Ismagilov Azat
@itmo.ru
ITMO University
EDUCATION
2013-2019: ITMO University
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Vladimir S. Shumigai, Egor N. Oparin, Aleksey V. Chernykh, Azat O. Ismagilov, Nikolay V. Petrov, Boris A. Nasedkin, Alexey A. Kalinichev, and Anton N. Tsypkin
Elsevier BV
Nikolay V. Petrov, Azat O. Ismagilov, Egor N. Oparin, Vladimir S. Shumigai, Anastasiia K. Lappo-Danilevskaia, Boris A. Nasedkin, and Anton N. Tsypkin
SPIE
Azat Ismagilov, Anastasia Lappo-Danilevskaya, Aleksey Kalinichev, and Anton Tcypkin
Optica Publishing Group
Boris Nasedkin, Fedor Kiselev, Ilya Filipov, Darya Tolochko, Azat Ismagilov, Vladimir Chistiakov, Andrei Gaidash, Anton Tcypkin, Anton Kozubov, and Vladimir Egorov
American Physical Society (APS)
Aleksandra Nabilkova, Azat Ismagilov, Maksim Melnik, Anton Tsypkin, Mikhail Guselnikov, Sergei Kozlov, and Xi-Cheng Zhang
Optica Publishing Group
To create self-controlled radiation photonics systems, it is necessary to have complete information about the nonlinear properties of the materials used. In this Letter, the vibrational mechanism of the giant low-inertia cubic nonlinearity of the refractive index of water in the terahertz (THz) frequency range is experimentally proven. Its dominance, which manifests itself when the temperature of the liquid changes, is demonstrated. The measured nonlinear refractive index in the THz frequency range for a water jet at temperatures from 14°C to 21°C demonstrates a correlation with the theoretical approach, varies in the range 4–10 × 10−10 cm2/W, and is characterized by an inertial time constant of less than 1 ps.
Anton Tcypkin, Evgenia Ponomareva, and Azat Ismagilov
WORLD SCIENTIFIC
Anastasiia V. Sokolova, Nikita V. Tepliakov, Azat O. Ismagilov, Danila A. Tatarinov, Alexey A. Kalinichev, Aleksandra V. Koroleva, Evgeniy V. Zhizhin, Mikhail A. Baranov, Elena V. Ushakova, and Aleksandr P. Litvin
American Chemical Society (ACS)
Ilya Artser, Maksim Melnik, Azat Ismagilov, Mikhail Guselnikov, Anton Tcypkin, and Sergei Kozlov
Springer Science and Business Media LLC
AbstractHigh-intensity optical radiation propagation in a transparent dielectric medium causes the phenomena of pulse self-action and radiation generation at triple frequencies due to the cubic nonlinearity of the medium. However, quadratic nonlinear effects usually outshine the cubic ones in anisotropic nonlinear crystals. In this work, we demonstrate that for certain experimental parameters the nonlinear effect of the third order can be stronger than the second order one in the MgO:$$\\hbox {LiNbO}_3$$ LiNbO 3 crystal for terahertz frequency range. We experimentally and theoretically show that this effect can lead to the significant modification of the classical phenomenon of radiation generation at triple frequencies in the case when the pulse represents only one complete oscillation of the optical field. The experiment demonstrated that the phenomenon of generation of radiation at triple frequencies with respect to the frequency of the maximum spectral density in a nonlinear medium of the pulse disappears, and it is replaced by the generation of radiation at quadruple frequencies. The analysis confirms that this effect is based on the asymmetry and large width of the initial spectrum of such extremely short pulses in terms of the number of oscillations.
Ivan D. Skurlov, Anastasiia V. Sokolova, Danila A. Tatarinov, Peter S. Parfenov, Danil A. Kurshanov, Azat O. Ismagilov, Aleksandra V. Koroleva, Denis V. Danilov, Evgeniy V. Zhizhin, Sergey V. Mikushev,et al.
MDPI AG
Lead halide perovskite nanoplatelets (NPls) attract significant attention due to their exceptional and tunable optical properties. Doping is a versatile strategy for modifying and improving the optical properties of colloidal nanostructures. However, the protocols for B-site doping have been rarely reported for 2D perovskite NPls. In this work, we investigated the post-synthetic treatment of CsPbBr3 NPls with different Cd2+ sources. We show that the interplay between Cd2+ precursor, NPl concentrations, and ligands determines the kinetics of the doping process. Optimization of the treatment allows for the boosting of linear and nonlinear optical properties of CsPbBr3 NPls via doping or/and surface passivation. At a moderate doping level, both the photoluminescence quantum yield and two-photon absorption cross section increase dramatically. The developed protocols of post-synthetic treatment with Cd2+ facilitate further utilization of perovskite NPls in nonlinear optics, photonics, and lightning.
M. V. Arkhipov, A. N. Tsypkin, M. O. Zhukova, A. O. Ismagilov, A. V. Pakhomov, N. N. Rosanov, R. M. Arkhipov, O. Chekeres, A. S. Losev, P. Mnev,et al.
Pleiades Publishing Ltd
An Erratum to this paper has been published: https://doi.org/10.1134/S002136402234001X
B. A. Nasedkin, I. M. Filipov, A. O. Ismagilov, V. V. Chistiakov, F. D. Kiselev, A. N. Tsypkin, and V. I. Egorov
Allerton Press
Azat Ismagilov, Anastasia Lappo-Danilevskaya, Yaroslav Grachev, Boris Nasedkin, Victor Zalipaev, Nikolay V. Petrov, and Anton Tcypkin
Optica Publishing Group
A method is proposed for accelerating measurements for ghost imaging reconstruction of objects using spectral multiplexing of speckle patterns formed by broadband terahertz (THz) radiation. The presented method aims at the challenge of a sufficiently large number of measurements, and increases the correlation between reference and reconstructed images. It is experimentally shown that unique speckle patterns for individual frequencies can be formed by broadband THz radiation while propagating through a random phase plate. It is shown by numerical simulation that these speckle patterns can be used to decrease the number of diffusers required by more than one order compared to the integrated method. The possibility of using electro-optical detection in the proposed technique reduces the number of measurements. For example, for the spectral range from 0.2 to 1.2 THz, there is a more than 20-fold decrease in the number of diffusers used.
Alexandra O. Nabilkova, Maria O. Zhukova, Maksim V. Melnik, Azat O. Ismagilov, Vladimir P. Chegnov, Olga I. Chegnova, and Anton N. Tcypkin
Springer Science and Business Media LLC
E.N. Oparin, V.S. Shumigay, A.O. Ismagilov, and A.N. Tsypkin
ITMO University
Julia Burunkova, George Alkhalil, Anton Tcypkin, Sergey Putilin, Azat Ismagilov, Sandor Molnar, Lajos Daroczi, and Sandor Kokenyesi
Wiley
V. Zalipaev, L. Leibov, A. Ismagilov, B. Nasedkin, N. Petrov, and A. Tcypkin
IEEE
Computational aspects of ghost imaging diffraction modelling based on broadband terahertz pulsed radiation, modulated by a random phase screen, are discussed. An image generated by transmission of an incident Gauss-Hermite beam passing through a 2D inhomogeneous thin film is the main subject of our study. The modelling is performed in both the frequency and the time domains. The quality of the reconstructed images of a set of slots of different size is analysed for various modes of the incident Gauss-Hermite beams.
B.A. Nasedkin, D.A. Tolochko, I.M. Filipov, V.V. Chistiakov, A.O. Ismagilov, F. D. Kiselev, A. N. Tcypkin, and V.I. Egorov
IEEE
In this work, we measured transmission spectra of fiber-optic elements, which are used as countermeasures against quantum hacking in the 1500 - 2000 nm range. We found that investigated fiber-optic elements transmit light in 1800 - 2000 nm which opens possibilities for realization of trojan-horse attack on quantum key distribution systems at this range. To solve that problem, we suggest a simple way to decrease transmission in long-wavelength range.
E.V. Ushakova, A.V. Sokolova, A. O. Ismagilov, D.A. Tatarinov, A.A. Kalinichev, A.V. Koroleva, E.V. Zhizhin, M.A. Baranov, and A.P. Litvin
IEEE
All-inorganic lead halide perovskite nanocrystals doped with ytterbium demonstrate dual-band emission with visible band tunable by halide ratio change. Both visible and near infrared emissions can be excited via two-photon absorption by the perovskite matrix. It should be noted that the energy transfer from the perovskite matrix to the $\\text{Yb}^{3+}$ center is nonlinear and depends on temperature and excitation power.
A.O. Ismagilov, A. K. Lappo-Danilevskaya, Y. V. Grachev, L. S. Leibov, B. A. Nasedkin, V. V. Zalipaev, O. A. Tcypkina, N. V. Petrov, and A. N. Tcypkin
IEEE
Speckle structures formed by the propagation of broadband pulsed terahertz radiation through the transparent plate with random phase inhomogeneity were numerically and experimentally confirmed. The possibility of utilizing formed speckle structures and reduction of required measurements due to spectral multiplexing for the implementation of the ghost imaging technique has been demonstrated by the methods of numerical modeling.
Ivan D. Skurlov, Wenxu Yin, Azat O. Ismagilov, Anton N. Tcypkin, Haohang Hua, Haibo Wang, Xiaoyu Zhang, Aleksandr P. Litvin, and Weitao Zheng
MDPI AG
Metal halide perovskite nanocrystals (NCs) attract much attention for light-emitting applications due to their exceptional optical properties. More recently, perovskite NCs have begun to be considered a promising material for nonlinear optical applications. Numerous strategies have recently been developed to improve the properties of metal halide perovskite NCs. Among them, B-site doping is one of the most promising ways to enhance their brightness and stability. However, there is a lack of study of the influence of B-site doping on the nonlinear optical properties of inorganic perovskite NCs. Here, we demonstrate that Cd2+ doping simultaneously improves both the linear (higher photoluminescence quantum yield, larger exciton binding energy, reduced trap states density, and faster radiative recombination) and nonlinear (higher two- and three-photon absorption cross-sections) optical properties of CsPbBr3 NCs. Cd2+ doping results in a two-photon absorption cross-section, reaching 2.6 × 106 Goeppert-Mayer (GM), which is among the highest reported for CsPbBr3 NCs.
M. V. Arkhipov, A. N. Tsypkin, M. O. Zhukova, A. O. Ismagilov, A. V. Pakhomov, N. N. Rosanov, and R. M. Arkhipov
Pleiades Publishing Ltd
E. Ponomareva, A. Ismagilov, S. Putilin, and A. N. Tcypkin
AIP Publishing
Lev Leibov, Azat Ismagilov, Victor Zalipaev, Boris Nasedkin, Yaroslav Grachev, Nikolay Petrov, and Anton Tcypkin
Springer Science and Business Media LLC
AbstractSpeckle patterns can be very promising for many applications due to their unique properties. This paper presents the possibility of numerically and experimentally formation of speckle patterns using broadband THz radiation. Strong dependence of the statistical parameters of speckles, such as size and sharpness on the parameters of the diffuser are demonstrated: the correlation length and the mean square deviation of the phase surface inhomogeneity. As the surface correlation length is increasing, the speckle size also increases and its sharpness goes down. Alternatively, the magnification of the standard deviation of the surface height leads to the speckle size diminishing and growth of the speckle sharpness. The dimensions of the experimentally formed speckles correspond to the results of numerical simulation. The possibility of utilizing formed speckle patterns for the implementation of the ghost imaging technique has been demonstrated by methods of numerical modeling.
Evgenia A. Ponomareva, Azat O. Ismagilov, Sergey E. Putilin, Anton N. Tsypkin, Sergei A. Kozlov, and Xi-Cheng Zhang
Springer Science and Business Media LLC
AbstractLaser-driven nonlinear phenomena can both reveal the structural features of materials and become the basis for the development of various translated technologies, including highly intense terahertz sources. Here we realize a modified single-color double-pulse excitation scheme for enhancing the terahertz wave generation in flat liquid jets, and we show that the pre-ionization effect is crucial for finding the optimal input conditions. The experimental results, being supported by numerical simulations, reveal the preference for longer pre-pulses to induce the effective ionization process and shorter signals for the strong laser-plasma interaction. In addition to the identified features of the terahertz wave energy enhancement with respect to the duration change for both pulses and their ratio variation, we state the possibility of achieving the optical-to-THz conversion efficiency value up to 0.1% in the case of double-pulse excitation of an α-pinene jet.
Lev S Leibov, Victor V Zalipaev, Azat O Ismagilov, Boris A Nasedkin, Nikolai V Petrov, Alexey A Kalinichev, and Anton N Tcypkin
IOP Publishing
We present mathematical and computer modelling of ghost imaging technique based on broadband pulsed radiation of terahertz spectrum range, modulated by a random phase screen. The modelling is performed in both frequency and time domains. The quality of the reconstructed images is discussed and estimated.