Article
Physics, Applied
J. T. S. Dantas, R. M. Souza, A. S. Carrico, S. M. S. B. Martins Jr, L. L. Oliveira, Ana L. Dantas
Summary: We report a theoretical study on the magnetic profiles of vortex pairs in dipolar coupling thin Ni80Fe20 elliptical nanocylinders. It is shown that the external magnetic field route can control the magnetic phases at remanence and adjust the formation and orientation of vortices by manipulating the magnetic field path.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Bar Cohn, Kamalika Das, Arghyadeep Basu, Lev Chuntonov
Summary: The study demonstrated a significant reduction in the bandwidth of lattice resonances in large-area arrays of half-wavelength mid-infrared antennas, achieving resonance quality factors above 200. By tuning the wavelength of the antenna-lattice resonances to match the transition frequency of molecular vibrational modes, a strong coupling between ALR and carbonyl stretching excitation in a thin film of (poly)methyl methacrylate (PMMA) polymer was achieved, paving the way for exciting research on the many-body correlated dynamics of vibrational polaritons.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Jialong Yu, Weiyu Wang, Shumin Li, Beibei Yu, Hongyu Chen, Yawen Wang
Summary: A seedless method has been developed to synthesize seaweed-like Au nanowires on a Au substrate using amino silane coupling agent. The growth mechanism and controlling parameters were investigated, and the compatibility of this synthesis with a colloidal Au substrate was demonstrated.
CHEMICAL COMMUNICATIONS
(2022)
Article
Optics
Asaf Farhi, Aristide Dogariu
Summary: The interaction between helical structures and oscillating dipoles can lead to strong and selective responses. The identification of coherent oscillation modes through vibrational and eigenfunction analyses may explain the diverse functionality of cytoskeletal microtubules in the cellular environment.
Article
Physics, Multidisciplinary
Maximilian Patzauer, Katharina Krischer
Summary: In the study of oscillatory photoelectrodissolution of n-type Si in a fluoride-containing electrolyte under anodic potentials, researchers observed the emergence of multifrequency clusters. These clusters are believed to be the result of adaptive, nonlinear, and nonlocal coupling, similar to dynamics found in neural systems.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Filipe B. Magalhaes, Ruth F. V. V. Jaimes, Paola Corio, Walter J. Salcedo
Summary: By manufacturing Au nanocylinder arrays with a monolayer of nicotinamide adenine dinucleotide (NAD), intense and fluctuating Raman lines were observed in surface-enhanced Raman scattering (SERS) measurements, suggesting a dynamic back-action parametric interaction between plasmon mode and vibrational modes. The study indicates that the highly efficient SERS structure promotes the formation and destruction of protuberances smaller than 2 nm on the nanocylinder surface.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Engineering, Electrical & Electronic
Yaniv Kerzhner, Ariel Epstein
Summary: We propose an analytical scheme for designing metagrating-enhanced sparse antenna arrays, which does not involve time-consuming optimizations or complex manipulations. Instead, it utilizes a passive metagrating superstrate and a semianalytical procedure to ensure suppression of grating lobes. By extending previous formulations, we establish analytical relations connecting the passive and active elements, enabling the resolution of detailed device configurations for optimal directivity. The developed scheme offers a novel method for mitigating grating lobes in sparse arrays with scanning capabilities.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Physics, Multidisciplinary
Maximilian Patzauer, Katharina Krischer
Summary: The study investigates the oscillatory photoelectrodissolution of n-type Si in a fluoride-containing electrolyte under anodic potentials. By lowering the illumination intensity stepwise, different oscillation patterns such as modulated amplitude clusters and multifrequency clusters were observed, indicating adaptive, nonlinear, and nonlocal coupling mechanisms similar to those in neural dynamics.
PHYSICAL REVIEW LETTERS
(2021)
Article
Optics
Andra Naresh Kumar Reddy, Simon Mahler, Alon Goldring, Vishwa Pal, Asher A. Friesem, Nir Davidson
Summary: The paper presents a unique approach for steady in-phase locking of lasers in an array, regardless of the array geometry, position, orientation, period, or size. It achieves steady in-phase locking of 90 lasers with sharp spots and high power density in their far-field patterns. The internal phase structures of the lasers can be suppressed to achieve pure Gaussian mode laser outputs. This phase locking method is useful for applications and research fields requiring high power density in focused laser beams.
Review
Astronomy & Astrophysics
Yiqun Yu, Jinbin Cao, Zuyin Pu, Vania K. Jordanova, Aaron Ridley
Summary: This article reviews recent advances in understanding three major meso-scale coupling processes within the fully integrated magnetosphere-ionosphere system, including transient field-aligned currents (FACs), mid-latitude plasma convection, and auroral particle precipitation. The challenges in global modeling of the circulation system are also discussed.
SPACE SCIENCE REVIEWS
(2022)
Article
Engineering, Electrical & Electronic
Riccardo Ozzola, Daniele Cavallo, Andrea Neto
Summary: This study investigates beam coupling in radiating structures that support multiple simultaneous beams. It is found that orthogonal beams can still be achieved even with a high level of mutual coupling between individual array elements, as long as the total current distributions associated with the beams are uncoupled.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Materials Science, Multidisciplinary
Mingming Yang, Binghui Yin, Zhisheng Li, Xiaoyan Zeng, Ming Yan
Summary: The report discusses an analogous optical activity phenomenon in cylindrical nanowires where spin waves exhibit a continuous rotation in azimuthal distribution. This circular birefringence is attributed to the overall curvilinear shape of the waveguide, and the rotatory power of the nanowires can be altered by an external field, reminiscent of the Faraday magneto-optical effect.
Article
Materials Science, Multidisciplinary
Thomas B. Clarke, Guillermo S. Colon, Jeffrey E. Dick
Summary: Gold has exciting properties and can be used in various applications. Although gold nanoparticles are commonly used, nanorings provide a new and interesting geometry. However, the fabrication of nanorings is challenging, particularly in creating nanoring arrays. This study demonstrates a simple method using electrodeposition to create arrays of gold nanorings with adjustable parameters.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Automation & Control Systems
Guangtong Ma, Yiyu Wang, Jun Luo, Yao Cai, Ruichen Wang, Xuliang Song
Summary: This article proposes a novel analytical-experiment coupling method for characterizing the electromagnetic forces of a superconducting electrodynamic suspension system. The method predicts the induced currents of the ground null-flux coils through analytical calculation and directly measures the electromagnetic forces on the onboard superconducting magnets. The accuracy of the induced current calculation is ensured through a Neumann's formula-based analytical model, which is validated by comparing with finite-element simulation. The proposed method is advantageous as it is not limited by high speed rotating motion and an experimental setup validates its effectiveness.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Hyunwoo Kim, Seunghyun Moon, Jongwoo Kim, Sang Hwan Nam, Dong Hwan Kim, Jeong Seop Lee, Kyoung-Ho Kim, Evan S. H. Kang, Kwang Jun Ahn, Taewan Kim, ChaeHo Shin, Yung Doug Suh
Summary: The study investigated photoluminescence enhancement from few-layer MoS2 transferred on Au nanostructure arrays with controlled localized surface plasmon resonance (LSPR) spectral positions. Two distinctive regimes in LSPR mode-dependent PL enhancement were revealed, with a maximum enhancement of around 40-fold at zero detuning and a modest enhancement of around 10-fold with red-shift detuned LSPR, attributed to LSPR-induced optical field enhancement and the Purcell effect, respectively.
Article
Chemistry, Physical
Iqra Irfan, Sergii Golovynskyi, Matteo Bosi, Luca Seravalli, Oleg A. Yeshchenko, Bin Xue, Dan Dong, Yan Lin, Ran Qiu, Baikui Li, Junle Qu
Summary: The size and shape of metal nanoparticles affect the plasmonic enhancement of MoS2, with silver nanotriangles providing stronger enhancement compared to silver nanospheres. Additionally, covering with silver nanotriangles can generate hot spots and induce strong plasmonic coupling between neighboring nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Oleg A. Yeshchenko, Pavlo S. Khort, Nataliya V. Kutsevol, Vadym M. Prokopets, Olga Kapush, Volodymyr Dzhagan
Summary: The study focused on temperature-driven plasmon-exciton coupling in a hybrid nanosystem. Significant peak splitting in the absorption spectrum indicated the formation of plexcitons, while plasmonic enhancement of CdTe QDs' photoluminescence was observed over time. The reversible alteration of QD photoluminescence during heating-cooling cycles was attributed to nonradiative resonance energy transfer.
Article
Chemistry, Multidisciplinary
Oleg A. Yeshchenko, Nataliya Kutsevol, Anastasiya Tomchuk, Pavlo S. Khort, Pavlo A. Virych, Vasyl A. Chumachenko, Yulia Kuziv, Antonina P. Naumenko, Andrey Marinin
Summary: A triple hybrid nanosystem of zinc tetraphenylporphyrin photosensitizer/dextran graft polyacrylamide anionic copolymer/Au nanoparticles was synthesized in water-based solution for potential photodynamic therapy applications. The system showed stability against aggregation and sedimentation for several days, with a non-monotonic dependence of ZnTPP fluorescence intensity on the gold concentration. The nanosystem exhibited enhanced singlet oxygen generation under excitation resonant with the localized surface plasmon resonance of the Au NPs, showing promising potential for photodynamic therapy against bacterial contamination.
Article
Nanoscience & Nanotechnology
Tristan C. Paul, Guy M. Hagen, Anatoliy O. Pinchuk, Kelly L. McNear
Summary: Creating sensitive and reproducible SERS substrates is a challenge. This study found that using a 405 nm laser to deposit lines of silver nanoparticles from a silver nitrate and sodium citrate solution yielded the best enhancement and consistency.
Article
Nanoscience & Nanotechnology
Iqra Irfan, Sergii Golovynskyi, Oleg A. Yeshchenko, Matteo Bosi, Ting Zhou, Bin Xue, Baikui Li, Junle Qu, Luca Seravalli
Summary: This study investigates the enhancement of photoluminescence and Raman spectra in 2D MoS2 by decorating it with Au nanorods and nanospheres. The samples decorated with Au nanorods show the highest enhancement, which can be attributed to highly localized plasmonic hot spots.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Oleg A. Yeshchenko, Nataliya Kutsevol, Anastasiya Tomchuk, Pavlo S. Khort, Pavlo A. Virych, Vasyl A. Chumachenko, Yulia Kuziv, Andrey Marinin, Lili Cheng, Guochao Nie
Summary: The thermoresponsive ZnTPP/D-g-PNIPAM/AuNPs triple hybrid nanosystem was synthesized for thermally driven and controlled photodynamic therapy applications. The nanosystem demonstrated excellent stability and plasmonic enhancement of electronic processes in the photosensitizer molecules. In vitro experiments on Staphylococcus aureus proved the high potential of the nanosystem for rapid photodynamic inactivation of microorganisms in wounds or ulcers.
Article
Materials Science, Multidisciplinary
Oleg A. Yeshchenko, Anastasiya Tomchuk, Viktor V. Kozachenko, Randal J. Knize, Michael Haftel, Anatoliy O. Pinchuk
Summary: This study presents the tunable optical extinction spectra of gold nanoparticles on a glass substrate near a thin aluminum film. Experimental and numerical results show that the angle and polarization of incident light affect the width and wavelength of the spectral peaks.
Article
Physics, Condensed Matter
Anatoliy V. Goncharenko, Eugene F. Venger, Anatoliy O. Pinchuk
Summary: The traditional mixing rules are not applicable to shape-distributed composites, and therefore, we propose two analytical models for the effective conductivity of these composites. One model shows reasonable agreement with experimental data, while the other model exhibits a logarithmic singularity at the percolation threshold.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Biotechnology & Applied Microbiology
Anton Tkachenko, Pavlo Virych, Valeriy Myasoyedov, Volodymyr Prokopiuk, Anatolii Onishchenko, Dmytro Butov, Yuliia Kuziv, Oleg Yeshchenko, Sican Zhong, Guochao Nie, Nataliya Kutsevol
Summary: The aim of this study was to evaluate the cytotoxicity of gold and silver nanoparticles synthesized into dextran-graft-polyacrylamide polymer nanocarrier. The results showed that the Ag/D-PAA composite had higher cytotoxicity against erythrocytes compared to fibroblasts. Eryptosis was found to be a more sensitive tool for assessing the biocompatibility of nanomaterials.
BIOMED RESEARCH INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Leonidas E. Ocola, James Bucchignano, Simon Dawes, Andrei Fustochenko
Summary: This paper proposes an alternative method for fabricating T- and gamma-gates used for special geometry compound semiconductor high electron mobility transistors. The method utilizes a triple resist stack, a single ternary developer, and a proximity effect correction image superposition approach. It allows for critical dimension control and accurate proximity effect correction for complex structures.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2022)
Article
Chemistry, Multidisciplinary
Volodymyr Dzhagan, Nazar Mazur, Oleksandr Smirnov, Oleg Yeshchenko, Oksana Isaieva, Mariia Kovalenko, Mykola Vuichyk, Mykola Skoryk, Yaroslav Pirko, Alla Yemets, Volodymyr Yukhymchuk, Mykhailo Valakh
Summary: Colloidal silver nanoparticles synthesized using Ganoderma lucidum extract are studied as a substrate for enhancement of SERS. The nanoparticles are nearly spherical with a mean size of 20-30 nm, as confirmed by SEM and DLS. The passivating layer on the nanoparticle surface is only a few nm thick, making these nanoparticles suitable for various applications involving plasmonic enhancement and charge or energy transfer.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Volodymyr Dzhagan, Nazar Mazur, Olga Kapush, Oleksandr Selyshchev, Anatolii Karnaukhov, Oleg A. Yeshchenko, Mykola I. Danylenko, Volodymyr Yukhymchuk, Dietrich R. T. Zahn
Summary: This study investigates the influence of the parameters of the shell and interface in semiconductor core/shell nanocrystals (NCs) on their optical properties and charge transfer, using Raman spectroscopy. The results show that the use of thioglycolic acid (TGA) during the synthesis leads to the formation of a CdS shell around the CdTe core in the NCs. The optical absorption and photoluminescence bands of these NCs are determined by the CdTe core, while the far-infrared absorption and resonant Raman scattering spectra are dominated by the vibrations related to the shell.
Article
Physics, Multidisciplinary
O. A. Yeshchenko, A. O. Pinchuk
Summary: Temperature has a significant impact on the surface plasmon resonance (SPR) of noble metal nanoparticles, resulting in red shifts and broadening of the SPR. The photoluminescence of silver and copper NPs shows strong temperature dependence, with different trends observed. Laser heating of gold NPs demonstrates resonant plasmonic characteristics, leading to a significant increase in NP temperature.
UKRAINIAN JOURNAL OF PHYSICS
(2021)
Proceedings Paper
Telecommunications
Yaroslav Balytskyi, Manohar Raavi, Anatoliy Pinchuk, Sang-Yoon Chang
Summary: Random number generators are essential in computing, ensuring entropy and avoiding bias is crucial for data integrity. Utilizing PT-symmetric quantum mechanics allows for improved detection and quantification of bias in randomness.
IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC 2021)
(2021)
