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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Burkov S. I., Sorokin B. P., Glushkov D. A., Aleksandrov K. S.
Заглавие : Theory and computer simulation of the reflection and refraction of bulk acoustic waves in piezoelectrics under the action of an external electric field
Место публикации : Crystallogr. Rep. - 2005. - Vol. 50, Is. 6. - P.986-993. - ISSN 1063-7745, DOI 10.1134/1.2132408
Примечания : Cited References: 11
Аннотация: The basic equations describing the conditions for reflection and refraction of bulk acoustic wave at the interface between acentric crystals subjected to the action of a uniform external electric field are reported. Numerical analysis of the effect of this field on the reflection and refraction anisotropy of bulk acoustic waves at the crystal/vacuum and piezoelectrie/elastic-isotropic-medium interfaces is performed. (C) 2005 Pleiades Publishing, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Burkov S. I., Sorokin B. P., Aleksandrov K. S., Karpovich A. A.
Заглавие : Reflection and refraction of bulk acoustic waves in piezoelectrics under uniaxial stress
Место публикации : Acoust. Phys. - 2009. - Vol. 55, Is. 2. - P.178-185. - ISSN 1063-7710, DOI 10.1134/S1063771009020055
Примечания : Cited References: 10
Предметные рубрики: ELECTRIC-FIELD
Аннотация: Basic equations that describe the conditions of reflection and refraction of bulk acoustic waves at the boundary between acentric crystalline media under uniaxial stress are presented. The effect of uniaxial stress on the anisotropy of reflection and refraction of bulk acoustic waves is numerically analyzed for boundaries of the crystal-vacuum, piezoelectric crystal-piezoelectric crystal, and piezoelectric crystal-elastic isotropic medium types.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Burkov S. I., Sorokin B. P., Karpovich A. A., Aleksandrov K. S.
Заглавие : Reflection and refraction of bulk acoustic waves in piezoelectric crystals under the action of bias electric field and uniaxial pressure
Коллективы : IEEE International ultrasonics symposium
Место публикации : Proceedings - IEEE Ultrasonics Symposium. - 2008. - Ст.4803254. - P.2161-2164. - ISBN 1051-0117, DOI 10.1109/ULTSYM.2008.0535
Ключевые слова (''Своб.индексиров.''): bias electric field--bulk elastic wave--mechanical stress--piezoelectric crystal--reflection--refraction--bias electric field--bulk acoustic waves--bulk elastic wave--mechanical stress--piezoelectric crystal--piezoelectric crystals--uniaxial pressures--acoustic wave reflection--acoustics--crystals--elastic waves--elasticity--electric field measurement--electric fields--piezoelectric materials--piezoelectric transducers--piezoelectricity--refraction--soil structure interactions--stresses
Аннотация: Main theory results concerned with bulk elastic wave reflection/refraction on the boundary between two piezoelectric crystals subjected to the action of bias electric field or mechanical stress have presented. Some calculations for LiNbO3 and Bi12GeO20 crystals have made. В©2008 IEEE.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Arkhipkin V. G., Timofeev I. V.
Заглавие : Propagation of two short pulses under conditions of electromagnetically induced transparency: adiabatic following
Коллективы : International Workshop/Fall School Meeting for Young Scientists and Students on Optics, Laser Physics, and Biophysics (Saratov Fall Meeting 99) (1999 ; Oct.; Saratov)
Место публикации : Saratov fall meeting '99: Laser physics and spectroscopy. Ser. Proceedings of the society of photo-optical instrumentation engineers (SPIE): SPIE-Int. Soc. Optical Engineering, 2000. - Vol. 4002. - P.45-51. - ISBN 0277-786X, DOI 10.1117/12.380132. - ISBN 0-8194-3627-5
Примечания : Cited References: 31
Предметные рубрики: POPULATION TRANSFER
LASER-PULSES
QUANTUM
COHERENCE
MEDIA
INDEX
INTERFERENCE
ENHANCEMENT
TRANSITIONS
REFRACTION
Ключевые слова (''Своб.индексиров.''): electromagnetically-induced transparency--coherent population trapping--atomic coherence--quantum interference--adiabatic following--dressed field pulses
Аннотация: Spatio-temporal dynamics of two short laser pulses propagating in an absorbing medium, which consists of one-and two-photon resonant ii-atoms, is investigated in the adiabatic approximation. We give an analytical solution and compare it with numerical simulations. It is shown that pulses may propagate in a medium, whose thickness is considerably greater than the length of the linear absorption of a single weak probe wave. Finally, full transfer of the probe pulse energy into the coupling pulse takes place. A vector model of the adiabatic interaction of two pulses with three-level atom is proposed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Maksimova O. A., Kosyrev N. N., Varnakov S. N., Lyashchenko S. A., Ovchinnikov S. G.
Заглавие : Features of the ellipsometric investigation of magnetic nanostructures
Коллективы : Russian Federation [2886.2014.2], RFBR [13-02-01265, 14-02-01211], Ministry of Education and Science of the Russian Federation[14.604.21.0002, 02.G25.31.0043], Foundation for Assistance to SmallInnovative Enterprises in Science and Technology [0003831]
Место публикации : J. Struct. Chem.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 55, Is. 6. - P.1134-1141. - ISSN 0022, DOI 10.1134/S0022476614060225. - ISSN 15738779(eISSN)
Примечания : Cited References:8. - The work was supported by the Program of the President of the RussianFederation for the support of leading scientific schools (ScientificSchool 2886.2014.2), RFBR (grant No. 13-02-01265, No. 14-02-01211), theMinistry of Education and Science of the Russian Federation (Agreement14.604.21.0002 State contract No. 02.G25.31.0043), and the Foundationfor Assistance to Small Innovative Enterprises in Science and Technology(program "A Member of the Youth Research and Innovation Competition",contract number 0003831).
Предметные рубрики: PARAMETERS
Ключевые слова (''Своб.индексиров.''): magneto-ellipsometry--ellipsometric measurements--magneto-optical kerr--effect--thin films--semi-infinite medium model--refraction coefficient
Аннотация: The technique for interpreting magneto-ellipsometric measurements is proposed. The model of a homogeneous semi-infinite medium for reflecting layered magnetic structures in the presence of the magnetic field in the configuration of the magneto-optical equatorial Kerr effect is considered. Based on the analysis of the Fresnel coefficients with regard to the magneto-optical parameter Q appearing in the off-diagonal elements of the permittivity tensor, the expressions are obtained using which the refraction (n) and absorption (k) coefficients, the real (Q (1)) and imaginary (Q (2)) parts of the magneto-optical parameter can be found from the ellipsometric (psi(0) and Delta(0)) and magneto-ellipsometric (psi(0) + delta psi and Delta(0) + delta I") measurements. The results will allow to measure and analyze the magnetic characteristics such as hysteresis loops and the coercitive force of layered nanostructures using the conventional ellipsometric equipment.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Timofeev I. V., Vetrov S. Ya.
Заглавие : Spectral manifestation of an effective refraction index in a chiral optical medium inside a Fabry-Perot resonator with anisotropic mirrors
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2014. - Vol. 78, Is. 12. - P.1308-1312. - ISSN 1062-8738, DOI 10.3103/S1062873814120296
Примечания : Cited References: 11. - This work was supported by Russian Ministry of Education and Science under the Government program, Project No. 3.1276.2014/K; by the Presidium of the Russian Academy of Sciences, grant nos. 24.29, 24.31; by the Russian Academy of Sciences’ Department of Physical Sciences, grant no. III.9.5; by the Siberian Branch of the Russian Academy of Sciences, grant nos. 43, 101; by the Russian Foundation for
Ключевые слова (''Своб.индексиров.''): anisotropic media--anisotropy--phase shift--phase shifters--refraction--effective refraction index--eigen modes--fabry-perot resonators--optical axis--optical cavities--optical medium--refraction index--fabry-perot interferometers
Аннотация: New boundary conditions for the decoupling of elliptically polarized eigenmodes in an anisotropic optical cavity are proposed. It is shown that twisting the optical axis changes the phase shift of the waves. The difference between the effective refraction indices is greater than the one between ordinary and extraordinary refraction indices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Slabko V. V., Popov A. K., Myslivets S. A., Rasskazova E. V., Tkachenko V. A., Moskalev A. K.
Заглавие : Transient processes in the parametric interaction of counter-propagating waves
Коллективы : RF Ministry of Education and Science (State Research Task) [2014/71, 2014/K, 3470]; US Army Research Office [W911NF-141-0619]
Место публикации : Quantum Electron.: Turpion, 2015. - Vol. 45, Is. 12. - P.1151-1152. - ISSN 1063-7818, DOI 10.1070/QE2015v045n12ABEH015840. - ISSN 1468-4799(eISSN)
Примечания : Cited References:13. - This work was supported by the RF Ministry of Education and Science (State Research Task 2014-2016, Project Nos 2014/71, 2014/K and 3470) and the US Army Research Office (Grant No. W911NF-141-0619).
Предметные рубрики: LEFT-HANDED METAMATERIALS
NEGATIVE-INDEX
2ND-HARMONIC GENERATION
EXPERIMENTAL-VERIFICATION
OSCILLATOR
REFRACTION
Ключевые слова (''Своб.индексиров.''): transient parametric processes--counter-propagating waves--negative refractive index
Аннотация: We present a comparative analysis of transient processes in media with a negative refractive index for the parametric interaction of co- and counter-propagating waves. The transient time for the interaction of counter-propagating waves is shown to considerably exceed that for the interaction of co- propagating waves. In the case of counter-propagating waves, we present fitting results for the generated wave amplitude as a function of time and for the transient time vs. the amplitude of the pump wave and the length of the medium.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kliava J., Malakhovskii A. V., Edelman I. S., Potseluyko A. M., Petrakovskaja E. A., Melnikova S.V., Zarubina T. V., Petrovskii G., Bruckental Y., Yeshurun Y.
Заглавие : Unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2005. - Vol. 71, Is. 10. - Ст.104406. - ISSN 1098-0121, DOI 10.1103/PhysRevB.71.104406
Примечания : Cited References: 40
Предметные рубрики: ELECTRON-PARAMAGNETIC-RESONANCE
BORATE GLASSES
IONS
BEHAVIOR
GD3+
SPECTROSCOPY
SYSTEMS
GD-3+
FIELD
SHAPE
Ключевые слова (''Своб.индексиров.''): gadolinium--glass--lanthanide--oxide--anisotropy--article--chemical structure--concentration response--electron spin resonance--energy--magnetism--molecular physics--nanoparticle--phase transition--refraction index--temperature sensitivity
Аннотация: Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system {20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in the more heavily doped glasses and ascribed to clustering of Gd3+ ions. Two magnetic phase transitions at 55 and 12 K were detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters containing Gd ions. The overall shape of the EPR spectra shows the presence of clustering at the higher Gd contents. At low temperatures the cluster-related resonance signal is altered in shape, indicating an onset of magnetic anisotropy field. This signal is convincingly fitted to superparamagnetic resonance arising from ferromagnetic nanoparticles. The clustering, depending on the Gd concentration, correlates with a significant shift to lower energies of the strong optical absorption band edge, ascribed to a charge transfer transition between Gd ions. A nonmonotonous change of refractive index with the increase of the Gd content indicates changes in the glass matrix and in Gd cluster structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shetty P. P., Babu M., Maksimov D. N., Bingi J.
Заглавие : Thermo-optic refraction in MoS2 medium for “Normally on” all optical switch
Место публикации : Opt. Mater. - 2021. - Vol. 112. - Ст.110777. - ISSN 09253467 (ISSN), DOI 10.1016/j.optmat.2020.110777
Примечания : Cited References: 25. - Authors acknowledge the funding support from DST India under INT/RUS/RFBR/P-262
Аннотация: Two dimensional (2D) nanomaterials like Molybdenum disulfide (MoS2) have been drawing a lot of interest due to their excellent nonlinear optical response. In this research we study thermal lens formation in MoS2 nanoflakes dispersion using mode mismatched pump probe configuration. Observation of the pump and probe beam intensity patterns gave visual insights on time evolution of photothermal lens formation. Effect of MoS2 nanoflakes concentration on thermo-optic properties of dispersions were studied using thermal lens spectroscopy technique. Further, a thermo-optic refraction based technique to measure thermal lens size is proposed. Thermal lens region size increased with increase in pump power. The observed thermal lens modulation is applied to demonstrate ‘normally on’ all optical switch which showed excellent modulation of output beam signal by pump beam.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shetty P. P., Maksimov D. N., Babu M., Bongu S. R., Bingi J.
Заглавие : Thermo-optic refraction based switchable optical mode converter
Место публикации : J. Quant. Spectrosc. Radiat. Transf. - 2021. - Vol. 274. - Ст.107867. - ISSN 00224073 (ISSN), DOI 10.1016/j.jqsrt.2021.107867
Примечания : Cited References: 30. - Authors acknowledge the funding support from DST India under INT/RUS/RFBR/P-262
Аннотация: The temporally switchable optical mode conversion is crucial for optical communication and computing applications. This research demonstrates such optically switchable mode converter driven by thermo-optic refraction. The MoS2 nanofluid is used as a medium where the thermal microlens is created by a focused laser beam (pump). The convective thermal plume generated above the focal point of the pump beam within the nanofluid acts as an astigmatic thermal lens. It is discovered that mode conversion of the Laguerre-Gaussian (LG) to the Hermite-Gaussian (HG) beam (vice versa) takes place upon passing through the thermal lens. The topological charge of the LG beam can be easily determined using the proposed mode converter. The mode transformation is explained theoretically as the Fourier components of the LG beam undergoing different optical paths while propagating through the convective plume.
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