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Ushakova E.V.,National Research University of Informational Technologies | Litvin A.P.,National Research University of Informational Technologies | Parfenov P.S.,National Research University of Informational Technologies | Fedorov A.V.,National Research University of Informational Technologies | And 4 more authors.
ACS Nano | Year: 2012

We report on an anomalous size dependence of the room-temperature photoluminescence decay time from the lowest-energy state of PbS quantum dots in colloidal solution, which was found using the transient luminescence spectroscopy. The observed 10-fold reduction in the decay time (from ∼2.5 to 0.25 μs) with the increase in the quantum dots' diameter is explained by the existence of phonon-induced transitions between the in-gap state-whose energy drastically depends on the diameter-and the fundamental state of the quantum dots. © 2012 American Chemical Society.


Orlova A.O.,National Research University of Informational Technologies | Gromova Yu.A.,National Research University of Informational Technologies | Maslov V.G.,National Research University of Informational Technologies | Prudnikau A.V.,Belarusian State University | And 3 more authors.
Journal of Applied Physics | Year: 2013

We prepared hybrid structures based on CdSe/ZnS quantum dots and organic azo-dyes and porphyrin molecules embedded into polymer track pore membranes. The quenching of the quantum dot's photoluminescence and the shortening of its decay time, accompanied in the latter case by a porphyrin sensitized photoluminescence, present a clear evidence of the efficient energy transfer in these structures. The proposed quantum-dot/azo-dyes and quantum-dot/porphyrin structures can be used in different microfluidic systems for, e.g., sensing of metal ions or efficient singlet oxygen generation. © 2013 AIP Publishing LLC.


Kostyuk G.K.,National Research University of Informational Technologies | Sergeev M.M.,National Research University of Informational Technologies | Antropova T.V.,RAS Institute of Chemistry | Yakovlev E.B.,National Research University of Informational Technologies | Anfimova I.N.,RAS Institute of Chemistry
Glass Physics and Chemistry | Year: 2013

The process of the formation of microregions (MRs) in the volume of alkaline-borosilicate glasses using the method which includes the production of porous glass (PG) by leaching two-phase alkaline-borosilicate glass in acid and the action on PG of laser radiation of a wavelength practically not absorbed by glass has been studied. The optical properties of MRs and the possibility of their preservation after PG sintering in a furnace to obtain a quartzoid glass are studied. © 2013 Pleiades Publishing, Ltd.


Grishkanich A.,National Research University of Informational Technologies | Zhevlakov A.,National Research University of Informational Technologies | Kascheev S.,National Research University of Informational Technologies | Kujanpaa V.,Lappeenranta University of Technology | Savinainen T.,VTT Technical Research Center of Finland
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

The optical attachment for transformation the spatial characteristics of excimer laser has been experimentally investigated. The laser beam of rectangular section with sizes of 3 x 20 mm and divergence of 2 x 5 mrad after passage of an optical attachment got the square form 20 . 20 mm and equal divergence of 5 . 5 mrad orthogonal directions. It is shown, that application of such unit in the facilities for microprocessing of materials simplifies an optical path of illumination module, allows to receive the optimum uniformity of irradiation (within 2 %) at reproductive image with micron accuracy in plane of processed material and to mitigate the beam load on optical elements due to suppression of influence of ";hot"; points. © 2016 SPIE.


Yegorov D.I.,National Research University of Informational Technologies | Tsyganok E.A.,National Research University of Informational Technologies
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The article is devoted to problems of research and development of hyper-chromatic lenses for optical coherence tomography. The article discusses the possibility of developing hyper-chromatic lenses for a given spectral range made of glasses only. It is proposed to use the kinoform as the main power element of lens. There are shown the results of the analysis of the aberration properties of kinoform, as well as conclusions about the impossibility of its use as a single component of hyper-chromatic lens. There are shown the formulas for calculating the overall characteristics of a kinoform. The study also considered the method of calculation of hybrid lens consisting of a kinoform and lens parts. The article gives examples of hybrid lenses developed with the main characteristics and overall quality characteristics. © 2015 SPIE.


Grishkanich A.S.,National Research University of Informational Technologies | Elizarov V.V.,National Research University of Informational Technologies | Kascheev S.V.,National Research University of Informational Technologies | Zhevlakov A.P.,National Research University of Informational Technologies | Sidorov I.S.,University of Eastern Finland
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

One of the highly effective methods of operative remote environmental monitoring on land and water surfaces is laser sensing. It knew that the Raman scattering cross section is very small (10-25-10-27), so in some cases radiation back into captivity to the target could be a few tens of photons. For high-speed sensing, speed of processing and ease of use lidar units required for the use of appropriate hardware and software systems used for the decision of tasks of collecting, processing, storing, organizing large amounts of data. © 2015 SPIE.


Aryslanova E.M.,National Research University of Informational Technologies | Alfimov A.V.,National Research University of Informational Technologies | Chivilikhin S.A.,National Research University of Informational Technologies
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2013

Artificially on the surface of aluminum there may be build a thick layer of Al2O3, which has a porous structure. In this paper we present a model of growth of porous alumina in the initial stage of anodizing, identifying dependencies anodizing parameters on the rate of growth of the film and the distance between the pores and as a result of the created model equations were found for changes in the disturbance of alumina for the initial stage of anodizing aluminum oxide porous border aluminum-alumina and alumina-electrolyte, with the influence of surface diffusion of aluminum oxide. © 2013 SPIE.


Egorov D.I.,National Research University of Informational Technologies | Tsyganok E.A.,National Research University of Informational Technologies
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

The article investigates the possibility of using diffractive optical elements on an example of the kinoform in the optical coherence tomography (OCT). The article gives a brief overview of modern methods of research in the OCT, the expediency of development hyperchromatic lenses for spectral OCT systems. The authors made the aberration analysis of diffractive optical element (DOE), conducted a review of its application, and the DOE proposed to use in the example of a kinoform as the main force component of the hyperchromatic lens. In conclusion, the article provides examples of developed hybrid lenses for two spectral ranges, lens transmittance analysis and the assessment of their adaptability. © 2016 SPIE.


Parfenov P.S.,National Research University of Informational Technologies | Litvin A.P.,National Research University of Informational Technologies | Ushakova E.V.,National Research University of Informational Technologies | Fedorov A.V.,National Research University of Informational Technologies | And 2 more authors.
Review of Scientific Instruments | Year: 2013

We describe an experimental setup for the characterization of luminescence from nanostructures. The setup is intended for steady-state and time-resolved luminescence measurements in the near-infrared region. The setup allows us to study spectral luminescence properties in the spectral range of 0.8-2.0 μm with high spectral resolution and kinetic luminescence properties between 0.8 and 1.7 μm with a time resolution of 3 ns. The capabilities of the system are illustrated by taking luminescence measurements from PbS quantum dots. We established the size dependencies of the optical properties of the PbS quantum dots over a wide spectral range. Finally, the energy transfer process was studied with a high temporal and spectral resolution. © 2013 AIP Publishing LLC.


PubMed | National Research University of Informational Technologies
Type: Journal Article | Journal: The Review of scientific instruments | Year: 2013

We describe an experimental setup for the characterization of luminescence from nanostructures. The setup is intended for steady-state and time-resolved luminescence measurements in the near-infrared region. The setup allows us to study spectral luminescence properties in the spectral range of 0.8-2.0 m with high spectral resolution and kinetic luminescence properties between 0.8 and 1.7 m with a time resolution of 3 ns. The capabilities of the system are illustrated by taking luminescence measurements from PbS quantum dots. We established the size dependencies of the optical properties of the PbS quantum dots over a wide spectral range. Finally, the energy transfer process was studied with a high temporal and spectral resolution.

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