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  1. No Access

    Article

    Nonlinear Optical Properties of Plasmon–Exciton Nanostructures Based on PbS Quantum Dots and Gold Nanorods in the Field of Nanosecond Laser Pulses

    We present the results of our study of nonlinear optical response observed in plasmon–exciton nanostructures based on PbS quantum dots passivated with thioglycolic acid and gold nanorods under the influence of...

    A. I. Zvyagin, T. A. Chevychelova, K. S. Chirkov… in Journal of Russian Laser Research (2024)

  2. No Access

    Article

    Enhancement of Nonlinear Absorption of Nanosecond Laser Pulses in Mixtures of Ag2S Quantum Dots and Silver Nanoparticles

    The Z-scan method is used to analyze the nonlinear optical response in mixtures of colloidal Ag2S quantum dots with a diameter of 2.5 nm, passivated with thioglycolic acid, and spherical silver nanoparticles with...

    A. I. Zvyagin, T. A. Chevychelova… in Bulletin of the Lebedev Physics Institute (2023)

  3. No Access

    Article

    Luminescence of Thioglycolic Acid-Passivated PbS Quantum Dots in the Presence of Potassium Iodide

    In this paper, we discuss general trends in the IR luminescence of colloidal PbS quantum dots 3 nm in average size, capped with thioglycolic acid molecules (PbS/TGA QDs). Treatment of the PbS/TGA QDs with a KI...

    I. G. Grevtseva, K. S. Chirkov, O. V. Ovchinnikov, M. S. Smirnov in Inorganic Materials (2023)

  4. No Access

    Article

    Luminescence Transformation Mechanisms of Indocyanine Green Dye in the Presence of Gold Nanorods

    Spectral-luminescent manifestations of the plasmon-exciton interaction between gold nanorods (Au NRs) with average length and diameter of 35 ± 5 nm and 9 ± 2 nm, passivated by molecules of cetyltrimethylammoni...

    T. S. Kondratenko, T. A. Chevychelova, O. V. Ovchinnikov… in Optics and Spectroscopy (2023)

  5. No Access

    Article

    Nonlinear Optical Properties of Rose Bengal Dye in the Near Field of Silver Nanoparticles

    We discuss empirical regularities demonstrating the phenomenon of plasmon–exciton interaction in mixtures of Rose Bengal (RB) dye and spherical and pyramidal silver nanoparticles (Ag NPs and Ag NTs). We use th...

    T. S. Kondratenko, T. A. Chevychelova… in Journal of Russian Laser Research (2023)

  6. No Access

    Article

    Picosecond Dynamics Features of Electronic Excitations in Gold Nanorods

    We study the electronic excitation dynamics in ensembles of plasmonic gold nanorods (Au NRs), in view of the femtosecond transient absorption spectroscopy, and compare the results with the excitation dynamics ...

    T. A. Chevychelova, O. V. Ovchinnikov, M. S. Smirnov… in Journal of Russian Laser Research (2023)

  7. No Access

    Article

    Luminescence of Ag2S/SiO2 Colloidal Quantum Dots Decorated with Small Au Nanoparticles

    A tenfold increase in the quantum yield of defect luminescence in the region of 750 nm with a simultaneous increase in its decay time from 4 to 200 ns, due to decoration of surface of quantum dots (QDs) Ag2S/SiO2

    I. G. Grevtseva, O. V. Ovchinnikov, M. S. Smirnov… in Optics and Spectroscopy (2022)

  8. No Access

    Article

    Nonlinear Optical Properties of Colloidal PbS and Ag2S Quantum Dots Passivated with 2-Mercaptopropionic Acid

    A Z-scan study is performed of the nonlinear optical response of hydrophilic colloidal PbS and Ag2S quantum dots with average sizes of 2.2 and 2.9 nm, respectively, passivated with 2-mercaptopropionic acid (2-MPA...

    A. I. Zvyagin, T. A. Chevychelova… in Bulletin of the Russian Academy of Science… (2022)

  9. No Access

    Article

    Transformation of Trap States during the Formation of Luminescent Core/Shell Nanostructures Based on Ag2S Quantum Dots

    Results are presented from studying regularities of photoprocesses that determine the luminescence of colloidal Ag2S quantum dots during the formation of SiO2 shells. It is found that shell formation is accompani...

    A. S. Perepelitsa, O. V. Ovchinnikov… in Bulletin of the Russian Academy of Science… (2022)

  10. No Access

    Article

    Formation of Plasmon–Exciton Nanostructures upon Decorating Ag2S/SiO2 Quantum Dots with Au Nanoparticles

    The formation of plexcitonic nanostructures upon decorating the surface of Ag2S/SiO2 quantum dots with small Au nanoparticles (around 2.0 ± 0.5 nm) is confirmed spectroscopically. It is established via IR spectro...

    I. G. Grevtseva, O. V. Ovchinnikov… in Bulletin of the Russian Academy of Science… (2022)

  11. No Access

    Article

    Transient Absorption Dynamics and Nonlinear Optical Response in Colloidal Ag2S Quantum Dots

    The mechanism of the nonlinear optical response of colloidal solutions of Ag2S quantum dots passivated with thioglycolic acid molecules is considered. Appearance of nonlinear absorption and nonlinear refraction i...

    M. S. Smirnov, O. V. Ovchinnikov, A. I. Zvyagin… in Optics and Spectroscopy (2022)

  12. No Access

    Article

    Influence of Laser-Induced Destruction on Nonlinear-Optical Properties of Core/Shell Au/SiO2 Nanorods

    Mechanisms of nonlinear-optical response of an ensemble of gold nanorods covered by a shell of silicon dioxide (Au/SiO2 NRs) are analyzed. Dependences characteristic of nonlinear absorption and negative dynamic l...

    T. A. Chevychelova, A. I. Zvyagin, O. V. Ovchinnikov… in Optics and Spectroscopy (2022)

  13. No Access

    Article

    Luminescent Properties of Colloidal Ag2S Quantum Dots for Photocatalytic Applications

    The structural and optical properties of colloidal Ag2S quantum dots in different environments are studied. With the help of transmission electron microscopy, X-ray diffraction analysis, and X-ray Energy-Dispersi...

    O. V. Ovchinnikov, M. S. Smirnov, S. V. Aslanov… in Physics of the Solid State (2022)

  14. No Access

    Article

    SPECTRAL MANIFESTATIONS OF THE FORMATION OF Au/SiO2 CORE/SHELL NANOPARTICLES

    A technique for forming Au/SiO2 core/shell nanoparticles is developed. A long-wavelength shift of the extinction spectrum peak from 520 nm to 538 nm with increasing SiO2 shell thickness from a monolayer to 10 nm ...

    I. G. Grevtseva, T. A. Chevychelova… in Bulletin of the Lebedev Physics Institute (2021)

  15. No Access

    Article

    Luminescence Quantum Yield and Recombination Constants in Colloidal Core/Shell Ag2S/ZnS and Ag2S/SiO2 Quantum Dots

    The luminescence properties of colloidal Ag2S quantum dots (QDs) with ZnS or SiO2 shells coated with thioglycolic or 2-mercaptopropionic acids are comparatively analyzed. It is demonstrated that the quantum yield...

    O. V. Ovchinnikov, M. S. Smirnov, S. V. Aslanov in Optics and Spectroscopy (2020)

  16. No Access

    Article

    Nonlinear Refraction in Colloidal Silver Sulfide Quantum Dots

    We analyze the features of nonlinear refraction in colloidal solutions containing Ag2S quantum dots capped with thioglycolic acid (Ag2S/TGA) or L-cysteine (Ag2S/L-Cys), with the quantum-dot (QD) sizes ranging fro...

    A. I. Zvyagin, T. A. Chevychelova, I. G. Grevtseva… in Journal of Russian Laser Research (2020)

  17. No Access

    Article

    IR Luminescence of Polyfunctional Associates of Indocyanine Green and Ag2S Quantum Dots

    In this work, manifestations of IR luminescence sensitization of Indocyanine Green during conjugation with colloidal Ag2S quantum dots with an average size of 2.2 and 3.7 nm, passivated with thioglycolic acid mol...

    T. S. Kondratenko, M. S. Smirnov, O. V. Ovchinnikov… in Optics and Spectroscopy (2020)

  18. No Access

    Article

    Synthesis and Luminescent Properties of 3-Acyl-6,8,8,9-tetramethyl-2H-pyrano[3,2-g]hydroquinolin-2-ones

    A series of 3-R-6,8,8,9-tetramethyl-2H-pyrano[3,2-g]quinolin-2-ones was obtained by condensation of 7-hydroxy-1,2,2,4-tetramethylhydroquinoline-6-carbaldehydes with aroylacetic acid esters. The dependence of the ...

    A. Yu. Potapov, D. Yu. Vandyshev, Y. Refki… in Russian Journal of General Chemistry (2020)

  19. No Access

    Article

    Third and fifth harmonics generation in air and nanoparticle-containing plasmas using 150-kHz fiber laser

    High-pulse repetition rate lasers allow significant enhancement in the average power of the low-order harmonics generation in isotropic media. We report on the third (343-nm) and fifth (206-nm) harmonics gener...

    G. S. Boltaev, N. A. Abbasi, V. V. Kim, M. Iqbal, S. A. Khan… in Applied Physics B (2020)

  20. No Access

    Article

    Nonlinear Refraction in Colloidal Ag2S Quantum Dots

    Features of nonlinear refraction formation in colloidal solutions containing Ag2S quantum dots passivated with thioglycolic acid (Ag2S/TGA QDs) with a concentration of 0.1% and an average size of 2.0 nm are consi...

    T. S. Kondratenko, M. S. Smirnov… in Bulletin of the Lebedev Physics Institute (2019)

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