Anton N. Tcypkin

Anton N. Tcypkin
ITMO University | SPbNRU ITMO · Department of Photonics and Optical Information Technology

Doctor of Philosophy

About

86
Publications
8,171
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
734
Citations
Introduction
Femtosecond Optics and Femtotechnologies Laboratory, ITMO University - group leader. Laboratory of Quantum Processes and Measurements, ITMO University - head. Research interests: Femtosecond optics, nonlinear optics, spectral supercontinuum, pulses of a few oscillations , coherence, optical information transmission, terahertz spectroscopy, terahertz imaging, filamentation

Publications

Publications (86)
Conference Paper
Full-text available
In this work the results of simulation of single- and multi-cycle pulse collimation are shown. Spatial and temporal field distribution of single-cycle pulse, which is typical for instance for THz radiation, were compared with the field distribution of multi-cycle pulse under the same conditions. Spatial chirp was observed for a single-cycle pulse -...
Article
Synthesis of acrylate based nanocomposites for photonic applications were performed, and the influence of gold and chalcogenide glass nanoparticles on optical parameters of nanocomposite layers at high laser intensities was investigated. Whereas the polymerization, recording of optical gratings or other elements and variations of their functional p...
Conference Paper
A detailed analysis of the applicability limits the z-scan method exhibit when employed for THz radiation is conducted. THz pulses feature critically wide spectrum and ultrashort duration, which leads to a significant decrease in the accuracy of the results obtained by z-scan method. The work presents the estimations of the z-scan method accuracy o...
Article
The nonlinear response of liquids in the terahertz regime has recently attracted significant interest, even though very few measurements have been reported. Here, we report on our measurements based on a z-scan technique of the nonlinear refractive-index coefficient n2 at terahertz frequencies for several liquids with noncentrosymmetric molecules,...
Article
Our recent theoretical studies of generation of ultrashort pulses based on collective spontaneous emission from a thin resonant medium layer excited by a pair of high-frequency (compared to the transition frequency of the medium) pulses are reviewed. The source of generated radiation is a resonant polarization pulse in the medium (“stopped polariza...
Article
Full-text available
Despite the growing interest in nonlinear devices and components for light by light control in the terahertz range, there is a shortage of such materials and media used for these purposes. Here, we present the calculated values of low-inertia nonlinear refractive index coefficient for electro-optical crystals used in THz time-domain spectroscopy sy...
Article
By using subpicosecond terawatt infrared pulses, we demonstrate strong x-rays generation in flat water jet. Varying the pump energy, pulse duration and its chirp along with measuring the angular x-ray distribution, we define the conditions which allow achieving the most intense x-ray emission. The terawatt powers made it possible to reveal two char...
Article
Full-text available
Resonant semiconductor nanoparticles which improve both light trapping and scattering have recently emerged as an additional tool for enhancing the efficiency of perovskite solar cells. Among the various types of nanostructures, silicon nanoparticles which support Mie modes and have lower losses compared to metallic particles with plasmon resonance...
Article
Full-text available
The work present investigates the dependence of the coherence time of an individual spectral supercontinuum on the intensity of femtosecond pumping during its generation in the water jet in the absence of filament. The results obtained show that the coherence time decreases along with pump intensity increase. Experimentally and by means of numerica...
Article
Full-text available
Lead halide perovskites were known to be a prospective family of materials for terahertz (THz) generation. On the other hand, perovskite nanostructures, nanoantennas, and metasurfaces allow tailoring perovskites optical characteristics, resulting in more efficient interaction with incident or emitted light. Moreover, the perovskites are robust mate...
Article
We consider the propagation of intense femtosecond pulses in a dielectric medium with an induced plasma. This plasma is excited by the strong electric field of the pulses, stimulating sequential electron transition to the conductivity band through excited discrete energy states. It is demonstrated that this simple dynamic model of ultrashort optica...
Article
Full-text available
In this paper, we consider a Huygens filter for a specified frequency lying within a broad spectrum of a pulsed THz radiation which represents simplest two-zone plate. The condition of the infinite plane wave and the Gaussian beam are separately used as the initial source has been discussed. A property method of terahertz spectral filter has been e...
Article
Full-text available
We present the excited-state dynamics and optical properties of Fe- and Nd-diffusion doped zinc selenide polycrystals with different concentration measured by pump-probe spectroscopy in the visible and NIR range (400-1000 nm). The introduction of dopants allows one to control the optical properties of samples, which then can be used to create effec...
Article
The generation of terahertz (THz) radiation during the propagation of subpicosecond pulses in liquid media is investigated using a theoretical model considering the relative contribution of Kerr and plasma nonlinearity. The dependences of the THz emission generation efficiency on the contribution of plasma nonlinearity with a fixed third-order nonl...
Article
Full-text available
By irradiating a water jet with double pulses, we demonstrate 4-fold higher THz wave generation than for a single pump pulse. The dependence of the enhanced THz signal on the temporal delay between two collinear pulses reveals the optimal time for launching signal pulse is near 2-4 ps, which corresponds to the time needed to create the complete pre...
Preprint
Full-text available
The development of multiplexing information transmission technology in the THz band may accelerate the arrival of the 6G era. In this paper, has demonstrated the feasibility of forming a sequence of subpulses in the temporal domain and the corresponding quasidiscrete spectrum in the THz frequency range. It is shown that despite the fact that the TH...
Article
Full-text available
Abstract Time-resolved terahertz spectroscopy has become a common method both for fundamental and applied studies focused on improving the quality of human life. However, the issue of finding materials applicable in these systems is still relevant. One of the appropriate solution is 2D materials. Here, we demonstrate the transmission properties of...
Article
We investigated data denoising in hyperspectral terahertz pulse time-domain holography. Using the block-matching algorithms adapted for spatio-temporal and spatio-spectral volumetric data we studied and optimized parameters of these algorithms to improve phase image reconstruction quality. We propose a sequential application of the two algorithms o...
Article
Full-text available
Modern sources of THz radiation generate high-intensity pulses allowing to observe nonlinear effects in this spectral range. To describe many nonlinear effects theoretically, it is necessary to know the nonlinear refractive index coefficient of optical materials. The work studies the applicability of the Z-scan method to determine the nonlinear ref...
Article
Full-text available
Polar liquids are strong absorbers of electromagnetic waves in the terahertz range, therefore, historically such liquids have not been considered as good candidates for terahertz sources. However, flowing liquid medium has explicit advantages, such as a higher damage threshold compared to solid-state sources and more efficient ionization process co...
Article
Full-text available
In modern optical fiber transmission systems, an important aspect is the temporal multiplexing of channels. Guided-wave optical technologies for creating communication lines with a terahertz repetition rate come to the fore. In this paper, the methods of numerical simulation have illustrated the possibility of forming a sequence of subpulses with a...
Article
Full-text available
The values of the nonlinear refractive index coefficient for various materials in the terahertz frequency range exceed the ones in both visible and NIR ranges by several orders of magnitude. This allows to create nonlinear switches, modulators, systems requiring lower control energies in the terahertz frequency range. We report the direct measureme...
Preprint
Full-text available
Polar liquids are strong absorbers of electromagnetic waves in the terahertz range, therefore, historically such liquids have not been considered as good candidates for terahertz sources. However, flowing liquid medium has explicit advantages, such as a higher damage threshold compared to solid-state sources and more efficient ionization process co...
Preprint
Full-text available
The values of the nonlinear refractive index coefficient for various materials in the terahertz frequency range exceed the ones in both visible and NIR ranges by several orders of magnitude. We report the direct measurement of the nonlinear refractive index coefficient of liquid water by using the Z-scan method with broadband pulsed THz beam. Our e...
Conference Paper
Full-text available
We measured n2 of liquid water in THz range by using the Z-scan method. The measured n2 is 3.5×10-10 cm2/W which is six orders higher than the values for VIS and NIR spectral ranges.
Conference Paper
We report the nonlinear optical generation of broadband terahertz (THz) waves from liquids by using laser induced micro-plasma under the excitation of asymmetric optical fields. Additionally, we demonstrated that a water line is a better THz source than a water film under comparable experimental condition.
Article
Full-text available
A modification of the Z-scan technique for measuring nonlinear refractive index n2 in the terahertz spectral region is proposed. Measurements are made at a broadband terahertz radiation intensity of 0.8 × 10⁹ W cm⁻². Coefficient n2 = 2.5 × 10⁻¹¹ cm² W⁻¹ is estimated for semiconductor crystalline ZnSe.
Article
A modified Z-scan method for determining the nonlinear refractive index of colloidal quantum dots in the near-IR spectral range in the resonant excitation mode is proposed. It is demonstrated that the thermal effects related to heating of the solution due to strong light absorption can be mitigated by reducing the probing pulse repetition rate. The...
Article
Understanding the physics of terahertz (THz) wave generation from water is essential for developing liquid THz sources. This letter reports detailed experimental measurements of THz wave emission by focusing intense laser pulses onto water films. The simulation based on a ponderomotive force-induced dipole is supported by the observation of the THz...
Article
Full-text available
We used a numerical simulation to calculate the coherence time of the spectral supercontinuum generated in a microstructured fiber in which the group velocity dispersion as a function of wavelength and pump pulse width has two zeros. We determined the contribution to the total coherence time from each of the separate substructures in the resulting...
Article
Full-text available
In this paper we present results of experimental study of two-photon absorption (2PA) induced in electro-optical crystals ZnTe and ZnSe by intensive optical radiation in 450? 950 nm wavelength range. These crystals are of interest due to common usage in THz systems. Femtosecond pump-probe spectroscopy with the supercontinuum source helps to induce...
Article
Full-text available
We present the results of our experimental investigation of the transmission of plates of zinc-selenide crystal doped with iron at a level of 0.23 mass % in the terahertz-frequency range and compare them with the transmission of undoped samples. We show that the presence of iron impurities in a zinc-selenide sample makes the medium more transparent...
Article
Full-text available
Luminescent molecules attached to resonant colloidal particles are an important tool to study light-matter interaction. A traditional approach to enhance the photoluminescence intensity of the luminescent molecules in such conjugates is to incorporate spacer-coated plasmonic nanoantennas, where the spacer prevents intense non-radiative decay of the...
Article
Full-text available
The optical clearing method has been widely used for different spectral ranges where it provides tissue transparency. In this work, we observed the enhanced penetration of the terahertz waves inside biological samples (skin, kidney, and cornea) treated with glycerol solutions inducing changes of optical and dielectric properties. It was supported b...
Article
A method of ultrafast wireless information transmission using spectrum-sliced supercontinuum (SC) along the THz frequency range is presented in this manuscript. The THz spectrum-sliced SC was formed by femtosecond optical pulses doubled in a Michelson interferometer before being input onto a MgO:LiNbO3 THz generator. Two THz pulses generated by fem...
Article
Full-text available
The application of optoelectronic techniques to the generation and detection of THz radiation is now well established. Wide gap semiconductor crystals of groups II-VI, III-V and III-VI are abundantly used. However, some limitations are occurred while using powerful laser systems. In this paper we introduce experimental results of two-photon absorpt...
Conference Paper
Full-text available
Hybrid halide perovskites have emerged as one of the most promising type of materials for thin-film photovoltaic and light-emitting devices. Further boosting their performance is critically important for commercialization. Here we use femtosecond laser for post-processing of organo-metalic perovskite (MAPbI3) films. The high throughput laser approa...
Article
Full-text available
Recently, hybrid halide perovskites have emerged as one of the most promising types of materials for thin-film photovoltaic and light-emitting devices because of their low-cost and potential for high efficiency. Further boosting their performance without detrimentally increasing the complexity of the architecture is critically important for commerc...
Article
We have performed the first theoretical and experimental studies of the production of a femtosecond spectral supercontinuum in a deuterium-oxide (D2O) jet. When pumped by laser pulses with an incoming central wavelength of 800 nm, width of 40 fs, and maximum intensity of 8.8 × 10¹³ W∕cm², the supercontinuum spectrum generated in a 1.8-mm thick jet...
Article
Full-text available
Experimental and numerical modeling techniques demonstrated the possibilities of the spectral-time encoding and decoding for time division multiplexing sequence of femtosecond subpulses with a repetition rate of up to 6.4 THz. The sequence was formed as a result of the interference of two phase-modulated pulses. We report the limits of the applicat...
Article
Nonlinear refractive indices of simple and composite chalcogenide glasses with gold nanoparticles are measured by the Z-scan method using a femtosecond Ti:sapphire laser with a central wavelength of 800 nm and a pulse duration of 40 fs. It is shown that introduction of nanoparticles into thin layers of amorphous GeS2, As30Ge20S50, and As3Ge35S62 le...