A5086132609- Spectroscopy and Laser Applications
- Terahertz technology and applications
- Advanced Chemical Sensor Technologies
- Superconducting and THz Device Technology
- Gyrotron and Vacuum Electronics Research
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Photonic and Optical Devices
- Physics of Superconductivity and Magnetism
- Semiconductor Quantum Structures and Devices
- Chemical Thermodynamics and Molecular Structure
- thermodynamics and calorimetric analyses
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Quantum Chemical Studies
- Analytical Chemistry and Chromatography
- Atomic and Subatomic Physics Research
- Microwave Engineering and Waveguides
- DNA and Nucleic Acid Chemistry
- Advanced Chemical Physics Studies
- Gas Sensing Nanomaterials and Sensors
- Advanced Electrical Measurement Techniques
- Near-Field Optical Microscopy
- Laser Design and Applications
- Metabolomics and Mass Spectrometry Studies
- Quantum optics and atomic interactions
N. I. Lobachevsky State University of Nizhny Novgorod
2015-2024
Institute for Physics of Microstructures
2015-2024
Nizhny Novgorod State Pedagogical University
2016-2023
Nizhny Novgorod State Technical University
2016-2023
Institute of Applied Physics
1979-2023
Institute of Physical Materials Science
2016-2021
ITMO University
2015-2020
Czech Academy of Sciences, Institute of Physics
2018
Faseroptische Systeme Messtechnik (Germany)
2017
National Institute for Materials Science
2017
We studied an influence of continuous terahertz (THz) radiation (0.12 - 0.18 THz, average power density 3.2 mW/cm2) on a rat glial cell line. A dose-dependent cytotoxic effect THz is demonstrated. After 1 minute exposure relative number apoptotic cells increased in 1.5 times, after 3 minutes it doubled. This result confirms the concept biological hazard intense radiation. Diagnostic applications can be restricted by and time.
This manuscript describes harmonic generation in semiconductor superlattices, starting from a nonequilibrium Green's functions input to relaxation rate--type analytical approximations for the Boltzmann equation which imperfections structure lead asymmetric current flow and scattering processes under forward reverse bias. The resulting current-voltage curves predicted consequences on generation, notably development of even harmonics, are good agreement with experiments. Significant output...
The work is devoted to studying the metabolites composition for human urine of prostate cancer and benign prostatic hyperplasia patients by terahertz (THz) high-resolution gas spectroscopy. comparison formed during thermal decomposition collected with preliminary massage, without massage was carried out. THz spectrometer 118-178 GHz frequency range fast sweeping developed authors used. Free online spectroscopy databases were used identification substances. sets two types samples are revealed...
The work is devoted to studying the composition for grain (barley and wheat) by terahertz (THz) high-resolution gas spectroscopy. comparison of set chemical compounds formed during thermal decomposition cereals produced from was carried out with using a spectrometer phase-switching radiation in range 115-175 GHz acting on studied developed authors. Free online spectroscopy databases were used identification substances. results molecular profiles mixtures products two varieties barley, pearl...
The work is devoted to applications of terahertz spectroscopic technique and methods for ecological monitoring. Preliminary quantum-chemical calculations rotational spectra some chlorine-containing substances studied were carried out. measurements the absorption lines spectrum a number (dichloromethane, chloroform) out in 2-mm range using spectrometers developed by authors. substances, revealed during investigations, can be used
We report on the phase locking of a 3.4 THz third-order distributed feedback quantum cascade laser (QCL) using room temperature GaAs/AlAs superlattice diode as both frequency multiplier and an internal harmonic mixer. A signal-to-noise level 60 dB is observed in intermediate signal between 18th 190.7 GHz reference source 3433 QCL. phase-lock loop with 7 MHz bandwidth results QCL emission that 96% locked to source. characterize electrical tuning mechanisms show dependence these can prevent...
Abstract A THz nonstationary high-resolution spectrometer based on semiconductor superlattice multipliers is applied to investigate the dynamics of urine composition for cancer patients treated with chemotherapy. The molecular healthy volunteers and was compared contrasted. We have found a set nitriles that either appeared after chemotherapy or increased in content, which are expected as result bio-chemical damage liver. While no can be detected at this stage by existing clinical methods,...
A superconducting integrated receiver (SIR) comprises all of the elements needed for heterodyne detection on a single chip. Light weight and low power consumption combined with nearly quantum-limited sensitivity wide tuning range local oscillator make SIR perfect candidate many practical applications. For first time, we demonstrated capabilities technology remote operation under harsh environmental conditions spectroscopy at atmospheric limb sounding board high-altitude balloon. Recently,...
We apply a hybrid nonequilibrium Green’s functions and relaxation rate approximation approach to investigate frequency multiplication in the gigahertz terahertz range delivering results good agreement with experimental data for different input frequencies. A discussion of current limitation housing designs superlattices is given, based on simple model local electric field comparison measured powers delivered by backward wave oscillator.
Abstract Optical nonlinearities are of perpetual importance, notably connected with emerging new materials. However, they difficult to exploit in the gigahertz–terahertz (GHz–THz) range at room temperature and using low excitation power. Here, we present a clear-cut theoretical experimental demonstration real time, power, control GHz–THz nonlinearities. The nonlinear susceptibility concept, successful most materials, cannot be used here show contrast, complex interplay between applied...
Significance: The creation of fundamentally new approaches to storing various biomaterial and estimation parameters, without irreversible loss any biomaterial, is a pressing challenge in clinical practice. We present technology for studying samples diabetic non-diabetic human blood plasma the terahertz (THz) frequency range. Aim: main idea our study propose method diagnosis these THz Approach: Venous from patients with type 2 diabetes mellitus conditionally healthy participants was...
We propose a new method of molecular microwave spectroscopy together with analysis resonance line shapes, based on the fast passage effect. The effect is excitation coherent spontaneous radiation tested molecules using frequency sweep over absorption line. show that shape can be reconstructed from received detector signal use Hilbert and Fourier transformations. find sensitivity spectrometer higher than an ordinary pulsed Fourier-transform spectrometer. proposed useful tool for gas mixtures.
The results of a detailed study the microwave linewidth Nb-AlO/sub x/-Nb flux flow oscillators (FFO) are presented. dependence FFO on junctions parameters has been measured by using an improved technique based harmonic mixing in frequency range 250-600 GHz. Experimental data compared with theoretical estimates to evaluate influence possible mechanisms responsible for broadening linewidth. origins increased at transition from resonant "pure" flux-flow regime discussed. measurements locked...
Анализ выдыхаемого воздуха: физические методы, приборы и медицинская диагностика, Вакс В.Л., Домрачева Е.Г., Собакинская Е.А., Черняева М.Б.
Significance. One of the modern trends in medical diagnostics is based on metabolomics, an approach allowing determination metabolites which can be specific features disease. High-resolution gas spectroscopy allows investigation metabolite content samples biological origin. We present elaboration a method studying diabetic and non-diabetic samples, prepared as pellets, by terahertz (THz) high-resolution spectroscopy. Aim: The main idea work thermal decomposition products dried blood plasma...
The combination of narrow linewidth and wide band tunability makes the Josephson flux flow oscillator (FFO) a perfect on-chip local for integrated sub-mm wave receivers for, e.g., spectral radio astronomy. feasibility phase locking FFO to an external reference is demonstrated experimentally. A as low 1 Hz (determined by resolution bandwidth spectrum analyzer) has been measured in frequency range 270–440 GHz relative oscillator. This far below fundamental level given shot thermal noise...
Stochastic fields can play a 'constructive' role in their interaction with quantum systems. In this paper, we demonstrate that the phase-diffusion field (PDF) terahertz range (THz) induces macroscopic polarization molecular gas. We explain observed effect using simple model which PDF is treated as series of ultrashort pulses regular signal, resulting transient absorption The experimental investigation carried out ammonia, and generated by an oscillator based on stacks Bi2Sr2CaCu2O8 intrinsic...