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Photoluminescence spectroscopy investigation of epitaxial Si/GaSb nanocrystals/Si heterostructure

AIP Conference Proceedings 2017年第1期1874卷

作者： Dmitry L. Goroshko Alexander V. Shevlyagin Evgeniy A. Chusovitin Sergey A. Dotsenko Anton K. Gutakovskii M. Iinuma Y. Terai Evgeniy Yu. Subbotin Nikolay G. Galkin 1Institute of Automation and Control Processes FEB RAS 5 Radio St. 690041 Vladivostok Russia 2Far Eastern Federal University 8 Sukhanova St. 690950 Vladivostok Russia 3Rzhanov Institute of Semiconductor Physics SB RAS Lavrentieva Ave.13 Novosibirsk Russia 4Kyushu Institute of Technology Department of Computer Science and Electronics 680-4 Kawazu Iizuka Fukuoka 820-8502 Japan

Two-layer heterostructure with GaSb nanocrystals formed by solid phase epitaxy and embedded into the silicon was investigated using low-temperature (10-140 K) photoluminescence and time-resolved photoluminescence spectroscopies. Two characteristic luminescence bands with a maximum of about 0.82 and 0.87 eV were observed. It was found that low-energy peak is associated with D1 dislocation-related luminescence in silicon. Analysis of the decay components together with temperature and power dependencies of the photoluminescence for the high-energy maximum revealed that emission is more likely originated from the combined D2 dislocation centers in silicon and radiative recombination in type–II band alignment Si/GaSb nanocrystals/Si heterostructure. A nonradiative recombination dominates in all temperature range studied.

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On numerical model of time-dependent processes in three-dimensional porous heat-releasing objects

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AIP Conference Proceedings 2016年第1期1770卷

作者： Nickolay A. Lutsenko 1Institute of Automation and Control Processes FEB RAS Vladivostok Russia 2Far Eastern Federal University Vladivostok Russia

The gas flows in the gravity field through porous objects with heat-releasing sources are investigated when the self-regulation of the flow rate of the gas passing through the porous object takes place. Such objects can appear after various natural or man-made disasters (like the exploded unit of the Chernobyl NPP). The mathematical model and the original numerical method, based on a combination of explicit and implicit finite difference schemes, are developed for investigating the time-dependent processes in 3D porous energy-releasing objects. The advantage of the numerical model is its ability to describe unsteady processes under both natural convection and forced filtration. The gas cooling of 3D porous objects with different distribution of heat sources is studied using computational experiment.

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Optical properties of CdS-glass nanocomposites

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AIP Conference Proceedings 2017年第1期1874卷

作者： Ivan D. Popov Yulia V. Kuznetsova Alexander A. Sergeev Svetlana V. Rempel Andrey A. Rempel 1Institute of Solid State Chemistry Ural Branch of the Russian Academy of Sciences 620990 Ekaterinburg Pervomaiskaya St. 91 Russia 2Institute of Automation and Control Processes Far East Branch the Russian Academy of Sciences 690041 Vladivostok Radio St. 5 Russia 3Ural Federal University named after the first President of Russia B.N.Yeltsin 620002 Ekaterinburg Mira St. 19 Russia

CdS-glass nanocomposite included CdS nanoparticles in it have been synthesized. CdS nanoparticles in silicate glass matrix have an average diameter from 3 to 7.5 nm depending on a heat treatment regime. As was demonstrated using the methods of spectrophotometry and luminescence in the UV, visible and NIR optical ranges, optical properties of the nanocomposite significantly depends on the size of nanoparticles. The high temperature treatment has lead to increase the luminescence intensity. At the same time, the contribution of the lifetime of the slower decay component was increased.

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Surface and subsurface refractive index mapping by spherical optical antenna

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AIP Conference Proceedings 2017年第1期1874卷

作者： Stanislav Gurbatov Aleksandr Kuchmizhak Oleg Vitrik Yuri Kulchin 1Far Eastern Federal University 8 Sukhanova Str. Vladivostok 690950 Russia 2Institute for Automation and Control Processes Far Eastern Branch of Russian Academy of Science 5 Radio Str. Vladivostok 690041 Russia

Finite-difference time-domain (FDTD) calculations of the scattering spectra of a 100-nm diameter Ag spherical nanoparticle lying on a transparent substrate were performed under various excitation regimes to estimate the spectral shift of the dipole and quadrupole localized surface plasmon resonances (LSPRs) as a function of the substrate refractive index (RI). The LSPR spectral shift was shown to be defined by the characteristic near-field energy distribution assigned by the polarization direction of the radiation exciting nanoantenna. For the optimized excitation conditions, spectral registration of the dipole shift was shown to provide the lateral resolution of 76 nm and threshold sensitivity to variation of the substrate RI of 2.2·10−4 RIU, while similar values for quadrupole LSPR reach 25 nm and 5·10−4 RIU, respectively. The possibility of subsurface RI mapping at a depth up to 50 nm is demonstrated via registration of the dipole spectral shift of the spherical nanoparticle.

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Stress-induced indirect to direct band gap transition in β-FeSi2 nanocrystals embedded in Si

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AIP Conference Proceedings 2017年第1期1874卷

作者： A. V. Shevlyagin D. L. Goroshko E. A. Chusovitin S. A. Balagan S. A. Dotsenko K. N. Galkin N. G. Galkin T. S. Shamirzaev A. K. Gutakovskii M. Iinuma Y. Terai 1Institute of Automation and Control Processes FEB RAS Radio St. 5 Vladivostok Russia 2Far Eastern Federal University School of Natural Sciences Sukhanova St. 8 Vladivostok Russia 3Rzhanov Institute of Semiconductor Physics SB RAS Lavrentieva Ave.13 Novosibirsk Russia 4Ural Federal University Mira St. 19 Yekaterinburg Russia 5Novosibirsk State University Pirogova St. 2 630090 Novosibirsk Russia 6Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka Fukuoka 820-8502 Japan

Embedded in silicon β-FeSi2 nanocrystals (NCs) were grown on Si(111) by solid phase epitaxy of a thin iron film followed by Si molecular beam epitaxy. After solid phase epitaxy, a mixture of β-FeSi2 and ε-FeSi nanocrystals is formed on the surface, sometimes β and ε phases coexist inside one nanocrystal. During initial stage of Si molecular beam epitaxy all ε-FeSi transforms into β-FeSi2. β-FeSi2 nanocrystals tend to move following Si growth front. By adjusting growth condition, we manage to prevent the nanocrystals from moving and to fabricate 7-layer n-Si(111)/β-FeSi2_NCs/p+-Si silicon heterostructure with embedded β-FeSi2 NCs. An epitaxial relationship and a stress induced in the nanocrystals by silicon matrix were found to be suitable for indirect to direct band gap transition in β-FeSi2. Of the heterostructure, a n-i-p avalanche photodetector and a light-emitting diode were formed. They have shown relatively good performance: ultrabroadband photoresponse from the visible (400 nm) to short-wavelength infrared (1800 nm) ranges owing to quantum-confined Stark effect in the nanocrystals and optical emission power of up to 25 µW at 9 A/cm2 with an external quantum efficiency of 0.009% at room temperature owing to a direct fundamental transition in stressed β-FeSi2 nanocrystals.

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Direct femtosecond laser printing of plasmonic colors and functional sensing elements

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AIP Conference Proceedings 2017年第1期1874卷

作者： A. A. Kuchmizhak X. Wang S. Makarov O. Vitrik 1School of Natural Sciences Far Eastern Federal University Vladivostok Russia 2Institute of Automation and Control Processes Far Eastern Branch Russian Academy of Science Vladivostok 690041 Russia 3Swinburne University of Technology John st. Hawthorn 3122 Victoria Australia 4ITMO University St. Peterburg 197101 Russia

Utilization of structural colors produced by nanosized optical antennas is expected to revolutionize the current display technologies based on an ink-jet or pigmentation-based color printing. Meanwhile, the versatile color-mapping strategy combining the fast single-step single-substrate fabrication cycle with low-cost scalable operation is still missing. In this paper we present lithography-free direct approach based on local femtosecond-laser ablative reshaping of the gold film with nJ-energy femtosecond laser pulses allowing plasmon-color printing at typical resolution up to 25000 dots per inch, well enough for current visualization demands. By controlling the only experimental parameter – applied pulse energy - various colors in scattering regime at lateral resolution approaching optical diffraction limit, can be reproduced via mixing various nanostructures having polarization- and shape-dependent localized plasmon-mediated scattering and adjusting their spacing to involve collective plasmon resonances. Possibility to tune the brightness of the isolated pixel is discussed. We believe the presented experimental demonstration will inspire and stimulate new efforts directed toward elaboration of pulsed-laser plasmon-color printing strategy for various applications including low-cost cryptography, security tagging and ultracompact optical data storage.

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High-performance femtosecond laser fabrication of plasmon elements using DOE

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AIP Conference Proceedings 2017年第1期1874卷

作者： P. A. Danilov E. P. Litovko S. I. Kudryashov A. A. Kuchmizhak A. Porfirev O. B. Vitrik S. Ph. Umanskaya 1Lebedev Physical Institute 119991 Moscow Russia 2Moscow Institute of Physics and Technology (National University) 141701 Dolgoprudny Moscow region Russia 3ITMO University St. Peterburg 197101 Russia 5National Research Nuclear University MEPhI (Moscow Engineering Physics Institute) 115409 Moscow Russia 4Institute of Automation and Control Processes Far Eastern Branch Russian Academy of Science Vladivostok 690041 Russia 6Samara National Research University Moskovskoe shosse 34 Samara 443086 Russia

Broadband optically tunable diffractive optical elements (DOEs) were used to generate structured optical beams with considerably increased focal depth. Such beams were justified for high-performance ablative and translative printing of various plasmonic elements via high-efficiency multiplexing of femtosecond Gaussian-shaped laser beams to multiple micro-beams. The increased focal depth of such DOEs and easy-to-implement optical structuring of output beams as well as their high multiplexing efficiency make them very useful devices for high-performance laser fabrication of surface-enhanced infrared absorption sensors.

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The double-resonance enhancement of stimulated low-frequency Raman scattering in silver-capped nanodiamonds

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AIP Conference Proceedings 2017年第1期1874卷

作者： A. N. Baranov A. V. Butsen A. A. Ionin A. K. Ivanova A. A. Kuchmizhak S. I. Kudryashov A. D. Kudryavtseva A. O. Levchenko A. A. Rudenko I. N. Saraeva M. A. Strokov N. V. Tcherniega D. A. Zayarny M.V. Lomonosov Moscow State University Universitetskaya ploschad’ 1 119899 Moscow Russia P.N. Lebedev Physical Institute of the Russian Academy of Sciences Leninsky prospect 53 119991 Moscow Russia National Research Nuclear University MEPhI Moscow Engineering Physics Institute Kashirskoe shosse 31 115409 Moscow Russia Far Eastern Federal University Sukhanova Str. 6 690041 Vladivostok Russia Institute for Automation and Control Processes Far Eastern Branch of Russian Academy of Sciences Radio Str. 5 690041 Vladivostok Russia ITMO University Saint-Petersburg National Research University of Information Technologies Mechanics and Optics Kronverkskiy prospect 49 197101 Saint-Petersburg Russia B. I. Stepanov Physics Institute of the Belarus Academy of Sciences praspiekt Niezaliežnasci 68 220072 Minsk Belarus

Hybrid plasmonic-dielectric nano- and (sub)microparticles exhibit magnetic and electrical dipolar Mie-resonances, which makes them useful as efficient basic elements in surface-enhanced spectroscopy, non-linear light conversion and nanoscale light control. We report the stimulated low-frequency Raman scattering (SLFRS) of a nanosecond ruby laser radiation (central wavelength λ = 694.3 nm (full-width at half-maximum ≈ 0.015 cm−1), gaussian 1/e-intensity pulsewidth τ ≈ 20 ns, TEM00-mode pulse energy Emax ≈ 0.3 J) in nanodiamond (R ≈ 120 nm) hydrosols, induced via optomechanical coherent excitation of fundamental breathing eigen-modes, and the two-fold enhancement of SLFRS in Ag-decorated nanodiamonds, characterized by hybrid dipolar resonances of electrical (silver) and magnetic (diamond) nature. Hybrid metal-dielectric particles were prepared by means of nanosecond IR-laser ablation of solid silver target in diamond hydrosols with consecutive Ag-capping of diamonds, and were characterized by scanning electron microscopy, UV-vis, photoluminescence and energy-dispersive X-ray spectroscopy. Intensities of the SLFR-scattered components and their size-dependent spectral shifts were measured in the highly sensitive stimulated scattering regime, indicating the high (≈ 30%) SLFRS conversion efficiency and the resonant character of the scattering species.

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Photoplethysmographic Waveform as a Function of Subject's Age

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Physics Procedia 2015年 73卷 241-245页

作者： E. Nippolainen N.P. Podolian R.V. Romashko Y.N. Kulchin A.A. Kamshilin University of Eastern Finland 1 Yliopistonranta PL 1627 Kuopio 70211 Finland Institute for Automation and Control Processes of FEB RAS 5 Radio St. Vladivostok 690041 Russia Far Eastern Federal University 8 Sukhanova St. Vladivostok 690900 Russia ITMO University 49 Kronverksky Pr. St. Petersburg 197101 Russia

In this report we present the experimental study of imaging photoplethysmography in the area of the palm and wrist of fifty-six healthy subjects. We found that the amplitude of the PPG waveform is unevenly distributed over the studied area forming the hot spots with the elevated amplitude. There is clear tendency of the amplitude increasing in the hottest spots with the age of the subject. These observations support the recently proposed model of photoplethysmography in which pulse oscillations of the arterial transmural pressure deform the connective-tissue components of the dermis resulting in periodical changes of both the light scattering and absorption.

关键词： photoplethysmography blood pulsation imaging lock-in amplification amplitude distribution of blood pulsation.

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Blistering of film from substrate after action of ultrashort laser pulse

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Journal of Physics: Conference Series 2016年第1期774卷

作者： N A Inogamov V V Zhakhovsky V A Khokhlov A A Kuchmizhak S I Kudryashov Landau Institute for Theoretical Physics of the Russian Academy of Scienses Akademika Semenova 1a Chernogolovka Moscow Region 142432 Russia Dukhov Research Institute of Automatics (VNIIA) Sushchevskaya 22 Moscow 127055 Russia School of Natural Sciences Far Eastern Federal University Sukhanova 8 Vladivostok Primorsky Krai 690041 Russia Institute of Automation and Control Processes of the Far Eastern Branch of the Russian Academy of Sciences Radio 5 Vladivostok Primorsky Krai 690041 Russia ITMO University Kronvergskiy 49 Saint-Petersburg 197101 Russia Lebedev Physical Institute of the Russian Academy of Sciences Leninsky Avenue 53 Moscow 119991 Russia

The goal of the paper is to explain experimental results concerning film blistering. Tightly focused diffraction limited ultrashort optical laser pulse illuminates a small spot at a surface of a thin metal film mounted upon a dielectric or semiconductor support (substrate). Film mechanically separates from substrate and form a cupola like bump in a rather narrow range of absorbed fluences. Below this range deformations inside the spot are negligible. While above the range the hole remains in a film in the irradiated spot. The paper presents physical model starting from absorption and two-temperature state and including, first, description of conductive redistribution of absorbed heat, melting, hydrodynamics of strong three-dimensional deformations of a moving film, and, second, freezing of molten metal.

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