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作者： Kulchin, Yu. N. Vitrik, O.B. Dyshlyuk, A.V. Shalagin, A.M. Babin, S.A. Nemov, I.N. Institute of Automation and Control Processes FEB RAS ul. Radio 5 Vladivostok 690041 Russia Institute of Automation and Electrometry SB RAS ul. Akademika Koptyuga 1 Novosibirsk 630090 Russia

The paper presents a reflectometric technique for interrogation of multiple fiber Bragg grating (FBG) sensors based on conventional optical time domain reflectometry (OTDR). The method proposed rests on the differential measurement of FBGs' response to a short probing laser pulse. Implementation of differential measurement principle using several reference FBGs allowed us to eliminate the susceptibility of the system to intensity fluctuations as well as to increase the measurement range as compared to the previous developments. The experimental threshold sensitivity amounted to ∼50 microstrain with the measurement range being defined by the number of reference FBGs and limited only by optical fiber tensile strength. Due to its simplicity, efficiency and usage of conventional OTDR equipment the proposed FBG interrogation technique can find a wide range of applications dealing with strain and temperature measurements. © 2011 Pleiades Publishing, Ltd.

关键词： Fiber Bragg gratings

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Crystallization of optically thick amorphous silicon films by near-ir femtosecond laser processing 5th

Crystallization of optically thick amorphous silicon films b...

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5th Asian School-Conference on Physics and Technology of Nanostructured Materials, ASCO-Nanomat 2020

作者： Mitsai, Eugeny Dostovalov, Alexander Bronnikov, Kirill Nepomniaschiy, Alexander Zhizhchenko, Alexey Kuchmizhak, Aleksandr Institute of Automation and Control Processes FEB RAS 5 Radio St Vladivostok690041 Russia Institute of Chemistry FEB RAS 159 Pr-t. 100-letiya Vladivostoka Vladivostok690022 Russia Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave Novosibirsk630090 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia

ISBN: (纸本)9783035737936

We demonstrated efficient crystallization of amorphous Si films induced by their direct irradiation with near-IR femtosecond laser pulses coming at sub-MHz repetition rate. Comprehensive analysis of morphology and composition of the laser-annealed film by atomic-force microscopy, Fourier-transform IR, Raman and energy dispersive X-ray spectroscopy as well as numerical modeling of optical spectra confirmed efficient crystallization of amorphous Si and high-quality of the obtained films opening pathway for applications in thin-film solar cells, transistors and displays. © 2020 Trans Tech Publications Ltd, Switzerland.

关键词： Amorphous silicon

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Calculation of Resonant Frequencies of Silicon AFM Cantilevers 8

Calculation of Resonant Frequencies of Silicon AFM Cantileve...

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8th International Youth Scientific School-Conference on Modern Problems of Physics and Technology, MPPT 2019

作者： Efimov, T.A. rassolov, E.A. Andryukov, B.G. Zaporozhets, T.S. Romashko, R.V. Optoelectronics Department Institute of Automation and Control Processes Feb Ras Radio street 5 Vladivostok690041 Russia Far-Eastern Federal University Sukhanova street 8 Vladivostok690950 Russia G.P. Somov Research Institute of Epidemiology and Microbiology Feb Ras Selskya street 1 Vladivostok690087 Russia

A theoretical study of the quality and the validity range of different numerical and analytical methods of calculating of the frequency shift in measurement using microcromechanical sensor is presented. This work considered a calculating method for natural frequency in comparison with experimentally measured oscillation frequencies of microcromechanical sensor immersed in air and/or viscous medium. The numerical methods for solving the equation of resonance oscillation of the console fixed on one side are considered for calculating the natural oscillation frequencies of standard AFM cantilevers. © Published under licence by IOP Publishing Ltd.

关键词： Natural frequencies

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Formation of thermochemical laser-induced periodic structures on titanium films in a nitrogen-rich atmosphere 5

Formation of thermochemical laser-induced periodic structure...

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Advanced Laser Processing and Manufacturing V 2021

作者： Bronnikov, Kirill Dostovalov, Alexander Okotrub, Konstantin Kuchmizhak, Aleksandr Korolkov, Victor Babin, Sergey Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave. Novosibirsk630090 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia Institute of Automation and Control Processes of the FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University Vladivostok690041 Russia

ISBN: (数字)9781510646346

ISBN: (纸本)9781510646339

Recently, highly regular thermochemical laser-induced periodic surface structures (TLIPSS) have become the subject of active studies. TLIPSS are formed in the interference maxima due to the local oxidation of the material irradiated with ultrashort laser pulses and are characterized by the elevation of the relief that forms parallel oxide protrusions. The gas surrounding is expected to affect the morphology and chemical composition of the resulting TLIPSS;however, such effects were rarely studied so far. Here we present the results of the TLIPSS fabrication on glass-supported Si-Ti bilayer films using an astigmatic Gaussian IR femtosecond beam both in air and a nitrogen-rich atmosphere. The formation of ordered TLIPSS with the period of ≈ 920 nm is observed at slow scanning speeds (∼1 μm/s) and low fluences in a nitrogen-rich atmosphere. Raman spectroscopy revealed the presence of TiO2 (rutile) peaks, as well as bands centered at 280 cm-1 and 320 cm-1, which can be related to TiN in amorphous and polycrystalline phase. © 2021 SPIE.

关键词： Nitrogen

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Unveiling the stacking-dependent electronic properties of the 2D ultrathin rare-earth metalloxenes family LnX2 (Ln = Eu, Gd, Dy;X = Ge, Si)

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Journal of Materials Chemistry C 2024年第16期12卷 5926-5933页

作者： Mihalyuk, Alexey N. Sheverdyaeva, Polina M. Chou, Jyh-Pin Matetskiy, Andrey V. Eremeev, Sergey V. Zotov, Andrey V. Saranin, Alexander A. Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690950 Russia Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia Strada Statale 14 km 163.5 Trieste34149 Italy Department of Physics National Changhua University of Education No. 1 Jinde Rd. Changhua County Changhua City50007 Taiwan Institute of Strength Physics and Materials Science Tomsk634055 Russia

Studies of electronic effects in reduced dimensionality have become a frontier in nanoscience due to the exotic and highly tunable character of quantum phenomena. Recently, a new class of 2D ultrathin LnX2 metalloxenes composed of a triangular lattice of lanthanide ions (Ln) coupled with 2D-Xenes of silicene or germanene (X2) was introduced and studied with a particular focus on magnetic and transport properties. However, the electronic properties of metalloxenes and their effective functionalization remain mainly unexplored. Here, using a number of experimental and theoretical techniques, we trace the evolution of the electronic properties and magnetic ground state of metalloxenes triggered by external perturbations. We demonstrate that the band structure of LnX2 films can be uniquely modified by controlling the Xenes stacking, thickness, varying the rare-earth and host elements, and applying an external electric field. Our findings suggest new pathways to manipulate the electronic properties of 2D rare-earth magnets that can be adjusted for spintronics applications. © 2024 The Royal Society of Chemistry

关键词： Electronic properties

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Laser-induced periodic structures-assisted surface plasmon resonance refractive index sensor 8

Laser-induced periodic structures-assisted surface plasmon r...

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Plasmonics VIII 2024

作者： Bronnikov, Kirill Munkueva, Zhibzema Terentiev, Vadim Simonov, Victor Mikerin, Sergey Babin, Sergey A. Kuchmizhak, Aleksandr Dostovalov, Alexander Institute of Automation and Electrometry of the SB RAS 1 Acad. Koptyug Ave. Novosibirsk630090 Russia School of Physics and Engineering ITMO University St. Petersburg191002 Russia Novosibirsk State University 2 Pirogova St. Novosibirsk630090 Russia Institute of Automation and Control Processes of the FEB RAS 5 Radio St. Vladivostok690041 Russia Far Eastern Federal University Vladivostok690041 Russia

ISBN: (纸本)9781510682184

Laser-induced periodic surface structures (LIPSS) offer a simple, single-step technique for creating periodic patterns on solids in an ambient air. Combined with metals like gold or silver, LIPSS enhances grating-assisted refractive index (RI) sensors using surface plasmon resonance (SPR). This study analyzes an SPR sensor in the Kretschmann configuration with a periodically modulated silver layer. The modulation is created by LIPSS formed on a titanium-coated glass prism using femtosecond laser pulses, followed by a silver coating. Reflection spectra for wavelengths λ = 600-1700 nm were calculated for various angles of incidence and RI values (1.33-1.4). Unlike a flat sensor with a single resonance, the LIPSS-based sensor shows multiple resonances (λ = 1000-1700 nm) due to modes on inner and outer interfaces. LIPSS reduces resonance spectral width by an order of magnitude, but also reduces sensitivity similarly, weakly affecting the Figure of Merit. The LIPSS-assisted sensor was also tested experimentally. © 2024 SPIE.

关键词： Femtosecond lasers

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Surface Phases of Metals on Silicon as Material for Surface Engineering

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MRS Online Proceedings Library (OPL) 2011年第1期697卷 P5.28-P5.28页

作者： Alexander A. Saranin Sergey V. Rizhkov Dmitriy A. Tsukanov Victor G. Lifshits Andrey V. Zotov Kenjiro Oura Shuji Hasegawa Institute of Automation and Control Processes FEB RAS Vladivostok Russia Vladivostok State University Vladivostok Russia Department of Electronic Engineering Osaka University Suita Osaka 565 Japan Department of Physics University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan

To study structural and transport properties of the surface phases on silicon, a number of adsorbate/silicon systems on Si(100) and Si(111) surfaces has been investigated using scanning tunneling microscopy (STM), reflection-high-energy-electron diffraction (RHEED) and in-situ electrical resistance measurements. Results of investigations of formation and electrical properties of Si-Al, Si-Na, Si-Ag and Si-In surface structure are presented.

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One-dimensional rashba states in Pb atomic chains on a semiconductor surface

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Physical Review B 2020年第3期102卷 035442-035442页

作者： A. N. Mihalyuk J. P. Chou S. V. Eremeev A. V. Zotov A. A. Saranin Institute of Automation and Control Processes FEB RAS 690041 Vladivostok Russia School of Natural Sciences Far Eastern Federal University 690950 Vladivostok Russia Department of Physics National Changhua University of Education No. 1 Jinde Road Changhua City Changhua County 50007 Taiwan Institute of Strength Physics and Materials Science Tomsk 634055 Russia

We investigate the electronic and spin structure of Pb atomic chains on a Si(100)−215;1 surface using first-principles calculations. We revealed that the electronic spectra of linear dimerized Pb chains with orient... 详细信息

We investigate the electronic and spin structure of Pb atomic chains on a Si(100)−2×1 surface using first-principles calculations. We revealed that the electronic spectra of linear dimerized Pb chains with orientations perpendicular and parallel to the Si dimers are characterized by one-dimensional large rashba spin splitting providing exclusive spin polarization of the carriers that makes these systems suitable for studying the spin-transport phenomena and realizing a tunable spin current. A buckled dimerized Pb chain with a parallel orientation was predicted to be an insulating rashba system with a vortical spin texture and asymmetric charge distribution. In this paper we trace the origin of rashba band anisotropy and its interplay with chain geometry. The rashba parameters of the considered chains are compared with other well-known systems.

关键词： Electronic structure of atoms & molecules First-principles calculations rashba coupling Spin-orbit coupling 1-dimensional systems Nanowires Band structure methods Density functional theory

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Pushing an Altermagnet to the Ultimate 2D Limit: Symmetry Breaking in Monolayers of GdAlSi

arXiv

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arXiv 2024年

作者： Parfenov, Oleg E. Averyanov, Dmitry V. Sokolov, Ivan S. Mihalyuk, Alexey N. Kondratev, Oleg A. Taldenkov, Alexander N. Tokmachev, Andrey M. Storchak, Vyacheslav G. National Research Center "Kurchatov Institute" Kurchatov Sq. 1 Moscow123182 Russia Institute of High Technologies and Advanced Materials Far Eastern Federal University Vladivostok690950 Russia Institute of Automation and Control Processes FEB RAS Vladivostok690041 Russia

Altermagnets have emerged as a class of materials combining certain ferromagnetic properties with vanishing net magnetization. This combination is highly promising for spintronics, especially if a material can be brought to a nanoscale size. However, experimental studies of the 2D limit of altermagnets and evolution of their properties with thickness are lacking. Here, we study epitaxial films on silicon of the Weyl altermagnet GdAlSi ranging from more than a hundred unit cells to a single unit cell. The films are synthesized by molecular beam epitaxy and, expectedly, do not show any discernible net magnetic moments. Electron transport studies reveal a remarkable transformation of the electron state with the film thickness. Thick films exhibit negative longitudinal magnetoresistance associated with the chiral anomaly but do not demonstrate altermagnetic properties in electron transport due to symmetry restrictions. In ultrathin films, a spontaneous anomalous Hall effect manifests itself, indicating a non-relativistic spin splitting in the electronic structure. The transformation is associated with crystal symmetry breaking accompanying the 3D-to-2D crossover. The work highlights the role of dimensionality in altermagnetism and provides a platform for studies of altermagnets aiming at ultra-compact spintronics. © 2024, CC BY.

关键词： Molecular beam epitaxy

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Monolayer Magnetic Metal with Scalable Conductivity

arXiv

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arXiv 2024年

2D magnets have emerged as a class of materials highly promising for studies of quantum phenomena and applications in ultra-compact spintronics. Current research aims at design of 2D magnets with particular functional properties. A formidable challenge is to produce metallic monolayers: the material landscape of layered magnetic systems is strongly dominated by insulators;rare metallic magnets, such as Fe3GeTe2, become insulating as they approach the monolayer limit. Here, electron transport measurements demonstrate that the recently discovered 2D magnet GdAlSi – graphene-like AlSi layers coupled to layers of Gd atoms – remains metallic down to a single monolayer. Band structure analysis indicates the material to be an electride, which may stabilize the metallic state. Remarkably, the sheet conductance of 2D GdAlSi is proportional to the number of monolayers – a manifestation of scalable conductivity. The GdAlSi layers are epitaxially integrated with silicon, facilitating applications in electronics. © 2024, CC BY.

关键词： Monolayers

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