Dr. Konstantin E. Mochalov Profile

Dr. Konstantin E. Mochalov

at Moscow Engineering Physics Institute

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Publications (5)

Proceedings Article | 3 October 2019 Paper

Polariton-assisted emission of strongly coupled organic dye excitons in a tunable optical microcavity

Dmitriy Dovzhenko, Konstantin Mochalov, Ivan Vaskan, Irina Kryukova, Yury Rakovich, Igor Nabiev

Proceedings Volume 11207, 112072C (2019) https://doi.org/10.1117/12.2530257

KEYWORDS: Optical microcavities, Mirrors, Molecules, Excitons, Polaritons, Plasmonics, Luminescence, Electromagnetism, Physics, Fabry–Perot interferometers

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Proceedings Article | 18 April 2016 Presentation + Paper

Modulation of quantum dot photoluminescence in porous silicon photonic crystals as a function of the depth of their penetration

Dmitriy Dovzhenko, Igor Martynov, Pavel Samokhvalov, Konstantin Mochalov, Alexander Chistyakov, Igor Nabiev

Proceedings Volume 9885, 988507 (2016) https://doi.org/10.1117/12.2228990

KEYWORDS: Photonic crystals, Luminescence, Silicon photonics, Crystals, Optical microcavities, Silicon, Nanoparticles, Photonic crystal devices, Modulation, Quantum dots, Silicon, Silicon photonics, Crystals, Finite-difference time-domain method, Etching

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Photonic crystals doped with fluorescent nanoparticles offer a plenty of interesting applications in photonics, laser physics, and biosensing. Understanding of the mechanisms and effects of modulation of the photoluminescent properties of photonic crystals by varying the depth of nanoparticle penetration should promote targeted development of nanocrystal-doped photonic crystals with desired optical and morphological properties. Here, we have investigated the penetration of semiconductor quantum dots (QDs) into porous silicon photonic crystals and performed experimental analysis and theoretical modeling of the effects of the depth of nanoparticle penetration on the photoluminescent properties of this photonic system. For this purpose, we fabricated porous silicon microcavities with an eigenmode width not exceeding 10 nm at a wavelength of 620 nm. CdSe/CdS/ZnS QDs fluorescing at 617 nm with a quantum yield of about 70% and a width at half-height of about 40 nm were used in the study. Confocal microscopy and scanning electron microscopy were used to estimate the depth of penetration of QDs into the porous silicon structure; the photoluminescence spectra, kinetics, and angular fluorescence distribution were also analyzed. Enhancement of QD photoluminescence at the microcavity eigenmode wavelength was observed. Theoretical modeling of porous silicon photonic crystals doped with QDs was performed using the finite-difference time-domain (FDTD) approach. Theoretical modeling has predicted, and the experiments have confirmed, that even a very limited depth of nanoparticle penetration into photonic crystals, not exceeding the first Bragg mirror of the microcavity, leads to significant changes in the QD luminescence spectrum determined by the modulation of the local density of photonic states in the microcavity. At the same time, complete and uniform filling of a photonic crystal with nanoparticles does not enhance this effect, which is as strong as in the case of a very limited depth of nanoparticle penetration. Our results will help to choose the best technology for fabrication of efficient sensor systems based on porous silicon photonic crystals doped with fluorescent nanoparticles.

Proceedings Article | 22 May 2013 Paper

High-resolution 3D structural and optical analyses of hybrid or composite materials by means of scanning probe microscopy combined with the ultramicrotome technique: an example of application to engineering of liquid crystals doped with fluorescent quantum dots

Konstantin Mochalov, Anton Efimov, Alexey Yu. Bobrovsky, Igor Agapov, Anton Chistyakov, Vladimir Oleinikov, Igor Nabiev

Proceedings Volume 8767, 876708 (2013) https://doi.org/10.1117/12.2017088

KEYWORDS: Luminescence, Liquid crystals, Atomic force microscopy, Matrices, Scanning probe microscopy, 3D metrology, Polymers, 3D modeling, 3D image reconstruction, Imaging spectroscopy

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Proceedings Article | 11 October 2012 Paper

Novel cholesteric materials doped with CdSe/ZnS quantum dots with photo- and electrotunable circularly polarized emission

Konstantin Mochalov, Alexey Yu. Bobrovsky, Vladimir Oleinikov, Alyona Sukhanova, Anton Efimov, Valery Shibaev, Igor Nabiev

Proceedings Volume 8475, 847514 (2012) https://doi.org/10.1117/12.929729

KEYWORDS: Luminescence, Liquid crystals, Ultraviolet radiation, Quantum dots, Polarization, Polymers, Photon polarization, Electro optics, Transmittance, 3D image reconstruction

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Proceedings Article | 10 October 2012 Paper

Extension of the spectral range of bacteriorhodopsin functional activity by energy transfer from quantum dots

Vladimir Oleinikov, Nicolas Bouchonville, Alyona Sukhanova, Michael Molinari, Svetlana Sizova, Konstantin Mochalov, Anton Chistyakov, Evgeniy Lukashev, Aliaksandra Rakovich, John Donegan, Igor Nabiev

Proceedings Volume 8464, 84640Z (2012) https://doi.org/10.1117/12.929764

KEYWORDS: Fluorescence resonance energy transfer, Promethium, Phase modulation, Quantum dots, Energy transfer, Solar energy, Nanocrystals, Molecules, Luminescence, Absorption

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