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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V.
Заглавие : Analysis of the quality factor of the optical half-wavelength resonator
Место публикации : Microwave Opt. Techn. Lett. - 2013. - Vol. 55, Is. 7. - P.1613-1616. - DOI 10.1002/mop.27662
Аннотация: An electrodynamic analysis of an optical resonator comprising a half-wavelength dielectric layer that is covered from both sides by quarter-wavelength layers with higher and lower refractive indices (RIs) is carried out.For such a resonator, the dependences of the external quality factor on number and RIs of the layers are obtained first. That allows one to determine minimum number of the layers in the structure to achieve the required quality factor at practically any contrast of the RIs. The results of this study provide an easy way to optimize the structures of 1D photonic crystal devices, particularly high-selectivity bandpass filters.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Dielectric and optical properties of a 5-propyl-2-(p-cyanophenyl)-pyridine liquid crystal
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 4. - P797-801. - ISSN 1063-7834, DOI 10.1134/1.1569024
Примечания : Cited References: 12
Предметные рубрики: DECIMETER WAVELENGTH RANGE
SERIES
SPECTRA
5CB
Аннотация: The temperature dependences of the dielectric and optical parameters for a 5-propyl-2-(p-cyanophenyl)-pyridine (3CP) liquid crystal are investigated in the vicinity of the nematic-isotropic phase transition. The dielectric spectra of the 3CP compound in the crystalline, nematic, and isotropic phases are measured in the frequency range 1-1000 MHz, and the Debye approximations of the measured spectra are obtained. Analysis of the dependence of the static permittivity on the director orientation with respect to the direction of the electric pump field demonstrates that the angle between the dipole moment and the long axis of the molecule is approximately equal to 15degrees. (C) 2003 MAIK "Nauka / Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F.
Заглавие : Reconstruction of the distribution function of relaxation times for 7CB and 7OCB liquid crystals from dielectric spectra
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 48, Is. 5. - P973-978. - ISSN 1063-7834, DOI 10.1134/S106378340605026X
Примечания : Cited References: 16
Предметные рубрики: DECIMETER WAVELENGTH RANGE
FEATURES
Аннотация: A technique for reconstructing the distribution function of relaxation times from the dielectric spectra measured over a wide range of frequencies is proposed and tested using 7CB and 7OCB liquid crystals as examples. The objective function, which is the sum of the squares of the differences between the calculated and measured permittivities, is minimized with the Mathcad program package. It is demonstrated that, in the case of parallel orientation of the molecular director with respect to the polarization of the ac electric field, the distribution function of relaxation times is consistent with the Debye relaxation model; however, there are insignificant deviations in the short-time interval corresponding to the high-frequency portion of the dielectric spectrum. For perpendicular orientation of the director, the distribution function of relaxation times exhibits specific features that are most pronounced for the 7OCB liquid crystal and probably reflect intramolecular motions of the rigid core and fragments of the alkyl chain.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bulgakov E. N., Maksimov D. N.
Заглавие : Nonlinear response from optical bound states in the continuum
Коллективы : Ministry of Education and Science of Russian Federation [N 3.1845.2017/4.6]
Место публикации : Sci Rep. - 2019. - Vol. 9. - Ст.7153. - ISSN 2045-2322, DOI 10.1038/s41598-019-43672-y
Примечания : Cited References: 48. - This work was supported by Ministry of Education and Science of Russian Federation (state contract N 3.1845.2017/4.6). We appreciate discussions with Ya Yan Lu, Lijun Yuan, Andrey M. Vyunishev, and Ivan V. Timofeev.
Предметные рубрики: WAVE-GUIDE
WAVELENGTH
RESONANCES
SILICON
LIGHT
Аннотация: We consider nonlinear effects in scattering of light by a periodic structure supporting optical bound states in the continuum. In the spectral vicinity of the bound states the scattered electromagnetic field is resonantly enhanced triggering optical bistability. Using coupled mode approach we derive a nonlinear equation for the amplitude of the resonant mode associated with the bound state. We show that such an equation for the isolated resonance can be easily solved yielding bistable solutions which are in quantitative agreement with the full-wave solutions of Maxwell's equations. The coupled mode approach allowed us to cast the the problem into the form of a driven nonlinear oscillator and analyze the onset of bistability under variation of the incident wave. The results presented drastically simplify the analysis nonlinear Maxwell's equations and, thus, can be instrumental in engineering optical response via bound states in the continuum.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Dielectric anisotropy of 5CB liquid crystal in a decimeter wavelength range
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 3. - P577-579. - ISSN 1063-7834, DOI 10.1134/1.1131251
Примечания : Cited References: 7
Аннотация: Parallel and perpendicular components of the dielectric constant for 5CB nematic liquid crystal are measured in a relaxation region. Two frequencies f(1) approximate to 30 and f(2) approximate to 350 MHz are determined at which the inversion of the dielectric anisotropy sign is observed. It is shown that the observed sizable high-frequency shift of f(2) with respect to the value calculated according the Debye theory is caused by the dielectric resonance near the relaxation region. (C) 2000 MAIK "Nauka/Interperiodica".
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vyunishev A. M., Myslivets S. A., Fokin V. A., Volochaev M. N., Smolyarova T. E., Radionov N. V., Zaitsev A. I., Arkhipkin V. G., Chirkin A. S.
Заглавие : Dual wavelength Talbot self-imaging using facet patterned nonlinear crystals
Коллективы : Russian Science Foundation (RSF) [19-12-00203]
Место публикации : Opt. Lett. - 2019. - Vol. 44, Is. 15. - P.3761-3764. - ISSN 0146-9592, DOI 10.1364/OL.44.003761. - ISSN 1539-4794(eISSN)
Примечания : Cited References: 19. - Russian Science Foundation (RSF) (19-12-00203).
Предметные рубрики: RAMAN-NATH DIFFRACTION
LITHOGRAPHY
FIELD
Аннотация: A method for functional patterning of facets of a nonlinear crystal using focused ion beam milling has been developed. The near-field diffraction on periodic gratings has been experimentally and theoretically studied. The periodicity of the structure enables Talbot self-imaging at the fundamental and second-harmonic frequencies simultaneously. Spatial interference patterns for both harmonic frequencies are individual ones, which can enable the higher-accuracy optical testing, coupling the radiation at both frequencies, and wavelength-division demultiplexing. The impact of the aperture effect on a Talbot carpet is discussed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. A., Shabanov A. V., Bukhanov E. R., Shabanov V. F.
Заглавие : Effect of long-period ordering of the structure of a plant on the initial stages of photosynthesis
Место публикации : Dokl. Phys. - 2018. - Vol. 63, Is. 1. - P.1-4. - ISSN 10283358 (ISSN), DOI 10.1134/S1028335818010068
Примечания : Cited References: 15
Ключевые слова (''Своб.индексиров.''): electromagnetic fields--plants (botany)--density of photonic state--long wavelength--photosystems--plant leaves--soft modes--stopband--two bands--water dissociation--transfer matrix method
Аннотация: Using data on the structure of plant leaves, specific features of light propagation in biophotoniccrystal structures have been established by the transfer matrix method. Splitting of the stopband in two bands has been found. The density of photonic states and the electromagnetic field value have been calculated. The occurrence of two photosystems (splitting of the stopband in two bands), the peculiarity of the long-wavelength quantum yield and its enhancement (Emerson effect), and water dissociation in the soft mode due to an increase in the electromagnetic field on the layers are explained.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Trabs P., Noack F., Aleksandrovsky A. S., Zaitsev A. I., Petrov V.
Заглавие : Generation of coherent vacuum UV radiation in randomly quasi-phase-matched strontium tetraborate
Коллективы : Conference on Lasers and Electro-Optics
Место публикации : Conference on Lasers and Electro-Optics Europe - Technical Digest: IEEE-Institute Electrical and Electronics Engineers, 2015. - Vol. 2015-August. - ISSN 9781557529688 (ISBN)
Ключевые слова (''Своб.индексиров.''): crystals--frequency conversion--harmonic analysis--nonlinear optics--optical harmonic generation--optical pulses--wavelength measurement
Аннотация: Tunable coherent radiation is generated in the VUV down to 121 nm using random quasi-phase-matching in strontium tetraborate, the shortest wavelength ever produced with a second-order nonlinear optical process in a solid-state material. © 2015 OSA.
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Вид документа : Статья из сборника (выпуск монографической серии)
Шифр издания :
Автор(ы) : Govorun I. V., Leksikov A. A., Serzhantov A. M.
Заглавие : Features of the coupling coefficients of microstrip irregular quarter-wavelength resonators
Коллективы : International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering
Место публикации : 13th International Scientific-Technical Conference on Actual Problems of Electronic Instrument Engineering (APEIE): IEEE, 2017. - Vol. 4. - P.29-32. - (International Conference on Actual Problems of Electronic Instrument)
Примечания : Cited References:9
Предметные рубрики: HAIRPIN RESONATORS
Ключевые слова (''Своб.индексиров.''): microstrip resonator--coupling coefficient--inductive and capacitive--interactions--damping pole
Аннотация: In the present work on the base of modified energy approach a behavior of the frequency-dependent coupling coefficient of pair microstrip stepped-impedance quarter-wavelength resonators was investigated. It is revealed that at a certain gap between the resonators the total coefficient of coupling becomes zero due to mutual compensation of coefficients describing inductive and capacitive interactions between the resonators.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : High-frequency dielectric spectra from liquid crystals of series nCB and nOCB
Место публикации : Tech. Phys.: AMER INST PHYSICS, 2002. - Vol. 47, Is. 4. - P470-473. - ISSN 1063-7842, DOI 10.1134/1.1470597
Примечания : Cited References: 8
Предметные рубрики: DECIMETER WAVELENGTH RANGE
RELAXATION
SPECTROSCOPY
PHASES
Аннотация: The design of a resonant frequency-tunable high-sensitivity microstrip sensor is suggested. The permittivity dispersion of liquid crystals of two homologic series, alkylcyanobiphenyls (7CB and 8CB) and alkyloxycyanobiphenyls (7OCB and 8OCB), is studied at frequencies of 100-900 MHz. The dielectric spectra are shown to be the sum of the Debye relaxation and dielectric resonances observed at f approximate to 160, 280, 360, 450, 550, and 650 MHz. The dielectric resonances are present in the spectra of all the samples in both the nematic and isotropic phase. The substitution of an oxygen atom (series nOCB) for a carbon atom (series nCB) in liquid crystal molecules has a minor effect on the dielectric resonance frequencies but changes the resonance intensities and splits some of the resonance lines. (C) 2002 MAIK "Nauka / Interperiodica".
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tsipotan A. S., Gerasimova M. A., Slabko V. V., Aleksandrovsky A. S.
Заглавие : Laser-induced wavelength-controlled self-assembly of colloidal quasi-resonant quantum dots
Коллективы : Grant of Ministry of Education and Science of the Russian Federation [3.1749.2014/K, 214/71]; RFBR [14-02-00219 A]
Место публикации : Opt. Express: Optical Society of America, 2016. - Vol. 24, Is. 10. - P.11145-11150. - ISSN 1094-4087, DOI 10.1364/OE.24.011145
Примечания : Cited References:18. - This research is partially supported by Grant of the Ministry of Education and Science of the Russian Federation for Siberian Federal University (projects No 3.1749.2014/K, 214/71) and RFBR, research project No. 14-02-00219 A.
Предметные рубрики: Organized aggregation
Metal nanoparticles
Optical binding
Dynamics
Field
Аннотация: Self-assembly of colloidal semiconductor quantum dots controlled solely by laser-induced interaction is demonstrated for the first time. Pairs of CdTe nanoparticles are formed under irradiation with nanosecond pulses at wavelengths 555 or 560 nm. Formation of pairs is justified by corresponding changes of absorption spectra. Conditions of the experiment are in excellent agreement with those predicted by the theory of laser-induced dipole-dipole interaction of QDs. The fraction of QDs assembled into pairs is up to 47%. (C) 2016 Optical Society of America
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Polyakov V. V., Polyakova K. P., Seredkin V. A., Patrin G. S.
Заглавие : Magneto-optical Kerr effect enhancement in Co-Ti-O nanocomposite films
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P.506-509. - ISBN 1012-0394, DOI 10.4028/www.scientific.net/SSP.190.506. - ISBN 9783037854365
Ключевые слова (''Своб.индексиров.''): kerr effect--magneto-optical properties--nanocomposite films--nanogranular films--co films--kerr rotation angle--layer structures--layered structures--magnetic phase--magneto-optical kerr effects--magneto-optical spectra--magnetooptical properties--metal film--nanogranular films--volume concentration--wavelength ranges--kerr magnetooptical effect--magnetic materials--metallic films--nanocomposite films--optical kerr effect--optical properties--wavelength--cobalt
Аннотация: Co-Ti-O nanogranular films with different volume concentrations of a magnetic phase and Co/Ti-O layered structures with different numbers of layer pairs are studied by the magnetooptical Kerr effect. It is shown that, unlike the case of homogeneous metal films, the magnetooptical spectra of the nanogranular films exhibit resonance with a significant increase in the Kerr rotation angle in the wavelength range 500-700 nm. It is found that the Kerr rotation angle of the Co/Ti-O layer structures in the wavelength range 500-600 nm grows by an order of magnitude as compared to its value for ordinary Co films. В© (2012) Trans Tech Publications.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Potseluyko A. M., Edelman I. S., Zabluda V. N., Bolsunovskaya O. A., Zamkov A. V., Parshikov S. A., Zaytsev A. I.
Заглавие : Magnetooptic activity of f-d and f-f electron transitions in Pr3+ in the glass matrix LiB3O5
Место публикации : Physica B. - 2000. - Vol. 291, Is. 1-2. - P.89-96. - ISSN 0921-4526, DOI 10.1016/S0921-4526(99)01869-4
Примечания : Cited References: 17
Предметные рубрики: FARADAY-ROTATION
OXIDE GLASSES
Ключевые слова (''Своб.индексиров.''): faraday rotation--magnetooptic activity--praseodymium--electron transitions--faraday effect--light absorption--lithium compounds--praseodymium compounds--faraday rotation--transition wavelength--optical glass
Аннотация: The results of absorption, Faraday rotation and magnetic circular dichroism measurements for glasses with the composition of LiB3O5 + Pr2O3 are presented. The effective wavelength of the transition giving the main contribution to Faraday rotation in these glasses is determined. The contributions of several f-f transitions to Faraday rotation are separated and their magnetooptical activities are evaluated in comparison with the activity of the f-d transition. (C) 2000 Elsevier Science B.V. All rights reserved.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yang Z. -Y., Ishii S., Yokoyama T., Dao T. D., Sun M. -G., Pankin P. S., Timofeev I. V., Nagao T., Chen K. -P.
Заглавие : Narrowband wavelength selective thermal emitters by confined tamm plasmon polaritons
Место публикации : ACS Photonics: American Chemical Society, 2017. - Vol. 4, Is. 9. - P.2212-2219. - ISSN 23304022 (ISSN), DOI 10.1021/acsphotonics.7b00408
Примечания : Cited References: 41. - This work was supported by the Ministry of Science and Technology (MOST), Taiwan, ROC (MOST 104-2221-E-009-130-MY3)
Ключевые слова (''Своб.индексиров.''): narrowband absorber--tamm plasmon polaritons--thermal emission
Аннотация: This study experimentally demonstrates infrared wavelength selective thermal emission based on Tamm plasmon polaritons (TPPs). Unlike conventional TPP structures, which have a thin metal layer on a distributed Bragg reflector (DBR), the proposed structure has a thick metal under a DBR that is more robust for thermal radiation. The number of DBR pairs is a critical factor in maximizing the narrowband emission needed to satisfy the impedance matching condition, which varies with the choice of metal film. Optimum designs for four different metals, aluminum, gold, molybdenum, and tungsten, are presented. The temporal coupled-mode theory was introduced to explain the origin of the high Q-factor of the proposed structure, which can achieve a twice higher Q-factor for the measured emissivity compared to typical plasmonic thermal emitters. The structure is one-dimensional, consisting of only multilayers and free from nanopatterning, offering a practical design in applications such as gas sensing, narrowband IR sources, and thermophotovoltaics. © 2017 American Chemical Society.
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Permittivity of liquid crystals of the alkylcyanobiphenyl group in a decimeter wavelength range
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2000. - Vol. 42, Is. 5. - P987-989. - ISSN 1063-7834, DOI 10.1134/1.1131324
Примечания : Cited References: 9
Аннотация: The high-frequency dielectric spectra of liquid crystals of the alkylcyanobiphenyl group with various length of the mobile alkyl chain CnH2n+1 (n = 5-8) are experimentally studied. It is established that a resonance feature is observed in the frequency range of 300 MHz for all the crystals on the high-frequency branch of the orientational part of dielectric spectra. It is shown that the position of the dielectric resonance is virtually independent of the temperature and the degree of crystal dilution by benzene, but its intensity essentially depends on both factors. The nature of the dielectric resonance found is probably caused by the intramolecular motion of methylene fragments, which are strongly bound with a rigid core of molecules. (C) 2000 MAIK "Nauka/Interperiodica".
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Chen M., Xia Z., Molokeev M. S., Lin C. C., Su C., Chuang Y. -C., Liu Q.
Заглавие : Probing Eu2+ luminescence from different crystallographic sites in Ca10M(PO4)7:Eu2+ (M = Li, Na, and K) with β-Ca3(PO4)2-type structure
Место публикации : Chem. Mater.: American Chemical Society, 2017. - Vol. 29, Is. 17. - P.7563-7570. - ISSN 08974756 (ISSN), DOI 10.1021/acs.chemmater.7b02724
Примечания : Cited References: 34. - The present work was supported by the National Natural Science Foundation of China (Grants 51722202, 91622125, and 51572023), Natural Science Foundations of Beijing (2172036), and Fundamental Research Funds for the Central Universities (FRF-TP-16-002A3). C.C.L. and C.C.S. acknowledge the financial support from the Ministry of Science and Technology of Taiwan (Contract No. MOST 104-2113-M-027-007-MY3), and M. Molokeev acknowledges support of the Russian Foundation for Basic Research (17-52-53031).
Ключевые слова (''Своб.индексиров.''): calcium--doping (additives)--excited states--light emission--lithium--luminescence--phosphors--photoluminescence--positive ions--rietveld refinement--single crystals--color tuning--crystallographic sites--different distributions--emission bands--local environments--long wavelength bands--luminescent centers--power diffraction data--europium
Аннотация: Eu2+ local environments in various crystallographic sites enable the different distributions of the emission and excitation energies and then realize the photoluminescence tuning of the Eu2+ doped solid state phosphors. Herein we report the Eu2+-doped Ca10M(PO4)7 (M = Li, Na, and K) phosphors with β-Ca3(PO4)2-type structure, in which there are five cation crystallographic sites, and the phosphors show a color tuning from bluish-violet to blue and yellow with the variation of M ions. The difference in decay rate monitored at selected wavelengths is related to multiple luminescent centers in Ca10M(PO4)7:Eu2+, and the occupied rates of Eu2+ in Ca(1), Ca(2), Ca(3), Na(4), and Ca(5) sites from Rietveld refinements using synchrotron power diffraction data confirm that Eu2+ enters into four cation sites except for Ca(5). Since the average bond lengths d(Ca-O) remain invariable in the Ca10M(PO4)7:Eu2+, the drastic changes of bond lengths d(M-O) and Eu2+ emission depending on the variation from Li to Na and K can provide insight into the distribution of Eu2+ ions. It is found that the emission band at 410 nm is ascribed to the occupation of Eu2+ in the Ca(1), Ca(2), and Ca(3) sites with similar local environments, while the long-wavelength band (466 or 511 nm) is attributed to Eu2+ at the M(4) site (M = Na and K). We show that the crystal-site engineering approach discussed herein can be applied to probe the luminescence of the dopants and provide a new method for photoluminescence tuning.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrovsky A.S., Vyunishev A.M., Zaitsev A.I., Slabko V.V.
Заглавие : Random quasi-phase-matched conversion of broadband radiation in a nonlinear photonic crystal
Место публикации : Phys. Rev. A. - 2010. - Vol. 82, Is. 5. - ISSN 1050-2947, DOI 10.1103/PhysRevA.82.055806
Примечания : Cited Reference Count: 22. - Гранты: The work was supported by the Ministry of Education and Science of the Russian Federation (Contract 16.740.11.0150), Grant of the President of the Russian Federation for the support of leading scientific schools No. SS-4645.2010.2, Grant No. RNP.2.1.1.3455, Projects 2.5.2 and 3.9.1 of PSB RAS, and Projects No. 27.1 and No. 5 of SB RAS. A. M. Vyunishev is grateful for the support from Krasnoyarsk Regional Fund of Science and Technical Activity Support.Финансирующая организация: Ministry of Education and Science of the Russian Federation [16.740.11.0150]; Russian Federation for the support of leading scientific schools [SS-4645.2010.2, RNP.2.1.1.3455]; PSB RAS [2.5.2, 3.9.1]; SB RAS [27.1, 5]; Krasnoyarsk Regional Fund of Science and Technical Activity
Ключевые слова (''Своб.индексиров.''): broad spectrum--broadband radiation--femtosecond laser pulse--fundamental wave--nonlinear generation--nonlinear photonic crystals--quasi-phase-matched--quasi-phase-matched frequency doubling--red shift--shorter wavelength--tetraborate--tuning ranges--vacuum ultraviolets--band structure--crystal structure--strontium--ultrafast lasers--ultrashort pulses--photonic crystals
Аннотация: Radiation in the range 187.5-215 nm was generated via random quasi-phase-matched frequency doubling of femtosecond laser pulses in nonlinear photonic crystals of strontium tetraborate. Abroad spectrum of fundamental radiation favors the probing of the nonlinear photonic crystal band structure. The red shift of the band structure upon the fundamental wave-vector rotation was observed. No principal limitations of the tuning range at its shorter wavelength boundary from the nonlinear photonic crystal (NPC) material are found. Calculation shows that the NPC structure enables enhancement of nonlinear generation in the vacuum ultraviolet.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popov A. K., Myslivets S. A., Slabko V. V., Tkachenko V. A., George T. F.
Заглавие : Shaping light in backward-wave nonlinear hyperbolic metamaterials
Коллективы : U. S. Army Research Office [W911NF-14-1-0619]; Ministry of Education and Science of the Russian Federation [3.6341.2017/6.7]
Место публикации : Photonics. - 2018. - Vol. 5, Is. 2. - Ст.8. - ISSN 2304-6732, DOI 10.3390/photonics5020008
Примечания : Cited References: 46. - Alexander K. Popov acknowledges support by the U. S. Army Research Office under grant number W911NF-14-1-0619. Vitaly V. Slabko acknowledges support by the Ministry of Education and Science of the Russian Federation (project # 3.6341.2017/6.7).
Предметные рубрики: NEGATIVE-INDEX METAMATERIALS
OPTICAL PARAMETRIC OSCILLATOR
Ключевые слова (''Своб.индексиров.''): optical metamaterials--fundamental concepts in photonics--light-matter--interactions at the subwavelength and nanoscale--fundamental--understanding of linear and nonlinear optical processes in novel metamaterials underpinning photonic devices and components--advancing the frontier of nanophotonics with the associated nanoscience and nanotechnology--nanostructures that can serve as building blocks for nano-optical systems--use of nanotechnology in photonics--nonlinear nanophotonics--plasmonics and excitonics--subwavelength components and negative index materials--slowing, store, and processing light pulses--materials for optical sensing, for tunable optical delay lines, for optical buffers, for high extinction optical switches, for novel image processing hardware, and for highly-efficient wavelength converters
Аннотация: Backward electromagnetic waves are extraordinary waves with contra-directed phase velocity and energy flux. Unusual properties of the coherent nonlinear optical coupling of the phase-matched ordinary and backward electromagnetic waves with contra-directed energy fluxes are described that enable greatly-enhanced frequency and propagation direction conversion, parametrical amplification, as well as control of shape of the light pulses. Extraordinary transient processes that emerge in such metamaterials in pulsed regimes are described. The results of the numerical simulation of particular plasmonic metamaterials with hyperbolic dispersion are presented, which prove the possibility to match phases of such coupled guided ordinary and backward electromagnetic waves. Particular properties of the outlined processes in the proposed metamaterial are demonstrated through numerical simulations. Potential applications include ultra-miniature amplifiers, frequency changing reflectors, modulators, pulse shapers, and remotely actuated sensors.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Specific features of the approximation of the dielectric spectra of alkylcyanobiphenyl liquid crystals
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2003. - Vol. 45, Is. 3. - P598-602. - ISSN 1063-7834, DOI 10.1134/1.1562253
Примечания : Cited References: 16
Предметные рубрики: DECIMETER WAVELENGTH RANGE
SERIES
RELAXATION
Аннотация: The frequency dependences of the longitudinal and transverse permittivities of oriented nematic liquid crystals belonging to the alkylcyanobiphenyl group nCB (n = 5-8) are measured in the relaxation region in the meter and decimeter wavelength ranges. It is established that the dispersion of the longitudinal permittivity is well approximated by the sum of two Debye processes with different relaxation times. The frequency dependence of the transverse permittivity is represented by the dispersion relation with a continuous distribution of relaxation times in a specified time range. It is demonstrated that, in the high-frequency range (f 200 MHz), in which the dielectric spectra exhibit a number of weakly pronounced dispersion features, the total dispersion of the permittivity is adequately described by the sum of relaxation and resonance processes. (C) 2003 MAIK "Nauka/Interperiodica".
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Specific features of the dielectric spectra of the liquid crystal 5CB in the decimeter wavelength range
Место публикации : JETP Letters. - 1997. - Vol. 66, Is. 4. - P.271-274. - ISSN 0021-3640, DOI 10.1134/1.567466
Примечания : Cited References: 6
Аннотация: The dispersion and anisotropy of the permittivity of the liquid crystal 5CB in the solid, nematic, and isotropic phases are investigated at frequencies ranging from 50 to 1000 MHz using discretely tunable hybrid microstrip cavities, Resonance features which grow with increasing temperature are observed in the dielectric spectra. It is found that the section of the dispersion which is due to oriented vibrations of the mesophase molecules covers the frequency range almost up to 300 MHz, and the resonances found could be due to conformational vibrations of the molecules. (C) 1997 American Institute of Physics.
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