Персона: Самохвалов, Павел Сергеевич
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Инженерно-физический институт биомедицины
Цель ИФИБ и стратегия развития – это подготовка высококвалифицированных кадров на базе передовых исследований и разработок новых перспективных методов и материалов в области инженерно-физической биомедицины. Занятие лидерских позиций в биомедицинских технологиях XXI века и внедрение их в образовательный процесс, что отвечает решению практикоориентированной задачи мирового уровня – диагностике и терапии на клеточном уровне социально-значимых заболеваний человека.
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- ПубликацияОткрытый доступОПТИМИЗАЦИЯ УСЛОВИЙ СИНТЕЗА НАНОКРИСТАЛЛОВ InP С ИСПОЛЬЗОВАНИЕМ ТРИС-АМИНОФОСФИНОВ В КАЧЕСТВЕ ПРЕКУРСОРОВ ФОСФОРА(НИЯУ МИФИ, 2025) Зарезин, Д. П.; Набиев, И. Р.; Самохвалов, П. С.; Набиев, Игорь Руфаилович; Самохвалов, Павел Сергеевич; Зарезин, Данил ПетровичФлуоресцентные полупроводниковые квантовые точки (КТ) из фосфида индия (InP) являются перспективной малотоксичной альтернативой квантовым точкам на основе халькогенидов кадмия. Предполагается, что при достижении сравнимых оптических характеристик КТ состава InP смогут успешно вытеснить Cd-содержащие нанокристаллы из традиционных областей их применений в оптоэлектронике и биомедицине. К сожалению, в настоящее время оптические параметры квантовых точек InP уступают параметрам их Cd-содержащих аналогов, а методики их получения требуют дополнительной оптимизации. В настоящей работе представлены результаты экспериментов по оптимизации процедур синтеза КТ состава InP c использованием трис-диэтиламинофосфина в качестве прекурсора фосфора. Показано, что оптимизация режимов нагрева реакционных смесей при синтезе, как и использование обезвоженных реагентов, позволяет получать высокогомогенные КТ состава InP с улучшенными оптическими характеристиками.
- ПубликацияТолько метаданныеDetermination of the Single-Exciton Two-Photon Absorption Cross Sections of Semiconductor Nanocrystals through the Measurement of Saturation of Their Two-Photon-Excited Photoluminescence(2020) Karaulov, A.; Krivenkov, V.; Samokhvalov, P.; Dyagileva, D.; Nabiev, I.; Самохвалов, Павел Сергеевич; Набиев, Игорь Руфаилович© 2020 American Chemical Society.Conventional approaches to the determination of the two-photon absorption cross-section (TPACS) of fluorescent semiconductor nanocrystals, including quantum dots (QDs) and nanoplatelets (NPLs), cannot be applied to samples with unknown concentrations and low optical densities and may be inaccurate in the case of multiexciton nanocrystal excitation. Here, we have studied the two-photon-excited photoluminescence saturation in QD and NPL samples and propose a novel technique for determining of their TPACS from the parameters of this process. The technique allows the measurement of the TPACSs of single exciton states in the samples of unknown concentration, as well as in thin films with ultralow optical densities. The calculated values agreed with the results obtained by conventional methods. The new technique paves new ways to studying small amounts of fluorescent nanocrystals of unknown quantity under two-photon excitation.
- ПубликацияТолько метаданныеOptical Properties of Composites based on CsPbBr3 Perovskite Nanocrystals and Polymer Matrices as Promising Components of Next-generation Scintillation Detectors(2023) Knysh, A.; Sosnovtsev, V.; Gulevich, D.; Samokhvalov, P. S.; Кныш, Александр Александрович; Сосновцев, Валерий Витальевич; Гулевич, Даяна Галимовна; Самохвалов, Павел Сергеевич
- ПубликацияТолько метаданныеPrinciples of Chemical Designing of Styrene-Based Plastic Scintillators Doped with Quantum Dots(2024) Knysh, A.; Kirsanov, M.; Sosnovtsev, V.; Nabiev, I.; Samokhvalov, P.; Кныш, Александр Александрович; Кирсанов, Михаил Алексеевич; Сосновцев, Валерий Витальевич; Набиев, Игорь Руфаилович; Самохвалов, Павел Сергеевич
- ПубликацияТолько метаданныеEnhanced fluorescence emission of a single quantum dot in a porous silicon photonic crystal-plasmonic hybrid resonator(2024) Granizo, E.; Kriukova, I.; Samokhvalov, P.; Nabiev, I.; Гранисо Роман, Эвелин Алехандра; Крюкова, Ирина Сергеевна; Самохвалов, Павел Сергеевич; Набиев, Игорь РуфаиловичAbstract Currently, much interest is attracted to investigating the potential of hybrid systems that exhibit plasmon-induced photoluminescence (PL) enhancement of quantum emitters in terms of optoelectronics and biosensing applications. The implementation of these systems based on photonic microcavities offers benefits due to a stronger localization of the field within the resonant cavity. Porous silicon is one of interesting materials for engineering such microcavities thanks to the simplicity of its fabrication and the possibility to embed emitters from the solution into a ready-made resonator. In this theoretical study, the fluorescence enhancement of a quantum dot (QD) in a hybrid system based on a porous silicon microcavity (pSiMC) and silver nanoplatelets (AgNPs) was investigated using finite element method (FEM) numerical simulations. For this purpose, infinite arrays were simulated by using a periodic unit cell. The pSiMC was designed as two Ћ? /4 distributed Bragg reflectors with alternating refractive indices and a cavity layer of a double thickness between them. For comparison, simulations were also performed for an AgNP and a QD in a reference monolayer with a constant refractive index without a microcavity structure. The results show QD fluorescence enhancement in the AgNP/pSiMC hybrid system, mainly due to the higher excitation rate.
- ПубликацияТолько метаданныеMicrofluidics and Nanofluidics in Strong Light–Matter Coupling Systems(2024) Granizo, E.; Kriukova, I.; Escudero-Villa, P.; Samokhvalov, P.; Nabiev, I.; Гранисо Роман, Эвелин Алехандра; Крюкова, Ирина Сергеевна; Самохвалов, Павел Сергеевич; Набиев, Игорь РуфаиловичThe combination of micro- or nanofluidics and strong light-matter coupling has gained much interest in the past decade, which has led to the development of advanced systems and devices with numerous potential applications in different fields, such as chemistry, biosensing, and material science. Strong light-matter coupling is achieved by placing a dipole (e.g., an atom or a molecule) into a confined electromagnetic field, with molecular transitions being in resonance with the field and the coupling strength exceeding the average dissipation rate. Despite intense research and encouraging results in this field, some challenges still need to be overcome, related to the fabrication of nano- and microscale optical cavities, stability, scaling up and production, sensitivity, signal-to-noise ratio, and real-time control and monitoring. The goal of this paper is to summarize recent developments in micro- and nanofluidic systems employing strong light-matter coupling. An overview of various methods and techniques used to achieve strong light-matter coupling in micro- or nanofluidic systems is presented, preceded by a brief outline of the fundamentals of strong light-matter coupling and optofluidics operating in the strong coupling regime. The potential applications of these integrated systems in sensing, optofluidics, and quantum technologies are explored. The challenges and prospects in this rapidly developing field are discussed.
- ПубликацияТолько метаданныеConjugates of ultrasmall quantum dots and acridine derivatives as prospective nanoprobes for intracellular investigations(2021) Laronze-Cochard, M.; Sapi, J.; Karaulov, A.; Linkov, P.; Samokhvalov, P.; Baryshnikova, M.; Nabiev, I.; Самохвалов, Павел Сергеевич; Барышникова, Мария Анатольевна; Набиев, Игорь Руфаилович© 2021 by the authors. Licensee MDPI, Basel, Switzerland.Designing nanoprobes in which quantum dots (QDs) are used as photoluminescent labels is an especially promising line of research due to their possible medical applications ranging from disease diagnosis to drug delivery. In spite of the significant progress made in designing such nanoprobes, the properties of their individual components, i.e., photoluminescent QDs, vectorization moieties, and pharmacological agents, still require further optimization to enhance the efficiency of diagnostic or therapeutic procedures. Here, we have developed a method of engineering compact multifunctional nanoprobes based on functional components with optimized properties: bright photoluminescence of CdSe/ZnS (core/shell) QDs, a compact and effective antitumor agent (an acridine derivative), and direct conjugation of the components via electrostatic interaction, which provides a final hydrodynamic diameter of nanoprobes smaller than 15 nm. Due to the possibility of conjugating various biomolecules with hydroxyl and carboxyl moieties to QDs, the method represents a versatile approach to the biomarker-recognizing molecule imaging of the delivery of the active substance as part of compact nanoprobes.
- ПубликацияТолько метаданныеStrong coupling effects in a plexciton system of gold nanostars and J-aggregates(2022) Melnikau, D.; Sanchez-Iglesias, A.; Grzelczak, M.; Rakovich, Y. P.; Samokhvalov, P.; Nabiev, I.; Самохвалов, Павел Сергеевич; Набиев, Игорь Руфаилович© 2021Strong exciton–plasmon interaction enables effective control of the photonic properties of hybrid organic–inorganic nanostructures encompassing light absorption, scattering and luminescence. Whereas the manifestations of light-matter interactions in the absorption and scattering are reasonably well understood their relation to the luminescence as well as luminescence properties themselves in strongly coupled plexcitonic hybrids is still largely underexplored especially for a system with a complex mechanism of hybridisation of states. Here we report on investigation of the interaction between localized and hybridized plasmons in gold nanostars and excitons in J-aggregates under ambient conditions. Our findings demonstrate the quality performance of the formed plexciton system with multiple hybridization channels in terms of the parameters of strong coupling, such as Rabi splitting (230 meV), coupling-strength-to-transition energy ratio (0.07), and cooperativity (2.03). The results of time-resolved experiments elucidate the observed enhanced spontaneous emission rate with regard to the Purcell effect, whose value was estimated from the extinction spectra of the strongly coupled plexciton system.
- ПубликацияТолько метаданныеTunable Fabry–Perot Microcavity Based on Boron Nitride and Rhodamine 6G(2023) Granizo, E. A.; Samokhvalov, P. S.; Nabiev, I. R.; Гранисо Роман, Эвелин Алехандра; Самохвалов, Павел Сергеевич; Набиев, Игорь Руфаилович
- ПубликацияТолько метаданныеA nano-hybrid plasmon-exciton material with an enhanced biexciton emission increases the efficiency of the photodetector at high excitation intensities(2022) Rakovich, Y.; Krivenkov, V.; Samokhvalov, P.; Martynov, I. L.; Nabiev, I.; Самохвалов, Павел Сергеевич; Мартынов, Игорь Леонидович; Набиев, Игорь Руфаилович© 2022 SPIE.Semiconductor quantum dots (QDs) have a wide absorption spectrum spreading from UV to the visible region and high photoluminescence (PL) quantum yield (QY) what determine possible use of their films for re-emitting coatings enhancing the photodetector spectral range. Unlike fluorescent organic dyes, the QDs absorption doesn't saturate at high excitation intensities and can absorb more than one photon per particle due to the biexciton generation. However, due to the high rate of the Auger nonradiative relaxation, the QDs biexciton PL QY is much lower than the single-exciton one, what reduces the overall PL QY and the photodetector photosensitivity at the high excitation intensities. An employment of the Purcell effect in the plasmon nanocavities should increase the biexciton PL QY thus overcoming this limitation. To use this effect, we designed a thin-film plasmon-exciton material containing QDs and silver nanoplates (SNPs) in which the QDs' PL band and the SNPs' absorption band are overlapped. To demonstrate the advantage of the designed (QD-SNP)-film, we have compared effects of QD-film and (QD-SNP)-film on the photoresponse of the Si-based photodetector. The response of a photodetector to pulse excitation at 266 nm was negligible and increased after the deposition of the QD-film on its surface. However, at the high excitation intensities, the photosignal was reduced due to the biexcitons formation. The addition of SNPs increased the photoresponse at high excitation intensities. We attribute this improvement to a strong enhancement of QD biexciton PL in the QD-SNP material, which became predominate at high excitation intensities.