A5016403743- Ferroelectric and Piezoelectric Materials
- Microwave Dielectric Ceramics Synthesis
- Acoustic Wave Resonator Technologies
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Microwave Engineering and Waveguides
- Wireless Power Transfer Systems
- Atomic and Subatomic Physics Research
- Energy Harvesting in Wireless Networks
- Superconducting Materials and Applications
- Plasmonic and Surface Plasmon Research
- Advanced ceramic materials synthesis
- Mechanical and Optical Resonators
- Diamond and Carbon-based Materials Research
- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Antenna Design and Analysis
- Material Properties and Applications
- Advanced MRI Techniques and Applications
- Microwave-Assisted Synthesis and Applications
- Engineering Applied Research
- Photonic Crystals and Applications
- Wireless Body Area Networks
- Microwave and Dielectric Measurement Techniques
- Nuclear materials and radiation effects
Peoples' Friendship University of Russia
2024
Research Institute of Ceramics
2012-2023
All-Russian research Institute of metrological service
2020
COI Ceramics (United States)
2020
Scientific Research Institute "Girikond" (Russia)
2001-2017
ITMO University
2016
Saint Petersburg State Electrotechnical University
2010
Euclid Techlabs (United States)
2009
Argonne National Laboratory
2009
Whitney Museum of American Art
2009
Being motivated by the recent theoretical proposal of nanoantennas based on high-permittivity dielectric spheres [A. E. Krasnok et al., JETP Lett. 94, 22113 (2011)], we suggest and verify experimentally concept all-dielectric antennas in microwave frequency range. In addition to electric resonance, each sphere exhibits a very strong magnetic resulting narrow radiation pattern overall high directivity such antennas. We find an excellent agreement between experimental data numerical results...
The existence of bound states in the continuum (BIC) manifests a general wave phenomenon first predicted quantum mechanics by John von Neumann and Eugene Wigner [J. E. Wigner, Phys. Z. 30, 465 (1929)]. Today it is being actively explored photonics, radiophysics, acoustics, hydrodynamics. We report an experimental observation electromagnetic state radiation one-dimensional array dielectric particles. By measurement transmission spectra ceramic disk chain at GHz frequencies, we demonstrate how...
Nitrogen vacancy (NV) centers in diamond have developed into a powerful solid-state platform for compact quantum sensors. However, high sensitivity measurements usually come with additional constraints on the pumping intensity of laser and pulse control applied. Here, we demonstrate NV ensemble based magnetic field low-intensity optical excitation. DC magnetometry methods like, e.g., continuous-wave optically detected resonance continuously excited Ramsey combined lock-in detection, are...
The existence of classical nonradiating electromagnetic sources is one the puzzling questions to date. Here, we investigate radiation properties physical systems composed a single ultrahigh permittivity dielectric hollow disk excited by electric or magnetic pointlike dipole antennas, placed inside inner bore. Using analytical and numerical methods, demonstrate that such can support anapole states with total suppression far-field thereby exhibit sources. It shown radiated power result...
We demonstrate experimentally Fano resonances in all-dielectric oligomers clusters of dielectric particles. study two structures consisting a ring six ceramic spheres with and without central particle that both exhibit resonant suppression the forward scattering associated resonance originated from excitation magnetic dipole modes. By employing near-field measurement techniques, we establish relation between near- far-field properties identify directly their origin. support our findings by...
We numerically investigate a magnetic resonant wireless power transfer system based on high refractive index dielectric resonators. propose to operate at quadrupole mode of the resonators enlarge efficiency due minimization ohmic and radiation losses. Numerical estimation predicts 80% (WPT) operating 300 MHz. Moreover, is capable transferring with 70% when receiver rotates 90°. verify simulated results by experimental investigation WPT microwave ceramic (ε = 80 tanδ 10−4).
Quality of spatial separation between electric and magnetic fields in an electromagnetic wave is fundamentally constrained by nonlocal nature Maxwell equations. While energy densities a wave, propagating vacuum, are equal at each point space, carefully designed photonic structures can enable surpassing this limit. Here, set high index dielectric tubes was for the first time proposed theoretically experimentally demonstrated to deliver record separation, overcoming free space scenario more...
This paper presents a low-profile, high-performance, and low-cost Ka-band circularly polarized (CP) passive phased-array antenna (PAA) system. A 1 x 4 subarray operating at the frequency band is investigated, developed, tested as possible building block for mobile satellite communication systems. In particular, CP integrated with high-performance phase shifter presented experimentally verified. new low-profile magnetic actuator proposed to precisely control state of shifter. 3-D printed...
Abstract Currently, human magnetic resonance (MR) examinations are becoming highly specialized with a pre-defined and often relatively small target in the body. Conventionally, clinical MR equipment is designed to be universal that compromises its efficiency for targets. Here, we present concept targeted imaging (MRI), which can directly integrated into existing systems, demonstrate feasibility breast imaging. The comprises spatial redistribution passive focusing of radiofrequency flux aid...
The purpose of this work is to investigate the use ceramic materials (based on BaTiO3 with ZrO2 and CeO2-additives) very high relative permittivity (εr ∼ 4500) increase local transmit field signal-to-noise ratio (SNR) for commercial extremity coils a clinical 1.5 T MRI system.Electromagnetic simulations efficiency specific absorption rate (SAR) were performed using four ferroelectric blocks placed around cylindrical phantom, as well placing these ceramics wrist human body model. Results...
Metasurfaces have been investigated and its numerous exotic functionalities the potentials to arbitrarily control of electromagnetic fields extensively explored. However, only limited types metasurface finally entered into real products. Here, we introduce a concept metasurface-based smart table for wirelessly charging portable devices report first prototype. The proposed can efficiently transform evanescent propagating waves which significantly improves near field coupling charge receiving...
Abstract Nonradiating sources of energy realized under a wave scattering on high-index dielectric nanoparticles have attracted lot attention in nano-optics and nanophotonics. They do not emit to the far-field, but simultaneously provides strong near-field confinement. Near-field wireless power transfer technologies suffer from low efficiency short operation distance. The key factor improve is reduce radiation loss resonators included transmitter receiver. In this paper, we develop system...
Anomalous dependencies of the dynamic (pulse) and static tunability [k(U)=C(0)/C(U)] as a function permittivity (ε) were observed in ferroelectric varactors based on doped paraelectric state (Ba,Sr)TiO3 ceramics. The reduction relatively high value from ε≅810 down to ε≅260 by introducing various proportions Mg2TiO4 additive resulted 20% increase tunability. Furthermore, ceramics with this have demonstrated noticeably higher than tunability, also unexpected for type material.
A study on the strength of samples multilayer dental ceramics based zirconium dioxide domestic and Chinese production with three-point bending is provided. Dentures made are sintered in clinical practice using traditional multi-hour or high-speed method. The sintering mode requires a long time, careful control temperature, heating speed guarantees high aesthetics during prosthetics. sinters quickly, efficiently provides high-quality connection all layers shorter however, it can lead to...
Quantum sensors are keeping the cutting-edge sensitivities in metrology. However, for high-sensitive measurements of arbitrary signals, limitations linear dynamic range could introduce distortions when sensing frequency, magnitude and phase unknown signals. Here, we overcome these with advanced protocol that combines quantum phase-sensitive detection heterodyne readout. We present theoretical experimental investigations using nitrogen-vacancy centers diamond, showing ability to sense radio...
Bulk ferroelectric composite ceramics based on mixtures of BaTiO3/SrTiO3 powders with Mg-containing additives such as Mg2TiO4, MgO in a wide range compositions were fabricated and characterized. Phase relations, crystal structures, microstructures dielectric properties ferroelectrics investigated. The best composition respect to the overall combination permittivity, tunability loss factor was found have ϵ = 103, tanδ ≤ 0.002 at f 3.5 GHz 5–6% 15 kV/cm biasing field. This electrical...
The spatial resolution and signal-to-noise ratio (SNR) attainable in magnetic resonance microscopy (MRM) are limited by intrinsic probe losses probe-sample interactions. In this work, the possibility to exceed SNR of a standard solenoid coil more than factor-of-two is demonstrated theoretically experimentally. This improvement achieved exciting first transverse electric mode low-loss ceramic resonator instead using quasi-static field metal-wire coil. Based on theoretical considerations, new...
The sensing applications of nitrogen-vacancy color centers in a diamond require an efficient manipulation the center ground state over whole volume ensemble. Thus, it is necessary to produce strong uniform magnetic fields well-defined circular polarization at microwave frequencies. In this paper, we develop circularly polarized antenna based on excitation hybrid electromagnetic modes high-permittivity dielectric resonator. influence geometrical parameters reflection coefficient and field...