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Nonpolar Al_(x)Ga_(1−x)N/Al_(y)Ga_(1−y)N multiple quantum wells on GaN nanowire for UV emission

Nano Research 2022年第8期15卷 7670-7680页

作者： Sonachand Adhikari Olivier Lee Cheong Lem Felipe Kremer Kaushal Vora Frank Brink mykhaylo lysevych Hark Hoe Tan Chennupati Jagadish Department of Electronic Materials Engineering Research School of PhysicsThe Australian National UniversityCanberraAustralian Capital Territory 2601Australia Semiconductor Device Fabrication Group CSIR-Central Electronics Engineering Research InstitutePilaniRajasthan 333031India Australian National Fabrication Facility ACT Node Research School of PhysicsThe Australian National UniversityCanberraAustralian Capital Territory 2601Australia Centre for Advanced Microscopy The Australian National UniversityCanberraAustralian Capital Territory 2601Australia Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems Research School of PhysicsThe Australian National UniversityCanberraAustralian Capital Territory 2601Australia

Nonpolar m-plane AlGaN offers the advantage of polarization-free multiple quantum wells(MQWs)for ultraviolet(UV)emission and can be achieved on the sidewalls of selective area grown GaN *** reveal that the growth of AlGaN on GaN nanowires by metal organic chemical vapor deposition(MOCVD)is driven by vapor-phase diffusion,and consequently puts a limit on the pitch of nanowire array due to shadowing *** insight into the difficulty of achieving metal-polar AlGaN nanowire by selective area growth(SAG)in MOCVD is also provided and can be attributed to the strong tendency to form pyramidal structure due to a very small growth rate of{1011}semipolar planes compared to(0001)*** nonpolar m-plane sidewalls of GaN nanowires obtained via SAG provides an excellent platform for growth of nonpolar AlGaN *** emission from mplane Al_(x)Ga_(1−x)N/Al_(y)Ga_(1−y)N MQWs grown on sidewalls of dislocation-free GaN nanowire is demonstrated in the wavelength range of 318–343 nm.

关键词： metal organic chemical vapor deposition(MOCVD) nanowire nonpolar plane AlGaN selective area growth multiple quantum wells

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Nonlinear frequency conversion in optical nanoantennas and metasurfaces:materials evolution and fabrication

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Opto-Electronic Advances 2018年第10期1卷 1-12页

作者： Mohsen Rahmani Giuseppe Leo Igal Brener Anatoly V. Zayats Stefan A. Maier Costantino De Angelis Hoe Tan Valerio Flavio Gili Fouad Karouta Rupert Oulton Kaushal Vora mykhaylo lysevych Isabelle Staude Lei Xu Andrey E. Miroshnichenko Chennupati Jagadish Dragomir N. Neshev Research School of Physics and Engineering The Australian National University Canberra ACT 2601 Australia Matériaux et Phénomènes Quantiques Université Paris Diderot-Sorbonne Paris Cité 10 rue A. Domon et L. Duquet 75013 Paris France Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque New Mexico 87185 United States Department of Physics King’s College London Strand London WC2R 2LS United Kingdom The Blackett Laboratory Department of Physics Imperial College London London SW7 2AZ United Kingdom Chair in Hybrid Nanosystems Nano Institute Munich Fakultat für Physik Ludwig-Maximilians-Universitat München München Germany Deptartment of Information Engineering Universitàdegli Studi di Brescia and INO-CNR Via Branze 38 25123 Brescia Italy Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena 07745 Jena Germany School of Engineering and Information Technology University of New South Wales Canberra ACT 2600 Australia

Nonlinear frequency conversion is one of the most fundamental processes in nonlinear *** has a wide range of applications in our daily lives,including novel light sources,sensing,and information *** is usually assumed that nonlinear frequency conversion requires large crystals that gradually accumulate a strong ***,the large size of nonlinear crystals is not compatible with the miniaturisation of modern photonic and optoelectronic ***,shrinking the nonlinear structures down to the nanoscale,while keeping favourable conversion efficiencies,is of great importance for future photonics *** the last decade,researchers have studied the strategies for enhancing the nonlinear efficiencies at the nanoscale,*** employing different nonlinear materials,resonant couplings and hybridization *** this paper,we provide a compact review of the nanomaterials-based efforts,ranging from metal to dielectric and semiconductor nanostructures,including their relevant nanofabrication techniques.

关键词： nonlinear nanophotonics metallic nanoantennas dielectric nanoantennas III-V semiconductor nanoantenna nanofabrication

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Infrared upconversion imaging in nonlinear metasurfaces

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Advanced Photonics 2021年第3期3卷 83-92页

作者： Rocio Camacho-Morales Davide Rocco Lei Xu Valerio Flavio Gili Nikolay Dimitrov Lyubomir Stoyanov Zhonghua Ma Andrei Komar mykhaylo lysevych Fouad Karouta Alexander Dreischuh Hark Hoe Tan Giuseppe Leo Costantino De Angelis Chennupati Jagadish Andrey E.Miroshnichenko Mohsen Rahmani Dragomir N.Neshev The Australian National University Research School of PhysicsARC Centre of Excellence for Transformative Meta-Optical SystemsDepartment of Electronic Materials EngineeringCanberraACTAustralia University of Brescia Department of Information EngineeringBresciaItaly University of New South Wales School of Engineering and Information TechnologyCanberraACTAustralia Nottingham Trent University School of Science and TechnologyAdvanced Optics and Photonics LaboratoryDepartment of EngineeringNottinghamUnited Kingdom UniversitéParis Diderot Matériaux et Phénomènes QuantiquesParisFrance Friedrich Schiller University Jena Institute of Applied PhysicsAbbe Center of PhotonicsJenaGermany Sofia University Department of Quantum ElectronicsFaculty of PhysicsSofiaBulgaria

Infrared imaging is a crucial technique in a multitude of applications,including night vision,autonomous vehicle navigation,optical tomography,and food quality *** infrared imaging technologies,however,require the use of materials such as narrow bandgap semiconductors,which are sensitive to thermal noise and often require cryogenic *** demonstrate a compact all-optical alternative to perform infrared imaging in a metasurface composed of GaAs semiconductor nanoantennas,using a nonlinear wave-mixing *** experimentally show the upconversion of short-wave infrared wavelengths via the coherent parametric process of sum-frequency *** this process,an infrared image of a target is mixed inside the metasurface with a strong pump beam,translating the image from the infrared to the visible in a nanoscale ultrathin imaging *** results open up new opportunities for the development of compact infrared imaging devices with applications in infrared vision and life sciences.

关键词： metasurfaces nonlinear optical processes infrared photonics imaging.

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CoⅡ single-ion magnet and its multi-dimensional aggregations:Influence of the structural rigidity on magnetic relaxation process

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Chinese Chemical Letters 2025年第2期 546-550页

作者： Zhao-Bo Hu Ling-Ao Gui Long-He Li Tong-Tong Xiao Adam T.Hand Pagnareach Tin mykhaylo Ozerov Yan Peng Zhongwen Ouyang Zhenxing Wang Zi-Ling Xue You Song Chaotic Matter Science Research Center Faculty of Materials Metallurgy and ChemistryJiangxi University of Science and Technology State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical EngineeringNanjing University Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry Jiangxi University of Science and Technology Wuhan National High Magnetic Field Center&School of Physics Huazhong University of Science and Technology Department of Chemistry University of Tennessee National High Magnetic Field Laboratory Florida State University

Two CoⅡ-based complexes, {[Co（dps）2（N3）2]·H2O}_n （1） and [Co（dps）2（N3）2]_n （2）, show a 1D chain and a 3D network, respectively. The central CoⅡ ions in the complexes have the same coordination environment with the [Co（dps）4（N3）2] unit. Although the differences in crystal parameters are nearly negligible, their magnetic properties are very different. AC susceptibility data show that 1 behaves as a typical field-induced single-ion magnet（SIM） with the out-of-phase（χM”） signals, while 2 shows ac signals ofχM” without peaks even under applied dc filed within our measurement window. Far-IR magneto-spectra（FIRMS） show strong spin-phonon couplings at 0 T in 2, likely making the magnetic relaxation in 2 fast,while the couplings are negligible in 1. Small spin-phonon coupling in 1 likely leads to slower magnetic relaxation, making 1 a SIM. The difference in the properties is due to the structural rigidity of 2 in its 3D network, leading to stronger spin-phonon coupling. Combined high-field EPR（HF-EPR） and FIRMS studies give spin-Hamiltonian parameters, including D = 64.0（9） cm-1, |E| = 15.7（2） cm-1for 1 and D = 80.0（2）cm-1, |E| = 19.0（1） cm-1for 2.

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The use of metal hydrides in fuel cell applications

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Progress in Natural Science:Materials International 2017年第1期27卷 3-20页

作者： mykhaylo V.Lototskyy Ivan Tolj Lydia Pickering Cordellia Sita Frano Barbir Volodymyr Yartys HySA Systems Competence Centre South African Institute for Advanced Materials Chemistry (SAIAMC) University of the Western Cape University of Split Faculty of Electrical Engineering Mechanical Engineering and Naval Architecture Department of Thermodynamics and Heat Engines Institute for Energy Technology Kjeller

This paper reviews state-of-the-art developments in hydrogen energy systems which integrate fuel cells with metal hydride-based hydrogen storage. The 187 reference papers included in this review provide an overview of all major publications in the field, as well as recent work by several of the authors of the review. The review contains four parts. The first part gives an overview of the existing types of fuel cells and outlines the potential of using metal hydride stores as a source of hydrogen fuel. The second part of the review considers the suitability and optimisation of different metal hydrides based on their energy efficient thermal integration with fuel *** performances of metal hydrides are considered from the viewpoint of the reversible heat driven interaction of the metal hydrides with gaseous H;. Efficiencies of hydrogen and heat exchange in hydrogen stores to control H;charge/discharge flow rates are the focus of the third section of the review and are considered together with metal hydride – fuel cell system integration issues and the corresponding engineering solutions. Finally, the last section of the review describes specific hydrogen-fuelled systems presented in the available reference data.

关键词： Fuel cells Hydrogen storage Metal hydrides Thermal integration System development

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Asymptotic Solution to Scattering Problem on a Set of Small Particles and Application to Creating the Materials with a Peculiar Refractive Index

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Journal of Applied Mathematics and Physics 2020年第3期8卷 375-391页

作者： mykhaylo I. Andriychuk Department of Numerical Methods of Mathematical Physics Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU Lviv Ukraine

The asymptotic solution to the scattering problem on a set of small particles, supplemented into homogeneous material, is used for modeling the materials with the desired refractive index. The consideration concerns the case of acoustic scalar scattering and the solution to initial scattering problem is built using an asymptotic approach. The closed form solution is reduced for the scattering problem. This is significant advantage of approach because there is no need to solve the respective system of boundary integral equations. High accuracy of solving the scattering problem is achieved by choosing the optimal parameters of the domain with small particles. The approach allows obtaining an explicit formula for the refractive index of the resulting inhomogeneous material. The numerical calculations show the possibility to get the specific values of refractive index including its negative values.

关键词： Set of Small Particles Scattering Problem Asymptotic Solution Peculiar Refractive Index Computational Modeling

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Modeling the Physical Parameters of Solenoids for MEMS Applications

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Journal of Applied Mathematics and Physics 2024年第5期12卷 1819-1834页

作者： mykhaylo Andriychuk Bohdan Karkulovskyi Yarko Kuleshnyk Department of Computer Design System Lviv Polytechnic National University Lviv Ukraine Department of Numerical Methods of Mathematical Physics Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU Lviv Ukraine

The paper is devoted to study of the electrical parameters of the motion parts of the MEMS such as solenoids. The analytical background is given in order to describe the influence of the electrical field components on the forces, which are result of interaction of the electromagnetic (EM) field components with the parts of motion devices of MEMS. The given analytical formulas open the ability to calculate the self-inductance of the microsolenoids of the different kind, as well as the stored energy of such motion devices, that could be used for the modeling and optimization of parameters of running devices of MEMS such as actuators, sensors etc.

关键词： EM Description Motion Microdevice Microsolenoid Stored Energy Computational Data

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Non-Linear Synthesis Problems for Plane Radiating Systems According to the Prescribed Power Directivity Pattern

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Open Journal of Antennas and Propagation 2013年第2期1卷 23-34页

作者： mykhaylo Andriychuk Petro Savenko Myroslava Tkach Pidstryhach Institute for Applied Problems in Mechanics and Mathematics NASU Lviv Ukraine

A variational formulation of the synthesis problem for plane radiating systems according to the prescribed power directivity pattern (DP) is considered. The function representing the mean-square deviation of the prescribed and synthesized power DPs and containing the additional term with squared norm of the current or field in the antenna aperture is considered as the criterion of optimization. Freedom to choose the phase DP is used to improve the proximity of the prescribed and synthesized DPs. In such formulation, the classes of non-linear problems, for which the non-uniqueness of solutions, their branching and bifurcation are characteristic, arise. The properties of solutions depend on the electric size of radiating system and prescribed power DP. From a practical point of view, the existence of different solutions creating the same or similar DPs, gives the opportunity to choose the solution that has a simpler implementation. The synthesis problems for plane radiating systems and plane arrays are considered.

关键词： Power Radiation Pattern Synthesis Problem Non-Linear Equation Bifurcation of Solutions Numerical Modeling

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Poriferan chitin as a template for hydrothermal zirconia deposition

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Frontiers of Materials Science 2013年第3期7卷 248-260页

作者： Marcin WYSOKOWSKI mykhaylo MOTYLENKO Vasilii V. BAZHENOV Dawid STAWSKI lroslav PETRENKO Andre EHRLICH Thomas BEHM Zoran KLJAJIC Allison L. STELLING Teofil JESIONOWSKI Hermann EHRLICH Institute of Chemical Technology and Engineering Poznan University of Technology 60965 Poznan Poland Institute of Materials Science TU Bergakademie Freiberg D-09599 Freiberg Germany Institute of Experimental Physics TU Bergakademie Freiberg 09599 Freiberg Germany Department of Commodity and Material Sciences and Textile Metrology Technical University of Lodz 90924 Lodz Poland Institut fur Eisenund Stahltechnologie TU Bergakademie Freiberg 09599 Freiberg Germany Institute of Mineralogy TU Bergakademie Freiberg 09599 Freiberg Germany Institute of Marine Biology University of Montenegro 85330 Kotor Montenegro Department of Mechanical Engineering and Materials Science Duke University 27708 Durham NC USA

Chitin is a thermostable biopolymer found in various inorganic-organic skeletal structures of numerous invertebrates including sponges （Porifera）. The occurrence of chitin within calcium- and silica-based biominerals in organisms living in extreme natural conditions has inspired development of new （extreme biomimetic） synthesis route of chitin-based hybrid materials in vitro. Here, we show for the first time that 3D-a-chitin scaffolds isolated from skeletons of the marine sponge Aplysina aerophoba can be effectively mineralized under hydrothermal conditions （150℃） using ammonium zirconium（IV） carbonate as a precursor of zirconia. Obtained chitin-ZrO2 hybrid materials were characterized by FT-IR, SEM, HRTEM, as well as light and confocal laser microscopy. We suggest that formation of chitin-ZrO2 hybrids occurs due to hydrogen bonds between chitin and ZrO2.

关键词： chitin biocomposite zirconia hydrothermal synthesis ammonium zirco-nium carbonate

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Modeling of Plane Arrays Using a Variational Approach

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Open Journal of Antennas and Propagation 2018年第4期6卷 93-105页

作者： mykhaylo I. Andriychuk Yarema F. Kuleshnyk Department of Numerical Methods of Mathematical Physics Pidstryhach Institute for Applied Problems of Mechanics and Mathematics NASU Lviv Ukraine Department of Informatics Lviv State University of Internal Affairs Lviv Ukraine

The variational statement of synthesis problem is generalized in order to account the additional requirements to the synthesized radiation pattern (RP) and field distribution in the specified points of near zone. For this aim, the minimizing functional is supplemented by term providing the possibility to minimize the values of field in these points;creating the deep zeros in the RP for the certain angular coordinates is realized too. The approach foresees reduction of an explicit formula for field values in a near zone. The results of computational modeling testify the possibility to create zeros in the given RP and to minimize the values of field in a near zone of plane arrays in a great extent.

关键词： Synthesis Problem Variational Statement Plane Array Near Zone Euler’s Equation Numerical Modeling

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