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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V., Voloshin A. S., Leksikov An. A., Galeev R. G., Shabanov V. F.
Заглавие : A Bandpass Filter Based on Dielectric Layers with a Strip Conductor Subwavelength Grating at Their Interfaces
Место публикации : Dokl. Phys. - 2020. - Vol. 65, Is. 9. - P.343-348. - ISSN 10283358 (ISSN), DOI 10.1134/S1028335820090013
Примечания : Cited References: 12. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation, state assignment no. FEFE-2020-0013 “Development of the Theory of Self-Configurable Machine-Learning Algorithms for Simulating and Predicting Characteristics of Complex Systems”
Аннотация: The design of a multilayer bandpass filter has been investigated, in which each of the half-wavelength resonators consists of two dielectric layers with outer strip conductor gratings in the form of square grids and inner ones in the form of square patches. The grids serve as mirrors with specified reflective properties, which ensure optimal couplings of the outer resonators with free space and optimal coupling between the resonators. The patch gratings make it possible to tune the resonator eigenfrequency during the filter synthesis. The efficiency of the quasi-static calculation of the frequency response for the layered structure is shown for the case of a lattice period smaller than the wavelength in the dielectric and much smaller than the layer thickness. Since the calculation does not require much computing power, the parametric synthesis of the device can be performed on a conventional personal computer. The measured characteristics of the prototype of the synthesized third-order filter with a fractional passband width of ∼10% and a central passband frequency of ∼10.6 GHz are in good agreement with the calculation. The proposed design allows one to fabricate multilayer panels radio transparent in a certain frequency band for hiding microwave antennas.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V., Voloshin A. S., Leksikov An. A., Galeev R. G., Shabanov V. F.
Заглавие : A Bandpass Filter–Polarizer Based on a Dielectric Multilayer with Strip Conductor Gratings
Место публикации : Dokl. Phys. - 2020. - Vol. 65, Is. 7. - P.225-229. - ISSN 10283358 (ISSN), DOI 10.1134/S1028335820050067
Примечания : Cited References: 10. - This study was financially supported by the Ministry of Science and Higher Education of the Russian Federation in the implementation of the integrated project “Creation of a production of earth stations of advanced satellite communications systems to ensure the coherence of hard-to-reach, northern and Arctic territories of Russian Federation,” implemented with the participation of the Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences” (agreement number 075 -11-2019-078 dated 13.12.2019)
Аннотация: A new design of a multilayer bandpass filter is proposed, in which each resonator consists of two identical dielectric layers with parallel strip conductor gratings on their outer surfaces and an orthogonal strip conductor grating between the layers. The filter designed on the basis of crossed gratings works simultaneously as a polarizer transparent in a specified frequency band if the electric field vector of a wave is parallel to the outer strip conductors but reflects waves with an orthogonal polarization. The data from a numerical electrodynamic analysis of a 3D model of the proposed device agree well with the results of the measurements performed on the fifth-order filter–polarizer prototype with a relative bandwidth of 14% and a central frequency of 13.4 GHz. The microwave power loss in the filter passband is ~1.2 dB under parallel polarization of the electromagnetic wave and more than 40 dB under orthogonal polarization.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Braverman V. Ya., Skurikhin D. A., Bayakin S. G., Shabanov V. F., Bashenko V. V.
Заглавие : A device for controlling focusing and penetration depth on the basis of inherent X-radiation in electron beam welding with modulation of the focusing level
Место публикации : Welding International. - 1997. - Vol. 11, n. 7. - P.560-563
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zyryanov V. Ya., Smorgon S. L., Presnyakov V. V., Shabanov V. F.
Заглавие : A device to control polarization and intensity of laser radiation
Коллективы : Russian-Chinese symposium on laser physics and laser technology
Место публикации : Proceedings of the Third Russian-Chinese symposium on laser physics and laser technology. - 1996. - P.98-99

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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Khodenkov S. A., Galeev R. G., Shabanov V. F.
Заглавие : A Lowpass Filter Based on a 2D Microstrip Electromagnetic Crystal
Коллективы : Ministry of Education and Science of the Russian Federation [RFMEFI60417X0179]
Место публикации : Dokl. Phys. - 2019. - Vol. 64, Is. 3. - P.85-89. - ISSN 1028-3358, DOI 10.1134/S1028335819030017. - ISSN 1562-6903(eISSN)
Примечания : Cited References: 14. - This study was supported by the Ministry of Education and Science of the Russian Federation, project no. RFMEFI60417X0179.
Аннотация: A new construction of a lowpass filter was developed based on a two-dimensional microstrip electromagnetic crystal, which had a steeper slope of the frequency response as compared to a filter consisting of a one-dimensional microstrip electromagnetic crystal. The investigated lowpass filter construction is characterized by a high workability and ease of manufacturing. Electrodynamic numerical simulation of the 3D model of the considered microstrip structure agrees well with the experiment, which allows conducting parametric synthesis of devices with the required properties using a personal computer.
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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 : A study of the microwave dielectric permittivity of liquid crystals in electric and magnetic fields
Место публикации : Tech. Phys. - 1998. - Vol. 43, Is. 1. - P.105-109. - ISSN 1063-7842, DOI 10.1134/1.1258946
Примечания : Cited References: 8
Аннотация: A microwave detector based on a self-sustained oscillator circuit is proposed as a means to investigate the real and imaginary components of the dielectric permittivity of liquid crystals in external electric and magnetic fields. Results are given for measurements of a 500 MHz oscillator frequency for two types of nematic crystals, 5CBP and MBBA. Fundamental regularities are identified in the behavior of the microwave dielectric permittivity of samples in electric and magnetic fields. It is shown that the minimum of the high-frequency dielectric loss in liquid crystals correspond to a situation in which the long axes of the molecules are oriented parallel to the direction of the microwave electric field. (C) 1998 American Institute of Physics. [S1063-7842(98)02201-6].
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Khodenkov S. A., Leksikov An. A., Shabanov V. F.
Заглавие : A three-mode microstrip resonator and a miniature ultra-wideband filter based on it
Место публикации : Dokl. Phys.: Maik Nauka-Interperiodica Publishing, 2017. - Vol. 62, Is. 6. - P.289-293. - ISSN 10283358 (ISSN), DOI 10.1134/S102833581706009X
Примечания : Cited References: 14
Ключевые слова (''Своб.индексиров.''): bandpass filters--microwave filters--resonators--filter structures--high selectivity--microstrip resonator--oscillation mode--parametric synthesis--passband frequencies--ultra-wideband filters--wide band filter--microstrip filters
Аннотация: An original microstrip resonator design with a strip conductor split by a slot at one of its ends is investigated. It is demonstrated that at the optimal slot sizes, when the eigenfrequency of the second oscillation mode hits the center between the first and third oscillation modes, the resonator can work as a thirdorder bandpass filter. The structure formed from only two such resonators electromagnetically coupled by split conductor sections is a miniature six-order wideband filter with high selectivity. The test prototype of the filter with a central passband frequency of ~1.2 GHz and a passband width of ~0.75 GHz fabricated on a substrate ~(45 × 11 × 1) mm3 in size with a permittivity of 80 is characterized by minimum loss in a passband of 0.5 dB. The parametric synthesis of the filter structure was performed using electrodynamic analysis of the 3D model. The measured characteristics of the test prototype agree well with the calculated data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Begunovich L. V., Kovaleva E. A., Korshunov M. M., Shabanov V. F.
Заглавие : Absorption spectra of the purple nonsulfur bacteria light-harvesting complex: A DFT study of the B800 part
Колич.характеристики :7 с
Место публикации : J. Photochem. Photobiol. A: Chem. - 2024. - Vol. 450. - Ст.115454. - ISSN 10106030 (ISSN), DOI 10.1016/j.jphotochem.2023.115454. - ISSN 18732666 (eISSN)
Примечания : Cited References: 42. - This work was supported by the state assignment of the Ministry of Science and Higher Education of the Russian Federation. Authors would like to thank Information Technology Centre, Novosibirsk State University for providing access to their supercomputers. L.V.B. would like to thank Irkutsk Supercomputer Center of SB RAS for providing the access to HPC-cluster «Akademik V.M. Matrosov» (Irkutsk Supercomputer Center of SB RAS, Irkutsk: ISDCT SB RAS; http://hpc.icc.ru, accessed 20.10.2023)
Аннотация: We’ve studied the B800 part of Rhodoblastus acidophilus light-harvesting complex (LH2) by several quantum chemical techniques based on the density functional theory (DFT) and determined the specific method and a minimal reliable model suitable for further studies of the LH2. In addition to bacteriochlorophyll a molecules, the minimal model includes two α and one β chain amino acids. Within the model, we are able to reproduce the contribution of the B800 ring of nine bacteriochlorophyll a molecules to the near infrared Qy absorption band. We also discuss the use of hybrid DFT calculations for precise energy and optical estimations and DFT-based tight binding (DFTB) method for the large-scale calculations. Crucial importance of Hartree-Fock exchange interaction for the correct description of B800 peak position was shown.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F., Nazarov V. G., Lapanik V. I., Bezborodov V. S.
Заглавие : Aligning effect of magnetic field on PDLC films during the phase separation
Коллективы : XV International Symposium on Advanced Display Technologies
Место публикации : Proceedings of SPIE - The International Society for Optical EngineeringXV INTERNATIONAL SYMPOSIUM ON ADVANCED DISPLAY TECHNOLOGIES/ sponsors: SPIE Russia Chapter, P.N. Lebedev Physical Institute, Russia, Russian Foundation of Basic Research, Society for Information Display, Russia, European Office of Aerospace Research and Development ; XV International Symposium on Advanced Display Technologies (2006 ; 03.10 - 05.10 ; Moscow). - 2007. - 6637. - С. 66370B. - ISBN 0819467847, DOI 10.1117/12.742662 (Шифр 16957385)
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Alignment of liquid crystals by polymers with residual amounts of solvents
Коллективы : Russian Foundation for Basic Research [15-02-06924, 16-53-00073]
Место публикации : Sci. Rep. - 2017. - Vol. 7. - Ст.3042. - ISSN 2045-2322, DOI 10.1038/s41598-017-03243-5
Примечания : Cited References:21. - This work was supported by the Russian Foundation for Basic Research (project No. 15-02-06924 and No. 16-53-00073).
Предметные рубрики: DISCLINATIONS
INTERFACE
DEFECTS
Аннотация: The homogeneous nematic layers in liquid crystal cells with treated surfaces are affected by orientational transitions in the electric, magnetic, or temperature fields. The liquid crystal structures formed on solid or liquid surfaces find limited application in identifying the liquid-crystal states by the textures observed in polarized light. The use of surfaces prepared from polymer solutions makes it possible to significantly broaden the range of application of the liquid crystal structures. We investigate the structures with the continuous transformation of the nematic director orientation from radial to planar, which were formed by the polycarbonate surface in the presence of different residual solvents. The structures contained the disclination lines that aligned either by a plate rubbed to provide the homogeneous planar orientation in the LC layer or by a magnetic field applied along the polycarbonate film during the structure formation. The orientational transitions caused by surface treatment, temperature, and electric or magnetic fields in these structures are observed. The comparison of temperature critical distance as well as electric and magnetic coherence lengths with equilibrium length calculated from the expression for the free energy of the nematic is performed. The electro-optical characteristics of the nematic structures are obtained.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov A. V., Spiridonov V. P., Shabanov V. F.
Заглавие : An investigation of the temperature dependence of the low frequency raman spectrum of a crystal of Ba(NO3)2
Место публикации : J. Appl. Spectrosc. - 1973. - Vol. 18, Is. 5. - P.677–678. - ISSN 00219037 (ISSN), DOI 10.1007/BF00609342
Примечания : Cited References: 13
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Tyurnev V. V., Shabanov V. F.
Заглавие : An optical bandpass filter based on a three-component multilayer structure
Место публикации : Dokl. Phys.: MAIK Nauka-Interperiodica / Springer, 2014. - Vol. 59, Is. 6. - P.245-248. - ISSN 1028-3358, DOI 10.1134/S1028335814060019. - ISSN 1562-6903
Примечания : Cited References: 10. - This work was supported by the Siberian Branch, Russian Academy of Sciences, Integration project no. 109.
Предметные рубрики: PHOTONIC CRYSTAL
Аннотация: Optical bandpass filters usually represent multi-layer dielectric structures in which the layers with high and low refractive indices alternate. In the case when the mirror layers have a thickness multiple to the quarter wavelength, their reflectance is the largest. In this case, they do not disturb the resonant frequencies of resonators, while the stopbands have an identical depth on both sides of the passband. The optical filters, the multilayer mirrors in which contain only the quarter wavelength layers and are fabricated from two materials, have a substantial disadvantage consisting of the high optical passband ripple. It is related to the impossibility of a smooth fine tuning of the reflectance of such mirrors both between resonators and on the input and output of the filter. The prototype filter contains resonators in the form of half wave-length dielectric layers with a low refractive index, each of which is separated from the next resonator or from free space on the input and output of the device by a multilayer dielectric mirror consisting of quarter wavelength layers.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Arkhipkin V. G., Gunyakov V. A., Myslivets S. A., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Angular tuning of defect modes spectrum in the one-dimensional photonic crystal with liquid-crystal layer
Место публикации : Eur. Phys. J. E. - NEW YORK: SPRINGER, 2007. - Vol. 24, Is. 3. - С. 297-302. - NOV. - ISSN 1292-8941, DOI 10.1140/epje/i2007-10239-7
Примечания : Cited Reference Count: 28
Предметные рубрики: PERIODIC STRUCTURE
REFRACTIVE-INDEX
ENHANCEMENT
LIGHT
LASER
Ключевые слова (''Своб.индексиров.''): 42.25.bs wave propagation, transmission and absorption--42.70.df liquid crystals--42.70.qs photonic bandgap materials--angles of incidence--angular tuning--defect modes--electric polarization--photonic bandgap materials--radiation losses--absorption--defects--light polarization--liquid crystals--one dimensional--phase shift--wave propagation--photonic crystals
Аннотация: A one-dimensional ZrO2/SiO2 photonic crystal with a 4-n -pentyl-4'-cyanobiphenyl (5CB) nematic defect layer was used to investigate the transmission spectra of light polarized parallel and perpendicular to the liquid-crystal director at different angles of incidence. The spectra of the photonic crystal were shown to split into four polarized components T-ij at oblique incidence. When the incident angle increased, the bandgap edges and the defect modes shifted towards short wavelengths, while the amplitudes of the defect modes increased for the transverse magnetic polarization and decreased for the transverse electric polarization. The observed discrepancy between the defect mode amplitudes in the center and near the edges of the photonic bandgap was found to be related to the radiation losses inside the defect layer of a non-ideal photonic crystal. The simulated transmission spectra obtained using recurrence relations and taking into account the decay of defect modes are in good agreement with the experimental data.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shabanov V. F., Vetrov S. Ya., Zharkova G. M., Khachaturyan V. M.
Заглавие : Anomalous light diffraction by cholesterics encapsulated in films
Место публикации : Journal of Molecular Electronics. - 1990. - Vol. 6, Is. 3. - P.141-144
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gunyakov V. A., Sutormin V. S., Timofeev I. V., Shabanov V. F., Zyryanov V. Ya.
Заглавие : Anomalous spectral shift of o-modes in multilayer photonic structure induced by homeotropic–homeoplanar transition in chiral–nematic defect layer
Колич.характеристики :11 с
Место публикации : Photonics. - 2023. - Vol. 10, Is. 9. - Ст.959. - ISSN 23046732 (eISSN), DOI 10.3390/photonics10090959
Примечания : Cited References: 39
Аннотация: A chiral nematic is embedded between multilayer mirrors to obtain voltage-inducible polarized resonance spectra. Initially, the nematic director is uniformly oriented perpendicular to the mirrors’ surfaces because the chiral nematic helix is completely untwisted due to the homeotropic boundary conditions specified by the adsorbed cations. Then, a voltage is applied to remove the layer of surface-active cations from the input mirror. The obtained twisted homeoplanar configuration has a helix pitch exceeding the layer’s thickness. The twisting leads to the anomalous blue shift of the o-modes in the transmittance spectrum of the photonic structure. This blue shift can be effectively compensated by repulsion of spectral peaks as a result of mode coupling in the vicinity of the virtual avoided crossing point. The experimental results obtained are confirmed numerically using the 4 ˣ 4 transfer matrix method and explained with the contribution of a geometric phase.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Drokin N. A., Shabanov V. F., Shepov V. N.
Заглавие : Behavior of high-friequency dielectric spectra of liquid crystals nCB and nOCB
Место публикации : Proc. of SPIE. - 2002. - Vol. 4759. - P.282-284. - ISSN 0277-786X. - ISSN 978-0-81948-566-3
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F., Nazarov V. G.
Заглавие : Bipolar-homogeneous structural phase transition in nematic droplets formed in the polymer matrix in a magnetic field
Место публикации : Crystallogr. Rep. - New York: Maik Nauka/Interperiodica/Springer, 2009. - Vol. 54, Is. 7. - С. 1191-1196. - DEC. - ISSN 1063-7745, DOI 10.1134/S1063774509070098
Примечания : Cited Reference Count: 19. - Гранты: This study was supported by the Council on Grants from the President of the Russian Federation for the Support of Leading Scientific Schools ( grant no. NSh-3818.2008.3), the Russian Foundation for Basic Research ( project no. 08-03-01007), the Presidium of the Russian Academy of Sciences ( project no. 27.1), and the Siberian Branch of the Russian Academy of Sciences ( project nos. 110 and 144).Финансирующая организация: President of the Russian Federation [NSh-3818.2008.3]; Russian Foundation for Basic Research [08-03-01007]; Russian Academy of Sciences [27.1, 110, 144]
Предметные рубрики: DISPERSED LIQUID-CRYSTALS
FRANK CONSTANTS
ALIGNMENT
Ключевые слова (''Своб.индексиров.''): bipolar configuration--bipolar structure--cyanobiphenyls--homogeneous structure--mutual transformations--nematic director--nematic droplets--order parameter--poly(vinyl butyral)--structural phase transition--temperature range--thermal fluctuations--crystal structure--drop formation--liquid crystals--magnetic fields--nematic liquid crystals--phase transitions
Аннотация: The phase transition from the bipolar structure to the homogeneous structure in droplets formed from the nematic liquid crystal 4-n-pentyl-4'-cyanobiphenyl in poly(vinyl butyral) in the presence of a magnetic field has been investigated. The phase transition is associated with the expansion of the regions with a tilted orientation of the director in the vicinity of defects (the disappearance of boojums) and with the alignment of the nematic director lines in the bulk of the droplet in the direction of the magnetic field. In the temperature range T = 24-34A degrees C, cyclic mutual transformations between the bipolar configuration of the nematic director and the homogeneous structure, which have a period of similar to 0.5-3.5 s and result from thermal fluctuations of the order parameter, are observed in droplets 3-15 A mu m in size after the forming field is switched off.
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18.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Parshin A. M., Nazarov V. G., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Bistable director configurations in polymer dispersed nematic liquid crystals
Коллективы : IInternational LC Conference
Место публикации : 22nd International LC Conference: Abstracts. - 2008. - Vol. 1. - P.382
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. A., Shabanov V. F.
Заглавие : Boson peak in low-frequency Raman spectra of polymethylmethacrylate
Место публикации : Optoelectron. Instrum. Data Proces.: Allerton Press, 2016. - Vol. 52, Is. 6. - P.580-584. - ISSN 87566990 (ISSN), DOI 10.3103/S875669901606008X
Примечания : Cited References: 23
Ключевые слова (''Своб.индексиров.''): boson peak--raman spectra--anharmonicity--modeling
Аннотация: The role of the local field, anharmonicity, and degree of disorder in the formation of the boson peak has been studied. The low-frequency Raman spectrum of a model polymethylmethacrylate crystal with disorder elements was calculated using the method of atom-atom potentials taking into account the effect of local fields on the spectrum. The calculations were carried out for a crystal containing rigid molecules of an isotactic polymethylmethacrylate oligomer and for a structure with flexible molecules. © 2016, Allerton Press, Inc.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pyatnov M. V., Bikbaev R. G., Timofeev I. V., Ryzhkov I. I., Vetrov S. Ya., Shabanov V. F.
Заглавие : Broadband Tamm plasmons in chirped photonic crystals for light-induced water splitting
Место публикации : Nanomaterials. - 2022. - Vol. 12, Is. 6. - Ст.928. - ISSN 20794991 (ISSN), DOI 10.3390/nano12060928
Примечания : Cited References: 41
Аннотация: An electrode of a light-induced cell for water splitting based on a broadband Tamm plasmon polariton localized at the interface between a thin TiN layer and a chirped photonic crystal has been developed. To facilitate the injection of hot electrons from the metal layer by decreasing the Schottky barrier, a thin n-Si film is embedded between the metal layer and multilayer mirror. The chipping of a multilayer mirror provides a large band gap and, as a result, leads to an increase in the integral absorption from 52 to 60 percent in the wavelength range from 700 to 1400 nm. It was shown that the photoresponsivity of the device is 32.1 mA/W, and solar to hydrogen efficiency is 3.95%.
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