5 GHz. This model is based on the methodology of a single-relaxation GRMDM which accounts only for the dipole relaxation of water molecules in the gigahertz frequency range. The proposed multirelaxation GRMDM takes into account both the dipole (Debye) and ionic (Maxwell-Wagner) relaxations of soil water molecules. For this purpose, it uses a two-frequency Debye relaxation equation for the dielectric spectra of bound water. The spectroscopic parameters of the multirelaxation GRMDM were derived by fitting the spectra calculated by this model to the respective measured ones. The main advantage of this model is that it predicts the complex dielectric constant of moist soils throughout the megahertz and gigahertz frequency ranges with the same error as the single-relaxation GRMDM does only in the gigahertz range.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mironov V. L., Bobrov P. P., Fomin S. V.
Заглавие : Dielectric model of moist soils with varying clay content in the 0.04 to 26.5 GHz frequency range
Коллективы : International Siberian Conference on Control and Communications
Место публикации : Int. Sib. Conf. on Control and Communicat.: Proc. - 2013. - Ст.6693613. - ISSN 978-1-4799-1060-1, DOI 10.1109/SIBCON.2013.6693613. - ISSN 978-14799-1062-5
Примечания : This work was supported by the Program of the Siberian Branch of the Russian Academy of Sciences, 2013-2016. Project II.12.1.1. - Загл. с этикетки диска
Ключевые слова (''Своб.индексиров.''): moist soil--dielectric model--dielectric spectra--dielectric relaxations--bound soil water--free soil water
Аннотация: In this paper, a soil texture dependent multirelaxation generalized refractive mixing dielectric model (MR GRMDM) for moist soils was developed. The model provides for complex permittivity of moist soils in both the gigahertz and megahertz frequency ranges, namely, from 40 MHz to 26.5 GHz.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Robust bound state in the continuum in a nonlinear microcavity embedded in a photonic crystal waveguide
Коллективы : Russian Science Foundation [14-12-00266]
Место публикации : Opt. Lett.: Optical Society of America, 2014. - Vol. 39, Is. 17. - P.5212-5215. - ISSN 0146-9592, DOI 10.1364/OL.39.005212. - ISSN 1539-4794
Примечания : Cited References: 27. - The work was supported by the Russian Science Foundation, grant 14-12-00266. We acknowledge discussions with Chia Wei Hsu and D. N. Maksimov.
Предметные рубрики: TRAPPED MODES
RESONANCES
Аннотация: We present a two-dimensional photonic crystal design of four defect dielectric rods, which form a microcavity with eigenfrequencies residing in the propagating band of a directional waveguide. In this system, a nonrobust bound state in the continuum (BSC) occurs as a result of full destructive interference of the monopole and quadrupole modes, with the same parity at certain values of the material parameters of the defect rods. Due to the Kerr effect, a robust BSC arises in a self-adaptive way without necessity to tune the material parameters. The absence of the superposition principle in that nonlinear system gives rise to coupling of the BSC with injected light, resulting in a novel transmission resonance. (C) 2014 Optical Society of America
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev E. N.
Заглавие : Bloch bound states in the radiation continuum in a periodic array of dielectric rods
Коллективы : Russian Science Foundation [14-12-00266]
Место публикации : Phys. Rev. A: American Physical Society, 2014. - Vol. 90, Is. 5. - Ст.53801. - ISSN 1050-2947, DOI 10.1103/PhysRevA.90.053801. - ISSN 1094-1622
Примечания : Cited References: 35. - The work was supported by the Russian Science Foundation through Grant No. 14-12-00266. We acknowledge discussions with D. N. Maksimov.
Предметные рубрики: WAVE-GUIDE
SCATTERING
CYLINDERS
CHANNEL
Аннотация: We consider an infinite periodic array of dielectric rods in vacuum with the aim to demonstrate three types of Bloch bound states in the continuum (BSCs): symmetry protected with a zero Bloch vector, embedded in one diffraction channel with nonzero Bloch vector, and embedded in two and three diffraction channels. The first and second types of the BSC exist for a wide range of material parameters of the rods, while the third occurs only at a specific value of the radius of the rods. We show that the second type supports the power flux along the array. In order to find BSCs we put forward an approach based on the expansion over the Hankel functions. We show how the BSC reveals itself in the scattering function when the singular BSC point is approached along a specific path in the parametric space.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Pilipchuk A. S.
Заглавие : Bound states in the continuum in zigzag quantum wire enforced by a finger gate
Коллективы : Russian Foundation for Basic Research [14-12-00266]
Место публикации : JETP Letters. - 2015. - Vol. 100, Is. 9. - P.585-590. - ISSN 0021, DOI 10.1134/S0021364014210139. - ISSN 10906487(eISSN)
Примечания : Cited References:41. - This work was supported by the Russian Foundation for Basic Research(project no. 14-12-00266).
Предметные рубрики: WAVE-GUIDE
DOUBLE-BEND
SYSTEMS
TRANSMISSION
RESONANCES
ELECTRON
Аннотация: We consider electron transport in a zigzag quantum wire by the effect of finger gate potential. Using a non-Hermitian effective Hamiltonian, we calculate resonance positions and widths to show that the resonance widths are easily governed by the gate potential. In particular, the resonance width can be enforced to be equal to zero, which leads to an electron localization with the Fermi energy embedded in the propagation band of the wire, i.e., the bound state in the continuum (BSC). We show that, for positive values of the potential, a zigzag wire becomes a Fabry-Perot resonator to give rise to BSC too.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimov D. N., Bulgakov E. N., Kolovsky A. R.
Заглавие : Wannier-Stark states in double-periodic lattices. I. One-dimensional lattices
Коллективы : Russian Foundation for Basic Research [15-02-00463]
Место публикации : Phys. Rev. A: American Physical Society, 2015. - Vol. 91, Is. 5. - Ст.053631. - ISSN 1050, DOI 10.1103/PhysRevA.91.053631. - ISSN 10941622(eISSN)
Примечания : Cited References:24. - The authors acknowledge financial support from Russian Foundation for Basic Research through the Project No. 15-02-00463, Wannier-Stark states and Bloch oscillations of a quantum particle in a generic two-dimensional lattice.
Предметные рубрики: BLOCH-ZENER OSCILLATIONS
TIGHTLY BOUND ELECTRONS
BANDS
FIELD
Аннотация: We analyze the Wannier-Stark spectrum of a quantum particle in generic one-dimensional double-periodic lattices. In the limit of a weak static field, the spectrum is shown to be a superposition of two Wannier-Stark ladders originating from two Bloch subbands. As the strength of the field is increased, the spectrum rearranges itself into a single Wannier-Stark ladder. We derive analytical expressions that describe the rearrangement employing the analogy between the Wannier-Stark problem and a driven two-level system in the strong-coupling regime.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Maksimov D. N., Pilipchuk A. S.
Заглавие : Gate controlled resonant widths in double-bend waveguides: bound states in the continuum
Коллективы : Russian Science Foundation [14-12-00266]
Место публикации : J. Phys.: Condens. Matter: IOP Publishing, 2015. - Vol. 27, Is. 29. - Ст.295303. - ISSN 0953, DOI 10.1088/0953-8984/27/29/295303. - ISSN 1361648X(eISSN)
Примечания : Cited References:52. - This work is supported by the Russian Science Foundation through Grant No. 14-12-00266. AS is grateful K-F Berggren for discussions.
Предметные рубрики: CIRCULAR BENDS
NUCLEAR REACTIONS
FANO RESONANCES
UNIFIED THEORY
QUANTUM
TRANSMISSION
TRANSPORT
SYSTEMS
Ключевые слова (''Своб.индексиров.''): double-bent waveguide--effective non-hermittian hamiltonian--bound--states in the continuum
Аннотация: We consider quantum transmission through double-bend Pi- and Z-shaped waveguides controlled by the finger gate potential. Using the effective non-Hermitian Hamiltonian approach we explain the resonances in transmission. We show a difference in transmission in the short waveguides that is the result of different chirality in Z and Pi waveguides. We demonstrate that the potential selectively affects the resonant widths resulting in the occurrence of bound states in the continuum.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pichugin K. N., Sadreev A. F.
Заглавие : Frequency comb generation by symmetry-protected bound state in the continuum
Коллективы : Russian Foundation for Basic Research (RFBR) [03-02-00497]
Место публикации : J. Opt. Soc. Am. B: Optical Society of America, 2015. - Vol. 32, Is. 8. - P.1630-1636. - ISSN 0740, DOI 10.1364/JOSAB.32.001630. - ISSN 15208540(eISSN)
Примечания : Cited References:48. - Russian Foundation for Basic Research (RFBR) (03-02-00497).
Предметные рубрики: RADIATION CONTINUUM
DIMER
MICRORESONATOR
EVOLUTION
CAVITIES
BREAKING
EQUATION
Аннотация: We study the dynamical response of two nonlinear microresonators coupled with a photonic crystal waveguide. We find a domain in the space of frequency and amplitude of the probing light where all stationary solutions are unstable. In this domain, scattered light carries multiple harmonics with equidistantly spaced frequencies [frequency comb (FC) effect]. Two identical resonators coupled with the waveguide support the symmetry-protected bound state in the continuum whose response is singular, as the amplitude of the injected wave tends to zero. As a result, the FC interval tends to zero when the amplitude of probing light diminishes, which paves the way for all-optical generation of waves with ultralow frequency. (C) 2015 Optical Society of America
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Sadreev A. F.
Заглавие : Light trapping above the light cone in a one-dimensional array of dielectric spheres
Коллективы : Russian Science Foundation [14-12-00266]
Место публикации : Phys. Rev. A: American Physical Society, 2015. - Vol. 92, Is. 2. - Ст.023816. - ISSN 1050, DOI 10.1103/PhysRevA.92.023816. - ISSN 10941622(eISSN)
Примечания : Cited References:62. - The work was supported by the Russian Science Foundation through Grant No. 14-12-00266. We acknowledge discussions with D. N. Maksimov.
Предметные рубрики: CLASSICAL ELECTROMAGNETIC SCATTERING
ENERGY PHOTON DIFFRACTION
BLOCH SURFACE-WAVES
RADIATION CONTINUUM
MULTIPLE-SCATTERING
CONSUMMATE SOLUTION
LINEAR ARRAYS
BOUND-STATES
MODES
GUIDES
Аннотация: We demonstrate bound states in the first TE and TM diffraction continua (BSC) in a linear periodic array of dielectric spheres in air above the light cone. We classify the BSCs according to the symmetry specified by the azimuthal number m, the Bloch wave vector β directed along the array, and polarization. The most simple symmetry-protected TE and TM polarized BSCs have m=0 and β=0 and occur in a wide range of the radii of the spheres and dielectric constants. More complicated BSCs with m≠0 and β=0 exist only for a selected radius of the spheres at a fixed dielectric constant. We also find robust Bloch BSCs with β≠0 and m=0. We present also the BSCs embedded into two and three diffraction continua. We show that the BSCs can be easily detected by the collapse of the Fano resonance for scattering of electromagnetic plane waves by the array.
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