S. S. Golik

• Far Eastern Federal University

With the development of optics and photonics, research into the possibilities of photonic crystals (PCs) is becoming increasingly popular. A well-known property of such structures is their ability to control the light passing through them due to the so-called photonic bandgap (PBG). In one-dimensional (1D) PCs, defect modes (DMs) represent resonant...

Here we investigated the linear nonreciprocal and tunable in helically structured 1D photonic crystals in external magnetic field when the parameter of magneto-optical activity g is constant and is independent of wavelength. We will demonstrate the existence of this effect and its tunability. We will investigate some new and interesting features of...

This paper compares two ways of determining the sensitivity of an optical sensor - absolute and relative. The importance of using relative sensitivity for objective comparison of different optical sensors was demonstrated using the example of an optical sensor based on a one-dimensional photonic crystal with a defect. Finally, the parameters that p...

We propose an improved structure of an optical biosensor based on a photonic crystal with a defect layer, which can detect the concentration of organic contaminants in water by defect mode shift. We investigated 4 types of defective photonic crystals with different arrangements of layers inside the perfect photonic crystals and their impact on the...

In this paper, we investigate the light absorption in helically structured photonic crystals (HSPCs) in an external static magnetic field in the case when the parameter of magneto-optical activity is a function of the light wavelength. We investigate and compare the spectra of absorption, the spectra of imaginary parts of wave vectors of forward pr...

The spectral characteristics of plasma generated on the surface of human hairs under various focusing conditions (lenses with focal lengths 50, 100, and 150 mm) by short (9 ns) laser pulses with energies from 50 to 50 mJ were experimentally studied by elemental analysis along the length of the samples. The minimal energies of the laser pulses were...

The effect of the duration of laser pulses of 40 and 650 fs with an energy of 1.1 mJ at a wavelength of 800 nm on the spectral-temporal characteristics of plasma during femtosecond laser-induced breakdown spectroscopy of human hair has been studied. The time dependences of the radiation line intensities of Ca I 422.6 nm, C I 193.1 nm, C I 247.8 nm,...

We experimentally studied the spectral characteristics of plasma generated on the surface of human hair under various focusing conditions (by the lenses with a focal length of 50, 100, 150 mm) by short (9 ns) laser pulses with an energy from 5 to 50 mJ in the regime of elemental composition analysis along the length of the samples. The minimal ener...

In this paper we investigated the magneto-optical properties of helically structured photonic crystals taking into account the wavelength dependence of magneto-optical activity parameter and wavelength independence of Verdet constant. We compare the obtained results with the case of the wavelength independence of magneto-optical activity parameter....

64-й Всероссийской научной конференции МФТИ 29 ноября-03 декабря 2021 года ЭЛЕКТРОНИКА, ФОТОНИКА И МОЛЕКУЛЯРНАЯ ФИЗИКА Москва-Долгопрудный-Жуковский МФТИ 2021

The features of the optical properties of cholesteric liquid crystals (CLC) with enormous magneto-optical activity were investigated. It is shown that the system under consideration has the property of nonreciprocal reflection / transmission, absorption and light energy localization. It was shown that this system can work as an almost ideal tunable...

We propose a new method for calculating reflection and transmission coefficients for an arbitrarily polarized electromagnetic plane wave incident on a one-dimensional dielectric medium of finite thickness and with dielectric permittivity being an arbitrary continuous function of the coordinate. We have shown that the problem of plane wave scatterin...

We propose a new optical biosensor based on a photonic crystal with a defect layer, which can determine the SARS-CoV-2 concentration in water by the defect mode shift. Two models of the dependence of the refractive index of the defect layer on the concentration of the pathogen in water were considered. The optimal parameters for the photonic crysta...

The paper presents the femtosecond laser filamentation, which splits the liquid spray into two jets. The dependence is suggested for the acoustic signal and the femtosecond pulse energy, which identifies the liquid spray threshold.

Highly efficient on-chip asymmetric absorption devices are indispensable for all-optical computing, information processing, etc., but the asymmetric absorption of light has rarely been investigated. Currently, on-chip asymmetric absorption devices still have some limitations, such as low contrast of absorption, narrow working bandwidth, and polariz...

We propose a new optical biosensor based on a photonic crystal with a defect layer, which can determine the SARS-CoV-2 concentration in water by the defect mode shift. Two models of the dependence of the refractive index of the defect layer on the concentration of the pathogen in water were considered. The optimal parameters for the photonic crysta...

A numerical model describing the dynamics of plasma particle density upon filamentation of femtosecond emission in air is presented. The simulation results are in good agreement with the available experimental data. The pumping processes of the N2 and N2+ radiative levels are investigated. The model predicts a tight drop in the electron temperature...

We propose a new method for calculating reflection and transmission coefficients for an arbitrarily polarized electromagnetic plane wave incident on a one-dimensional dielectric medium of finite thickness and with dielectric permittivity being an arbitrary continuous function of the coordinate. We have shown that the problem of plane wave scatterin...

The features of light absorption and localization in one-dimensional chirped photonic crystals (PCs) are studied. It is shown that although chirping leads to the loss of ideal periodicity, the integral over a wide spectral region light energy density practically does not change. We have shown that violation of the ideal periodic structure (chirping...

Cholesteric liquid crystals (CLCs) with induced defects are one of the most prominent materials to realize compact, low-threshold and tunable coherent light sources. In this context, the investigation of optical properties of induced defect modes in such CLCs is of great interest. In particular, many studies have been devoted to the spectral contro...

The optical properties of cholesteric liquid crystals (CLCs) exhibiting magneto-optical activity in the presence of an external static magnetic field have been investigated. The boundary-value problem of light transmission through a finite layer of a magnetoactive CLC at normal incidence of light is considered in the limiting case of the absence of...

We investigated the features of the optical properties of magnetoactive cholesteric liquid crystals (CLCs) in an external static magnetic field. The boundary-value problem of light transmission through a finite layer of a magnetoactive CLC at normal light incidence and light reflection from a half-space is considered. We also investigated the evolu...

In this paper, the optical properties of a one-dimensional symmetric ternary photonic crystal and the possibility of its application to the approximation of continuous rugate photonic crystals were investigated. For this purpose, the parameters of the ternary crystal were determined from the condition of equality of several first Fourier coefficien...

We consider and compare the peculiarities of nonreciprocal optical properties of the following three systems: a) a planar layer of cholesteric liquid crystal (CLC) in the external magnetic field directed along the CLC helix axis, b) an asymmetric Fabry-Perot resonator with a planar CLC layer inside and, finally, c) an asymmetric Fabry-Perot resonat...

The capabilities of filament-induced breakdown spectroscopy for the analysis of the elemental composition of aqueous aerosols were estimated. The diameter of aqueous aerosol droplets in the atmosphere was 0.8–2.0 μm. The emission lines of the chemical elements were excited by fi lamentation of femtosecond laser pulses (60 fs, 800 nm, 4.4 mJ) in wea...

In our paper, the magneto-optical properties of a dichroic cholesteric liquid crystal layer with large values of magneto-optical parameter g and low values of dielectric permittivity were investigated. The solutions of the dispersion equation and their peculiarities were investigated in detail. The specific properties of reflection, transmission, a...

Background. Currently, the priority task is to develop the resources of the continental shelf. At the same time, ensuring the environmental safety of marine areas remains an important aspect. In this regard, the development and creation of robotic systems equipped with specialized complexes capable of solving a wide functional range of underwater o...

A numerical model describing the dynamics of plasma particle density upon filamentation of femtosecond radiation in the air is presented. The simulation results are in good agreement with the experimental data. The pumping processes of the N2 and N2+ radiative levels are investigated. The model predicts a sharp drop in electron temperature and dens...

Under the action of a filament of a femtosecond laser pulse, the splitting of a water aerosol jet into two was experimentally recorded. The dependence of the magnitude of the acoustic signal on the energy of the femtosecond pulse is obtained, according to which the threshold for the explosion of water aerosol is determined.

In this paper, we review photonic methods and technologies that are promising for monitoring the ocean and atmosphere and have been implemented mainly in recent years at the Institute of Automation and Control Processes, Far Eastern Branch, Russian Academy of Sciences. We present results of lidar studies that have made it possible to understand key...

In this paper, we studied the influence of medium parameters and the wavelength of incident light on Faraday’s rotation and on the ellipticity of polarization. The results of comparison of these dependencies for bulk (unbounded) media, for a layer of a magnetically active medium of finite thickness and, finally, for a magneto-photonic crystal layer...

The peculiarities of transmission and angular non-reciprocity in magneto-photonic crystals (MPC) are investigated. The problem of light transmission through magneto-photonic crystal is solved by Ambartsumian's modified layer addition method. It is shown that the system under consideration can work as a wide band ideal optical diode for orthogonal c...

The development of underwater robotics sensitivity, which is based on the sensors of laser spectroscopy methods, have been discussed. The ways to improve Laser Induced Fluorescence (LIF) and Laser Induced Breakdown Spectroscopy (LIBS) methods were investigated in order to develop and create laser sensitivity for underwater robotics. A brief overvie...

Specific features of the energy-band structure of magneto-photonic crystals have been studied. The problem of the propagation of light through a finite layer of a magneto-photonic crystal has been solved by the modified Ambartsumyan layer-summation method. The effect of the direction of an external magnetic field on the band structure has been stud...

We study the broadening and shift of N I ( λ = 746.8 nm) and O I ( λ =777.4 nm) lines in a plasma of filaments generated by a tightly focused femtosecond laser pulse (0.9 mJ, 48 fs). It is shown that the dynamic Stark effect makes a major contribution to the broadening and shift of the N I line ( λ =746.8 nm). It is found that amplified spontaneous...

The spectral lines broadening in femtosecond laser plasma generated by the 45 fs Ti:Sa laser pulses on the surface of the water solutions of Ba is investigated. Under the experimental conditions, determined the temperature of femtosecond laser plasma is 3000K.The contribution of the Doppler broadening for spectral lines width is minimal and amounts...

Experimentally studied linear and nonlinear characteristics of colloid on the basis of a new class of carbon nanoparticles (CN) synthesized by hydrothermal synthesis. The spectral characteristics of supercontinuum of the colloids with CN in the range 420 - 700nm were investigated. The effectiveness of excitation of one- and two-photon fluorescence...

The temporal evolution of the width and shift of N I 746.8 and O I 777.4 nm lines is investigated in a filament plasma produced by a tightly focused femtosecond laser pulse (0.9 mJ, 48 fs). The nitrogen line shift and width are determined by the joint action of electron impact shift and the far-off resonance AC Stark effect. The intensive (I = 1.2·...

Temporal behavior of the intensity of Ba I emission lines (413.24 and 553.55 nm) in plasma of optical breakdown induced by femtosecond laser pulses (800 nm, 45 fs, 0.82 mJ) on the surface of BaCl2 aqueous solution was experimentally studied as dependent on delay time td relative to the breakdown onset. The maximum intensity of the Ba I (413.24 nm)...

We have studied the peculiarities of diffraction of light in magnetic photonic crystals at large values of magnetooptical activity parameter and modulation depth. We have considered the case of an arbitrary angle between the directions of the external static magnetic field and the normal to the layer. The problem has been solved by the modified Amb...

In this work we studied light diffraction in magneto-photonic crystals (MPC) having large magneto-optical activity and modulation large depth. The case of arbitrary angles between the direction of the external static magnetic field and the normal to the border of the MPC layer is considered. The problem is solved by Ambartsumian’s modified layer ad...

The results of experiments on the study of spatial characteristics of the multiple filamentation domain of GW Ti:Sapphire laser pulses in glass are presented. The dependences of the coordinates of the beginning, end, and diameter of the multiple filamentation domain (MFD) vs the laser pulse energy are derived. It is found that when the average inte...

The complex process of supercontinuum generation (SG) is known to be exploitable for designing spatially coherent white light sources emitting light simultaneously in the ultraviolet, visible, and infrared ranges. Herein the first natural material able to generate in laboratory conditions a supercontinuum similar to those known from man-made photon...

Results are presented of experiments on investigation of the spatial characteristics of multi-filamentation region of giga- and terawatt pulses of a Ti:sapphire laser in a glass. Dependences are obtained of the coordinate of the beginning of filamentation region, number of filaments, their distribution along the laser beam axis, and length of filam...

The regularities of multiple filamentation of gigawatt femtosecond laser pulses in a solid dielectric (optical glass) have been considered. The fine spatial structure of the plasma region that is formed under glass photoionisation and accompanies the formation of light filaments is analysed experimentally and by means of numerical simulation. The d...

Results of an experimental study of spatial parameters of the region of multiple filamentation of gigaand terawatt pulses of a Ti:Sapphire laser in glass and water are described. The pulse-power dependencies of the coordinates of the filamentation region, the number of filaments, their distribution along the laser beam axis, and the mean length of...

Properties of multiple filamentation of gigawatt femtosecond laser pulses in optical glass are considered. The fine structure of the plasma region that is produced upon photoionization of quartz and accompanies light filaments are analyzed experimentally and in numerical simulation. The dependence of the number, position, and length of individual g...

The results of experimental studies of the spatial characteristics of multiple filamentation terawatt femtosecond Ti:Sa-laser in water are presented. With an increase in initial power laser pulses increases the number of filaments, the length of the field is increased filamentation and reducing the length of the filaments have been shown. The distr...

The results of experiments to study the spatial characteristics of multiple filamentation gigawatt laser pulses in the glass are presented. It is shown that with increasing pulse power multiple filamentation region increases in length and diameter, the distribution of filaments within the region has a maximum value when the power > 105 Pcr area fil...

The energy absorbed by femtosecond laser plasma has nonlinear dependence on incident laser energy. The threshold power for plasma formation is 5.2 GW. Emission of nitrogen molecule, nitrogen molecule ion, atomic oxygen (unresolved triplet O I 777 nm) and nitrogen (triplet N I 742.4, 744.3 and 746.8 nm) lines is detected. Molecular emission consists...

The Raman spectra of femtosecond laser pulses in distilled and tap water, and luminescence spectra of aqueous solutions containing dissolved organic matter, chlorophyll "a" and biological objects excited by ultra-short laser pulses was investigated.

The influence of pulse energy on the time evolution of the intensity of the continuum and emission lines of plasma generated on the surface of aqueous solutions of iron by focused radiation Ti: sapphire laser with a wavelength of 800 nm and pulse duration of 45 fs and a range of energy 3-7 mJ was investigated. The calibration curve for iron in wate...

The results of experimental studies of the spatial characteristics of multiple filamentation terawatt femtosecond Ti:Salaser in water are presented. With an increase in initial power laser pulses increases the number of filaments, the length of the field is increased filamentation and reducing the length of the filaments have been shown. The distri...

The forms and intensities of Raman lines and chlorophyll A fluorescence have been researched when excited at 532 nm, depending on the duration of the pulses of the exciting radiation. The duration of continuous operation ranged from emission to 120 fs.

The influence of the energy of femtosecond laser pulses on the intensity of Fe I (371.99 nm) emission line and the continuous spectrum of the plasma generated on the surface of Fe3+ water solution by a Ti:sapphire laser radiation with pulse duration <45 fs and energies up to 7 mJ is determined. A calibration curve was obtained for Fe3+ concentratio...