A5081284647- Terahertz technology and applications
- Semiconductor Quantum Structures and Devices
- Superconducting and THz Device Technology
- 2D Materials and Applications
- Magnetic properties of thin films
- Chalcogenide Semiconductor Thin Films
- Gyrotron and Vacuum Electronics Research
- Advanced Semiconductor Detectors and Materials
- Microwave Engineering and Waveguides
- Acoustic Wave Resonator Technologies
- Mechanical and Optical Resonators
- Photonic and Optical Devices
- Spectroscopy and Laser Applications
- Multiferroics and related materials
- Advanced Condensed Matter Physics
- Magneto-Optical Properties and Applications
- MXene and MAX Phase Materials
- Semiconductor Lasers and Optical Devices
- Semiconductor materials and interfaces
- Optical properties and cooling technologies in crystalline materials
- Perovskite Materials and Applications
- Millimeter-Wave Propagation and Modeling
- Photonic Crystals and Applications
- Electronic and Structural Properties of Oxides
- Advancements in Semiconductor Devices and Circuit Design
Radboud University Nijmegen
2023-2024
MIREA - Russian Technological University
2017-2022
Imperial College London
2019
Institute of Superhigh-Frequency Semiconductor Electronics of the Russian Academy of Sciences
2019
Prokhorov General Physics Institute
2019
ITMO University
2019
National Research Nuclear University MEPhI
2019
Moscow Institute of Physics and Technology
2019
Bauman Moscow State Technical University
2017-2019
Moscow State Technological University
2018
Abstract Polarization of electromagnetic waves plays an extremely important role in interaction radiation with matter. In particular, polarized ordered matter strongly depends on orientation and symmetry vibrations chemical bonds crystals. quantum technologies, the polarization photons is considered as a “degree freedom”, which one main parameters that ensure efficient computing. However, even for visible light, control most cases separated from light emission. this paper, we report new type...
CoPS3 stands out in the family of van der Waals antiferromagnets XPS3 (X=Mn, Ni, Fe, Co) due to unquenched orbital momentum magnetic Co2+ ions which is known facilitate coupling spins both electromagnetic waves and lattice vibrations. Here, using a time-resolved magneto-optical pump-probe technique we experimentally study ultrafast laser-induced dynamics mutually correlated lattice. It shown that femtosecond laser pulse acts as an heater thus results melting antiferromagnetic order. At same...
Controlled generation of coherent spin waves with highest possible frequencies and shortest wavelengths is a cornerstone spintronics magnonics. Here, using Heisenberg antiferromagnet RbMnF3, we demonstrate that laser-induced THz dynamics corresponding to pairs mutually counter-propagating the wavevectors up edge Brillouin zone cannot be understood in terms magnetization antiferromagnetic (Néel) vectors, conventionally used describe waves. Instead, propose model such correlation function. We...
We propose, fabricate, and evaluate strain-induced InGaAs/InAlAs superlattice (SL), which can efficiently radiate broadband terahertz (THz) waves. By means of optical pump-probe measurements, we demonstrate ultrashort photocarriers relaxation times τ∼1.7ps without Be-doping InGaAs photoconductive layers. assume two dominant mechanisms to be responsible for a sharp reduction τ in strained SL, are scattering at heterointerface roughness the decrease energy bandgap layers due residual strain....
III-V semiconductor light-emitting diodes (LEDs) are a promising candidate for demonstrating electroluminescent cooling. However, exceptionally high internal quantum efficiency designs paramount to achieving this goal. A significant loss mechanism preventing unity in GaAs-based devices is nonradiative surface recombination at the perimeter sidewall. To address issue, an unconventional LED design presented, which distance from central current injection area device's extended while maintaining...
Electrical control of conjugate degrees freedom in multiferroics provides the advantage reducing energy consumption to femto- and even attojoules per switch spintronics memory devices. This is achieved through development technologies that make it possible fabricate artificial materials with constantly improving properties. Here, we present design, physics, characteristics a composite multiferroic spintronic emitter, which electrical emitted terahertz (THz) wave polarization. The effect due...
We report an increase in terahertz (THz) radiation efficiency due to FeCo/WSe2 structures the reflection geometry. This can be attributed absorption alloy FeCo layer at input interface constructive interference, as well backward transport of hot carriers from WSe2. In contrast transmission geometry, THz generation is much less dependent on magnetic thickness. Our results suggest a cheap and efficient way improve characteristics spintronic emitters with conservation full set their important...
The study of ultrafast laser interaction with graphene-like materials based on transition metal dichalcogenides attracts most scientific groups. It is connected potential use these in flexible optoelectronic devices visible and THz range. In this paper the parameters generation terahertz field from surface bulk layered crystal monolayer film tungsten diselenide are analyzed. Generation radiation experimental samples was studied by time-domain spectroscopy reflection geometry. Bulk crystals...
Objectives. Terahertz time domain spectroscopy (THz-TDS) is currently a promising research method in pharmacology and medicine due to the high sensitivity of terahertz radiation chemical composition molecular structure organic compounds. However, chirality many biomolecules, their analysis performed by THz irradiation with circular dichroism. In particular, dichroism allows study “soft” vibrational movements biomolecules different chiralities. Therefore, when studying such biological...
In this article, we investigate optically induced terahertz radiation in ferromagnetic FeCo layers of varying thickness on Si and SiO2 substrates. Efforts have been made to account for the influence substrate parameters THz generated by film. The study reveals that layer material significantly affect generation efficiency spectral characteristics radiation. Our results also emphasize importance accounting reflection transmission coefficients when analyzing process. observed features...
We characterized the ultrafast properties of LT-GaAs doped with silicon [Formula: see text]-layers and introduced delta-doping ([Formula: text]-doping) as efficient method for enhancing GaAs-based structures which can be useful terahertz (THz) antenna, switches other high frequency applications. Low temperature grown GaAs (LT-GaAs) became one most promising materials optical THz devices due to its short carrier lifetime mobility. growth leads a large number point defects an excess arsenic....
Abstract An alternative approach is proposed to improve the conventional (based on low‐temperature grown GaAs and Si‐doped superlattice) photoconductive antenna (PCA) performance by modification of planar electrodes design crystallographic orientations substrate ((100) (111)‐A). The electrode scheme includes a combination logarithmic spiral, bow‐tie, plasmonic antennas results in appearance sharp resonant peaks, high spectral bandwidth signal‐to‐noise ratio, significant enhancement output...
Abstract In this work, we demonstrate an approach of local mechanical polishing processing to modify the type intrinsic piezoelectric activity γ -glycine polymorph grown in a form single crystal. By using piezoresponse force microscopy, increase intensity for both out-of-plane (3 times) and in-plane (5 tensor components is demonstrated. Application switching spectroscopy reveals behavior non-polished ferroelectric polished areas being related polishing-assistant rearrangement NH 3 + tails...
We present the results of numerical and experimental study photoconductive antennas (PCAs) based on GaAs its ternary compounds. produced three materials with different indium content, which then were applied for fabrication THz PCAs. These PCAs used as emitters pulsed spectrometer. evaluated stationary transient current generated by PCAs, simulated their I-V characteristics, compared them ones. Using finite integration method, we studied thermal properties demonstrated significant influence...
Resonant pumping of the electronic f-f transitions in orbital multiplet dysprosium ions (Dy^{3+}) a complex perovskite DyFeO_{3} is shown to impulsively launch THz lattice dynamics corresponding B_{2g} phonon mode, which dominanted by motion Dy^{3+} ions. The findings, supported symmetry analysis and density-functional theory calculations, not only provide novel route for highly selective excitation rare-earth crystal lattices but also establish important relationships between excitations oxides.
Controlling magnetic textures at ever smaller length and time scales is of key fundamental technological interest. Achieving nanoscale control often relies on finding an external stimulus that able to act small scales, which highly challenging. A promising alternative achieve using the inhomogeneity texture itself. Using a multilayered ferromagnetic Pt/Co/Pt thin-film structure as model system, we employ force microscope investigate change in nanotextures induced by circularly polarized...
Surface THz emission was observed from monolayer and bulk WSe2 via time-domain spectroscopy. Frequency temporal spectra of the generated pulses were studied. Azimuthal dependencies peak-to-peak amplitude obtained for both layered WSe2. It assumed that generation radiation in occur due to motion photoexcited carriers nonlinear processes occurring after interaction with optical femtosecond pulses.