Anton A. Starovoytov

Anton A. Starovoytov
ITMO University | SPbNRU ITMO · Center of Information Optical Technologies

PhD

About

36
Publications
1,201
Reads
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87
Citations
Additional affiliations
March 2009 - May 2021
ITMO University
Position
  • Professor (Associate)
March 2006 - present
ITMO University
Position
  • Senior Researcher
Education
June 2008 - May 2011
ITMO University
Field of study
  • optics
September 2002 - January 2008
ITMO University
Field of study
  • laser technology

Publications

Publications (36)
Article
Full-text available
Plasmonic nanolasers produce coherent light with wavelengths on a scale similar to their own or larger. In the past decade they have attracted intense interest, particularly from the emerging areas of integrated photonic circuits and biomedicine. Despite these capabilities, plasmonic nanolasers are still not completely understood, and this lack of...
Article
This study investigates the optical properties of the molecular layers of a pseudoisocyanine dye and its J-aggregates deposited on the surface of an Ag island film, which is an inhomogeneous ensemble of nanoparticles. Such a hybrid structure has an absorption that does not equal the sum of the inhomogeneously broadened plasmon resonance of nanopart...
Article
Full-text available
The photophysical properties of molecular layers on dielectric support are studied for two pyrylium compounds, characterized by the presence or absence of a long styrene fragment in a molecule. It is shown that in the absence of a styrene fragment the layer absorption spectrum is significantly broadened in comparison with the spectrum of the soluti...
Article
Full-text available
The absorption properties of molecular layer of cyanine dyes and its J-aggregates coated on the island films in the form of an inhomogeneous ensemble of silver or gold nanoparticles were studied. The different overlapping modes of layer absorption and plasmon resonance were obtained by varying the molecular length and the equivalent thickness of th...
Article
Full-text available
The problem of allocating bands of individual monomers or aggregates of the absorption spectrum of a multicomponent structure arises in the study of molecular layers or organic thin films. Not counting the concentrations of the components, the optical properties of this kind of samples are determined by the tilt of the molecules relative to the sub...
Article
Full-text available
The component composition of molecular layers of dicarbocyanine dyes of cationic type on glass is determined by the absorption spectroscopy methods. For symmetric and asymmetric molecules the component composition depends on the chemical structure of a molecule and its interaction with the substrate, which are responsible for the electron density d...
Conference Paper
The absorption and fluorescence properties of the cyanine dye embedded in nanoporous anodic alumina matrix were studied. The intramolecular rotational motion is hindered for adsorbed molecules in the nanopores and causes the increase of fluorescence decay time. Stimulated emission of sample was obtained in the long-wavelength band of the fluorescen...
Conference Paper
The optical properties of hybrid film based on plasmon Ag nanoparticles of different size and cyanine dyes with different length of conjugation chain depending on the relative position of the plasmon resonance and the absorption of organic molecules were studied. The absorption spectra of the films revealed several molecular forms, such as all-tran...
Article
The formation of the component composition of symmetric cationic cyanine dyes on glass is studied. The absorption spectra of layers of three homologous series of dyes with end heterocyclic groups of different spatial and chemical compositions are measured, and the absorption spectra of monomer components and aggregates are separated. The component...
Conference Paper
The structural photomodification of the multicomponent cyanine films was studied. The spectrum of the film shows different bands of components, formed by dye molecules. Optical properties of the films were determined by the relative concentrations of the molecular forms and their orientation angles. Laser-induced changes in the absorption spectra o...
Conference Paper
Full-text available
The equilibrium component composition of films and aqueous solutions of symmetric cyanine dye was studied by the absorption spectroscopy. Films as well as aqueous solution contain several monomeric components (different isomers) and aggregate forms (dimers and J-aggregates). The observed components are the ionic pairs. The relative concentrations o...
Article
This paper discusses the structural modification of a molecular layer of polymethine dye under the action of laser radiation. Resonance excitation of the all-trans isomer irreversibly alters the spatial orientations and relative concentrations of all the isomeric and aggregated species of the molecules present in the composition of the layer. The i...
Conference Paper
We investigate the structural changes induced in molecular layers of dicarbocyanine by single pulse laser radiation. The successive resonance excitation of all-trans isomer causes changes of the spatial orientation and relative concentration of the different molecular forms. The dependences of relative concentration on the total energy density of t...
Conference Paper
Photonic properties and photoinduced transformations of hybrid materials comprising silver nanoparticles and polymethine dye layers were studied. Granular films were obtained via thermal evaporation of Ag on transparent substrates in a vacuum. Polymethine dye was spin-coated over the Ag films. The samples were characterized by optical spectroscopy,...
Conference Paper
Full-text available
It was found that the absorption spectra of thin films of cyanine molecules are considerably broader than spectra of their solutions. This is because the equilibrium solutions of molecules contain all-trans isomers as major component, whereas their layers contain several monomeric (all-trans and cis isomers) and associated (dimers and J aggregates)...
Conference Paper
Optical properties of supported silver nanoparticles with cyanine dyes overlayers were investigated. The spectrum of the hybrid material was treated as a result of mutual interactions between the plasmon oscillations in the metal nanoparticles and resonance absorption and refraction of dye molecules. The spectral positions of the plasmon resonances...
Article
Full-text available
The structural properties of polymethine molecules incorporated into nanofibers of chrysotile asbestos have been studied by absorption-spectroscopy methods. These experiments have shown that, in chrysotile nanotubes, monomeric, all-trans- and cis-isomers, dimers and J aggregates can be observed. Upon incorporation of a dye from weakly concentrated...
Article
We study the component composition of cyanine dye layers on different substrates (glass, mica, and sapphire) by the absorption spectroscopy. We found that the molecular layer contains isomers of the molecules being coated and aggregated components (dimers and J-aggregates). The relative concentrations of the components depend on the structure of dy...
Article
Using the example of layers of symmetric polymethine dyes, we have studied the optical excitation energy transfer processes between nanocomponents of a molecular layer. The fluorescence yields and life-times of excited states of monomeric stereoisomers have been estimated, and the stereoisomerization yields have been determined. We show that the ex...
Article
Molecular layers of polymethine dyes on glass substrates have been investigated. As the surface concentration of molecules increases, the number of cis isomers of various structures decreases, and the relative concentration of all-trans isomers increases. The increased electron-donorability of the end groups and the lengthening of the conjugation c...
Article
We study the concentration dependences for the absorption spectra and component composition of molecular layers from three homologous series of symmetric polymethine dyes of different electron-donating ability of their terminal heterocyclic groups. We find that a change in the layer thickness leads to a change in the width and position of the spect...
Article
The reversible and irreversible structural transformations of monomolecular and associated nanocomponents of a polymethine dye layer by photoexcitation or heating are studied experimentally. The photo- and thermodestruction yields of the layers are investigated.
Article
Layers of carbocyanine polymethine dyes were studied to evaluate the effect exerted by the molecular structure and thickness of a layer on its component composition. Thin layers contain cis-monomers of different structure as major form. The number of types of cis-isomers decreases and the relative concentration of the all-trans isomers increases wi...
Article
The effect exerted by temperature and time of heating and by a resonance photoexcitation on the relative concentration of the molecular components of a dicarbocyanine polymethine dye layer, the rate of variation of the orientation angle of components and its limiting value was studied. The model of the thermally and photo-induced rearrangement of t...

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