Special Issue "Photophysics of Media Doped with Nanoobjects"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (31 May 2019).

Special Issue Editor

Prof. Dr. Natalia V. Kamanina
Website1 Website2
Guest Editor
1. Vavilov State Optical Institute, Lab for Photophysics of media with nanoobjects, Kadetskaya Liniya V.O., dom.5, korpus 2, St.- Petersburg, 199053, Russia
2. Saint-Petersburg Electrotechnical University “LETI”, Prof.Popova Str., 5, St.- Petersburg, 197376, Russia
Interests: nano- and bio-technology, nanoparticles, organic and inorganic materials, liquid crystal, refractivity, coatings, laser-matter interaction
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Special Issue Information

Dear Colleagues,

The Special Issue on the “Photophysics of Media Doped with Nano-Objects” will be devoted to all aspects of photophysics process and nanotechnology approaches correlated with the organic and inorganic materials modified via the nanostructuration of their body or surfaces. The main focus is going to be centered on the use of perspective nanoobjects, such as fullerenes, carbon nanotubes, shungites, J-aggregates, Janus-nanoparticles, quantum dots, graphene oxides, DNA, etc., which can be considered as affective dopant agents to sensitize the conjugated organics, including liquid crystal ones. Moreover, the carbon nanotubes and relative nanostructures can be taken into account to modify the materials surface to increase their transparency, mechanical and wetting properties. The mechanisms responsible for the drastic change of photorefractivity, photoconductivity, etc. features of the modified nanocomposites will also be under investigation. Some innovative accent correlated with the replacement of nano-objects by bio-objects will be considered under the conditions of saving the basic matrix materials properties. As an additional, new process to develop the nanostructured solar energy elements, nonlinear absorbers, modulators, display devices, etc., will be proposed.

Prof. Natalia Vladimirovna Kamanina
Guest Editor

Manuscript Submission Information

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Keywords

  • Photophysical process in the structured composites
  • sensitization of the organics
  • structuration of the materials surfaces
  • laser-matter interaction, fullerenes, carbon nanotubes, quantum dots, shungites, graphene oxides, DNA, liquid crystals
  • refractivity, spectra, photoconductivity, mechanical and wetting properties
  • solar energy, display, biomedicine elements

Published Papers (3 papers)

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Research

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Open AccessArticle
Inhomogeneous Broadening of the Exciton Band in Optical Absorption Spectra of InP/ZnS Nanocrystals
Nanomaterials 2019, 9(5), 716; https://doi.org/10.3390/nano9050716 - 09 May 2019
Abstract
In this work, we have simulated the processes of broadening the first exciton band in optical absorption spectra (OA) for InP/ZnS ensembles of colloidal quantum dots (QDs). A phenomenological model has been proposed that takes into account the effects of the exciton–phonon interaction, [...] Read more.
In this work, we have simulated the processes of broadening the first exciton band in optical absorption spectra (OA) for InP/ZnS ensembles of colloidal quantum dots (QDs). A phenomenological model has been proposed that takes into account the effects of the exciton–phonon interaction, and allows one to analyze the influence of the static and dynamic types of atomic disorder on the temperature changes in the spectral characteristics in question. To vary the degree of static disorder in the model system, we have used a parameter δ, which characterizes the QD dispersion in size over the ensemble. We have also calculated the temperature shifts of the maxima and changes in the half-width for the exciton peaks in single nanocrystals (δ = 0), as well as for the integrated OA bands in the QD ensembles with different values of δ = 0.6–17%. The simulation results and the OA spectra data measured for InP/ZnS nanocrystals of 2.1 nm (δ = 11.1%) and 2.3 nm (δ = 17.3%), are in good mutual agreement in the temperature range of 6.5 K–RT. It has been shown that the contribution of static disorder to the observed inhomogeneous broadening of the OA bands for the QDs at room temperature exceeds 90%. The computational experiments performed indicate that the temperature shift of the maximum for the integrated OA band coincides with that for the exciton peak in a single nanocrystal. In this case, a reliable estimate of the parameters of the fundamental exciton–phonon interaction can be made. Simultaneously, the values of the specified parameters, calculated from the temperature broadening of the OA spectra, can be significantly different from the true ones due to the effects of static atomic disorder in real QD ensembles. Full article
(This article belongs to the Special Issue Photophysics of Media Doped with Nanoobjects)
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Open AccessArticle
Effects of Laser Plasma Formation on Quasi-Phase Matching of High-Order Harmonics from Nanoparticles and Atoms
Nanomaterials 2019, 9(4), 572; https://doi.org/10.3390/nano9040572 - 08 Apr 2019
Cited by 3
Abstract
The application of nanoparticles (NPs) and quasi-phase matching (QPM) each play an important role in the enhancement of high-order harmonics (HHG) of ultrashort laser pulses. We analyze various regimes of nanoparticle plasma formation for the creation conditions for maximal QPM-induced enhancement of the [...] Read more.
The application of nanoparticles (NPs) and quasi-phase matching (QPM) each play an important role in the enhancement of high-order harmonics (HHG) of ultrashort laser pulses. We analyze various regimes of nanoparticle plasma formation for the creation conditions for maximal QPM-induced enhancement of the groups of harmonics in the extreme ultraviolet (XUV). Laser plasmas were formed on the surfaces of NPs- and microparticle (MPs)-contained targets using ablation by nanosecond, picosecond, and femtosecond pulses. Different conditions of laser plasma formation (extended and perforated plasma) and variable concentrations of free electrons in these three cases of laser ablation led to modifications of QPM conditions. We demonstrate novel approaches in the optimization of QPM at the conditions of laser ablation of NPs and MPs by pulses of different durations. The formation of QPM conditions using femtosecond and picosecond heating pulses during HHG in such plasmas allowed the growth of conversion efficiency of the groups of harmonics, with the enhancement factors exceeding 25× in different ranges of XUV, contrary to less efficient QPM in the case of nanosecond pulse-induced ablation. Full article
(This article belongs to the Special Issue Photophysics of Media Doped with Nanoobjects)
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Review

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Open AccessReview
Extreme and Topological Dissipative Solitons with Structured Matter and Structured Light
Nanomaterials 2019, 9(6), 826; https://doi.org/10.3390/nano9060826 - 31 May 2019
Cited by 3
Abstract
Structuring of matter with nanoobjects allows one to generate soliton-like light bundles with extreme characteristics—temporal duration and spatial dimensions. On the other hand, structuring of light gives the possibility to form light bundles with complicated internal structure; their topology could be used for [...] Read more.
Structuring of matter with nanoobjects allows one to generate soliton-like light bundles with extreme characteristics—temporal duration and spatial dimensions. On the other hand, structuring of light gives the possibility to form light bundles with complicated internal structure; their topology could be used for information coding similar to that in self-replicating RNA molecules carrying genetic code. Here we review the both variants of structuring. In the first variant, we consider a linear molecular chain and organic film interacting resonantly with laser radiation. Demonstrated are optical bistability, switching waves, and dissipative solitons, whose sizes for molecular J-aggregates can reach the nanometer range. We also discuss some theoretical approaches to take into account multi-particle interaction and correlations between molecules. In the second variant, light structuring in large-size laser medium with saturable amplification and absorption is achieved by preparation of the initial field distribution with a number of closed and unclosed vortex lines where the field vanishes. Various types of topological solitons, parameter domains of their stability, and transformation of the solitons with slow variation of the scheme parameters are presented. Full article
(This article belongs to the Special Issue Photophysics of Media Doped with Nanoobjects)
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