Nikolay Balbekin

Nikolay Balbekin
ITMO University | SPbNRU ITMO · Department of Photonics and Optical Information Technology

PhD

About

36
Publications
9,173
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284
Citations
Introduction
Nikolay Balbekin currently works at the Department of Photonics and Optical Information Technology, ITMO University. Nikolay does research in Optics. Their current project is 'Development of methods for the calculation of diffractive optical elements on the basis of wavefront adaptive optimization algorithms '.
Additional affiliations
September 2012 - present
ITMO University
Position
  • Engineer

Publications

Publications (36)
Article
Full-text available
The aim of this article is to demonstrate the possibility of using photogrammetry as a method for documenting and digitizing data reconstructed from a display hologram. We discuss the importance of the task of digitizing information from holograms and the search for its solution, which will allow display holography to gain new distribution. Texture...
Conference Paper
In this contribution, we discuss the features of design and polarimetric inspection of terahertz achromatic waveplates. The design of the crystalline quartz half-wave plate was performed taking into account the ellipticity and the introduced phase difference between the orthogonal components of the output radiation polarization vector. The designed...
Article
Full-text available
A new method for diagnosis of diabetes mellitus is proposed, which uses for measurement a lyophilized blood plasma sample prepared in the form of a pellet. The paper develops a methodology for fast spectroscopic measurements of such pellets with terahertz pulse time-domain holography. For that reason, blood plasma pellets were experimentally measur...
Article
When calculated in the spectral domain, the propagation of an ultrashort optical pulse may suffer from inaccuracy due to the finite thickness of the object it diffracts on. Unlike monochromatic radiation, ultrashort pulse interaction with an object in the time domain depends on the pulse longitudinal coordinate. Here, we propose an algorithm to stu...
Article
Full-text available
Abstract In this paper, we present a novel numerical approach for increasing the resolution of retrieved images of objects after their diffraction patterns are recorded via terahertz pulse time-domain holography (THz PTDH). THz PTDH allows for spectrally resolved imaging with high spatial resolution and does not require the fine alignment of comple...
Conference Paper
Using the THz-PTDH method we have created the theoretical model and experimental set up for phase imaging of breast tissue sample and designed the image reconstruction procedure suitable for a cancer diagnostics.
Article
Full-text available
In this paper we demonstrate the method of widefield amplitude-phase object images reconstruction from the spatially-limited broadband terahertz wavefield spectral components distributions in the Fresnel diffraction zone, based on the wave propagation equations iterative solution algorithm. Using of this method allows one to overpass the spatial re...
Article
New methods have been developed for noninvasive monitoring of pathological processes in a living organism by means of terahertz spectroscopy and visualization using contrast agents based on magnetic nanoparticles. The nanoparticles must possess good magnetic characteristics, must be nontoxic and stable against aggregation, and must exhibit chemical...
Article
Optical characteristics of polymerization products under variable degrees of neutralization of acrylic acid (AA) and cross-linking agent and at a fixed content of redox components have been studied by IR spectroscopy of frustrated total internal reflection and THz spectroscopy. The results of the analysis show that absorption of IR radiation and di...
Article
Full-text available
We propose a mathematical model for holographic relief reconstruction of phase objects based on the analysis of diffraction patterns of pulsed terahertz radiation, recorded in a dispersive medium. Numerical simulation shows the influence of the dispersion medium on the process of phase and relief reconstruction: disregard of the dispersion due to t...
Article
Full-text available
We present measurements of optical characteristics of sodium polyacrylate in the terahertz frequency range and discuss how material dispersion affects object visualisation in terahertz imaging. We demonstrate how important is to take into account the material dispersion for phase and relief reconstruction of the investigated object.
Article
Full-text available
This paper is devoted to studying of optical properties of whole blood and blood plasma in SHR mice grafted Ehrlich's carcinoma and mice with chronic inflammation at the terahertz frequency range. Additionally physiological saline solution suspension of ascites Ehrlich's carcinoma cells was explored.
Article
Full-text available
This paper is devoted to research influence of creatinine and triglycerides on THz optical properties of blood for diabetes care purposes.
Article
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The study revealed the most promising candidates for phantoms mimicking different biological tissues in the terahertz frequency range. Closest to biological tissues in terms of the refractive index appeared to be gelatin-based gels; in terms of the absorption coefficient they were agar-based gels. Gelatin is more stable in time, but requires specia...
Conference Paper
Full-text available
In this paper, we discuss the features of numerical simulation of propagation of the two-dimensional pulsed broadband terahertz (THz) fields. A set of separate spectral components used to describe diffraction of broadband THz pulses. To eliminate sampling theorem restriction in the numerical simulation of diffraction process for the complete spectr...
Article
Full-text available
The optical properties of normal fibroblasts and fibroblasts cultured with cancer cells were studied in the frequency range of 0.2 - 1.0 THz. The results show the possibility to distinguish healthy cells from corrupted ones using their optical parameters.
Conference Paper
Full-text available
In this paper we consider using the terahertz (THz) time domain spectroscopy (TDS) for non destructive testing and determining the chemical composition of the vanes and rotor-blade spars. A versatile terahertz spectrometer for reflection and transmission has been used for experiments. We consider the features of measured terahertz signal in tempora...
Conference Paper
Full-text available
Characterization of absorption lines of the degraded deoxyribonucleic acid (DNA) in the range of 0.1 – 1 THz measured by terahertz pulsed and continuous spectroscopy. DNA intramolecular vibrations, vibrations of the hydrogen bonds between two strands of DNA and vibrations responsible for the changes in molecular conformation of DNA when dissolved i...
Article
Full-text available
The experimental setup of versatile pulse terahertz reflection and transmission spectrometer and operation concept were described. Using this setup the temporary forms of THz signal reflected from and transmitted through the samples like amino acids, dental tissue and normal were obtained. The possibility of structural determination of powdered med...
Article
Full-text available
An experimental comparison of four methods of wavefront reconstruction is presented. We considered two iterative and two holographic methods with differences in mathematical models and reconstruction algorithms. The first two of these methods do not use the reference wave in the recording scheme that reduces the need of setup stability. A set of sp...
Article
Full-text available
We have studied the mechanisms underlying the effect of pulsed broadband terahertz radiation on the growth of neurites of sensory ganglia using a comparative analysis of measured reflection spectra of ganglion neurites (in the frequency range 0.1 – 2.0 THz) and spectra obtained by numerical simulation with CST Microwave Studio. The observed changes...
Conference Paper
Full-text available
We propose a new method of cancer diagnostics based on identification of characteristic cancer spectral lines in the frequency range of 0.1–2 THz. Using terahertz spectral database of normal and pathological human tissues we could monitor the slightest changes caused by the appearance of cancer at the early stages.
Conference Paper
Full-text available
The dispersion of penetration depth of terahertz radiation in various human pathological tissues were obtained and analyzed for development of subcutaneous diseases diagnostics in terahertz frequency range.
Article
Full-text available
We report measurements of the real and imaginary part of the optical properties of graphene (refractive index, permittivity, conductivity, penetration depth) in the far-infrared region from 0.1 to 1.2 THz at the temperature of 300 K.
Article
Full-text available
The spectra of the degraded DNA of herring are studied using two methods of THz spectroscopy that employ a femtosecond laser and a frequency synthesizer based on a BWO and a high-Q cavity. An interpretation of the experimental results is presented.

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