?
Thermal characteristics of III-V microlasers bonded onto silicon board
St. Petersburg Polytechnical University Journal: Physics and Mathematics. 2023. Vol. 16. No. 1.2. P. 108–113.
A.S. Dragunova, N.V. Kryzhanovskaya, F. I. Zubov, E. I. Moiseev, A.M. Nadtochiy, N.A. Fominykh, K.A. Ivanov, M.V. Maximov, Vorobyev A. A., Mozharov A. M., Kalyuzhnyy N. A., Mintairov S. A., Gordeev N. Y., Guseva Y. A., Kulagina M. M., A.E. Zhukov
In this work, we study the characteristics of semiconductor microlasers based on the heterostructure with two coupled waveguides intended to improve heat dissipation in cw regime. We analysed total output optical loss of the microlasers, their spectral characteristics, output power, emission pattern and thermal resistance. We observed that the use of the principle of two coupled resonant planar waveguides, active and passive, as well as p-side down bonding, significantly reduces the thermal resistance of microlasers and improves their performance.
Smirnov A., Kurtina D. A., Saitov S. R. et al., Optical Materials: X 2026 Vol. 30 Article 100441
Chiral semiconductor nanostructures and nanoparticles are promising materials for applications in biological sensing, enantioselective separation, photonics, and spin-polarized devices. Here we performed a detailed analysis of optical properties of chiral CdSe nanoplatelets with thickness of 2 and 3 monolayers (ML) with Nacetyl-L-cysteine ligands. We studied the absorption spectra peculiarities, analyzed time-resolved photoluminescence and investigated circular ...
Added: May 18, 2026
Smirnov A., Mantsevich V. N., Saitov S. R. et al., Journal of Applied Physics 2026 Vol. 139 Article 185702
This work presents a comprehensive investigation into the temperature-dependent thermally stimulated conductivity and photoconductivity of vacuum-annealed thin films based on core–shell CdSe/CdS nanoplatelets passivated with oleic acid ligands. Controlled thermal annealing under vacuum conditions leads to a substantial increase in both dark and photoinduced conductivity, which is primarily attributed to partial desorption of the ligands. ...
Added: May 18, 2026
Масютин Д. А., Moiseev E., Komarov S. et al., Письма в Журнал технической физики 2026 Т. 52 № 7 С. 27–30
Исследованы инжекционные полупроводниковые микролазеры с кольцевым резонатором радиусом 15 мкм с несимметричным расположением внутреннего отверстия резонатора. Показано, что асимметрия обеспечивает формирование в диаграмме направленности двух лепестков излучения, разориентированных на 50° относительно оси смещения внутреннего отверстия. Измеренная добротность резонаторов сопоставима с добротностью дисковых резонаторов и находится на уровне ∼ 10^6. ...
Added: May 18, 2026
The Journal of Physical Chemistry Letters 2026 Vol. 17 No. 18 P. 5386–5394
We demonstrate and rationalize the effect of Au nanoparticles (NPs) on the hierarchical g-C3N4/CeO2 heterojunction. g-C3N4/CeO2 decorated with monodispersed plasmonic Au NPs was synthesized. Detailed analyses showed that CeO2 nanocubes and monodispersed Au NPs were evenly distributed over the 2D g-C3N4 surface, forming a robust interface enriched with abundant active sites. The structure enabled efficient separation of photogenerated charge ...
Added: May 16, 2026
Das A., Paul R., Sharma N. et al., Colloids and Surfaces A: Physicochemical and Engineering Aspects 2026 Vol. 728 P. 138830
Niobium-doped TiO2 (Nb-TiO2), demonstrates dual functionality as an efficient photocatalyst for dye degradation and a promising photoelectrocatalyst for water oxidation. Nb incorporation via a facile hydrothermal method was confirmed by XRD (Rietveld refinement), XPS, TEM, FT-IR, Raman, and BET analyses, indicating successful lattice doping and structural modification. Photocatalytic dye degradation experiments were conducted using a model ...
Added: May 16, 2026
Kolokolov I., Lebedev V., Physical Review E - Statistical, Nonlinear, and Soft Matter Physics 2026 Vol. 113 Article 054117
We theoretically investigate the correlation functions of the phase of a light wave propagating through a
turbulent medium. We use an equation for the logarithm of a wave packet envelope, which includes a secondorder
nonlinear term. Based on this equation, we develop a diagrammatic technique to calculate corrections
to the correlation function obtained in the linear approximation. We ...
Added: May 15, 2026
Гущина В. А., / Series chemrxiv-2023-vpzhz-v2 "ChemRxiv". 2023.
All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are being intensively studied due to their unique properties and wide range of applications; however, however, the nature of their optical properties is not yet fully understood due to the difficulty of synthesis of singlephase nanoparticles. In this article we describe the features of the synthesis of single-phase particles ...
Added: May 14, 2026
Гущина В. А., Mendeleev Communications 2025 Vol. 35 No. 2 P. 193–195
All-inorganic perovskite CsPbBr3 and Cs4PbBr6 nanoparticles are intensively studied for their unique optical properties, though synthesizing single-phase nanoparticles has posed challenges. Detailed synthesis method of CsPbBr3 and Cs4PbBr6 single-phase nanoparticles and their chemical and phase analysis are described. Distinctive optical characteristics, such as photoluminescence, optical band gap and the Urbach tail region, are revealed and explained within the current ...
Added: May 14, 2026
Гущина В. А., Physics of Complex Systems, Russia 2026 Vol. 7 No. 1 P. 3–15
Heterostructures based on ZnO nanorods and CsPbBr3 nanocrystals were investigated for their potential as semiconductor SERS substrates. We found that ZnO morphology governs the efficiency of interfacial energy transfer, leading to enhanced photoluminescence under 390 nm excitation and a noticeable reduction of the bandgap in the composites. Raman analysis revealed a pronounced intensity enhancement and ...
Added: May 14, 2026
Bisnovatyi-Kogan G., Kondratyev I., Moiseenko S. G., International Journal of Modern Physics A 2025 Vol. 40 No. 7 Article 2550018
Bright transient objects in different wave bands have been discovered in recent years.
To explain these short (from ms to s), and very powerful events, different models, galactic and
extragalactic, have been considered. One of the popular models is based on the suggestion of
transformation of the magnetized plasma blob, presumably a magnetohydrodynamic (MHD)
shock wave, moving with relativistic ...
Added: May 11, 2026
Торопина О. Д., Бисноватый-Коган Г. С., Moiseenko S. G., Astronomy Reports 2025 Vol. 69 No. Suppl. 1 P. 80–90
The results of MHD simulations of supersonic astrophysical and laboratory jets in an external
poloidal magnetic field (Br,Bz) taking into account the rotation of the matter, are presented. The ejected
matter is collimated by the magnetic field, the degree of collimation and the flow structure depend on the
relation between of the magnetic field induction and the angular ...
Added: May 11, 2026
Гущина В. А., Russian Journal of Inorganic Chemistry 2024 Vol. 69 No. 6 P. 940–948
Currently, ABX3 nanoparticles (NPs) based on lead halides attract the attention due to their unique optical properties and a wide range of applications. The preparation of NPs with lead as a partial or complete replacement is particularly interesting because of the toxicity of this chemical element and most of its compounds. In this study, we propose a ...
Added: May 6, 2026
Morozov E. V., Demin A. S., Borovitskaya I. V. et al., Inorganic Materials: Applied Research 2026 Vol. 17 No. 3 P. 619–626
This article presents the results of experiments on the impact of powerful pulsed ion-plasma and
electron flows generated in the working chamber of the Plasma Focus PF-5M installation during each highvoltage
discharge on a model aluminum alloy B95. It is shown that the general characteristics of the alloy’s
damage upon exposure to pulsed flows of helium ions (HI) ...
Added: May 4, 2026
Babichev A., Makhov I., Kryzhanovskaya N. et al., IEEE Journal on Selected Topics in Quantum Electronics 2026 Vol. 32 No. 6 Article 1700208
Micropillar cavity lasers demonstrate operation up to 255 K. At this temperature, the lasing threshold and Q-factor, extracted at lasing threshold for a 4 μm diameter pillar are about 2 mW and 16800. For pillar lasers, the concept of which is based on an optical aperture, continuous-wave lasing is realized at room temperature (300 K). ...
Added: March 23, 2026
Ivan Melnichenko, Shugabaev T., Fominykh N. et al., Optics Letters 2025 Vol. 50 No. 21 P. 6819–6822
Low-temperature, plasma-free method of sol–gel SiO2 passivation coating film was applied to InGaAsN quantum well microlasers emitting in the 1.2 µm spectral range. A marked enhancement in their optical performance under optical pumping and current injection was found. For optically pumped microlasers, room-temperature lasing was achieved along with a substantial increase in photoluminescence intensity. In the case ...
Added: November 12, 2025
Zhukov A., Moiseev E., Makhov I. et al., Письма в Журнал технической физики 2025 Т. 51 № 20 С. 32–35
The dynamic characteristics of an InGaAs/GaAs quantum dot microring laser were investigated using small-signal high-frequency current modulation at 55 °C. The maximum modulation bandwidth was 3.7 GHz, and the energy consumption during optical transmission was estimated to be 4.2–6.4 pJ/bit. The temperature dependencies of the parameters affecting the speed of operation (K-factor, threshold current, current ...
Added: October 29, 2025
Образцова А. А., Пивоварова А. А., Komarov S. et al., Физика и техника полупроводников 2025 Т. 59 № 1 С. 37–42
Представлен подход к созданию микролазеров с квантовыми точками на подложках GaAs с дисковым резонатором, электрическим контактом мостикового типа и опорной мезой, сформированными методом жидкостного химического травления. Мостиковая конструкция представляет собой две соединенные подвешенной золотой балкой мезаструктуры, одна из которых является, собственно, микродисковым резонатором, а вторая служит для создания вынесенного электрического контакта. Предложенный метод открывает пути ...
Added: May 26, 2025
Зубов Ф. И., Шерняков Ю. М., Бекман А. А. et al., Письма в Журнал технической физики 2024 Т. 50 № 6 С. 23–27
Исследованы ватт-амперные характеристики полудисковых микролазеров c активной областью на основе квантовых яма-точек InGaAs/GaAs, излучающих на длине волны 1090 nm. Приборы изготовлены путем скалывания дисковых резонаторов диаметром 200 µm с шириной кольцевого контакта 10 µm. В режиме непрерывной накачки максимальная выходная мощность при 20◦C составила 110 mW, а лазерная генерация наблюдалась до 113◦C ...
Added: February 25, 2025
Makhov I., Komarov S., Fominykh N. et al., Optics Letters 2025 Vol. 50 No. 2 P. 387–390
Fabry–Perot (FP) lasers with a cavity length shorten down to 50 μm were investigated. One or two laser mirrors were
formed by focused ion beam etching. InGaAs quantum dots of high density were used as the laser active region. The
lasers operate in a pulsed regime up to at least 105°S. A comparison with lasers formed by ...
Added: January 9, 2025
I.A. Melnichenko, E.I. Moiseev, K.A. Ivanov et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2024 Vol. 17 No. 3_2 P. 212–216
The propagation of whispering gallery modes of a quantum-dot injection disk laser into a GaAs substrate has been investigated experimentally and using simulation. For a 50 μm diameter microlaser with 1.5-μm-thick Al0.4Ga0.6As claddings, the intensity of the mode leaking into the substrate can be up to 10–3 of the intensity of the laser mode in ...
Added: December 23, 2024
Moiseev E., Ivanov K., Khabibullin R. et al., Optics and Laser Technology 2025 Vol. 183 Article 112299
We demonstrate that microlasers with an anisotropic cavity (limaçon- or quadrupole-shaped) containing quantum well-dots in the active region are able to operate under continuous wave current injection at 90 °C. Deviation of the cavity shape from circular leads to the directionality of the emission in the lateral direction, while the quality factor of the structures and ...
Added: December 23, 2024
Харченко А. А., Nadtochiy A., Шерняков Ю. М. et al., Физика и техника полупроводников 2024 Т. 58 № 6 С. 313–317
The optical amplification of radiation from an external source was studied for the first time in waveguide heterostructures with an active region based on quantum well-dots. The dependence of outgoing radiation power on the pumping current was obtained in the spectral range of 990−1075 nm. Considering
the spectral dependence of the transparency current, the optical gain ...
Added: October 24, 2024
Fominykh N., Kryzhanovskaya N., Komarov S. et al., Физика и техника полупроводников 2024 Т. 58 № 2 С. 107–113
Microdisk lasers with diameters of 30 and 40 μm with an active region based on InGaAs/GaAs quantum dots laterally coupled to an optical waveguide were investigated. The microlasers and waveguides were fabricated in a single process on a single GaAs substrate. The spectral characteristics at injection currents flowing through the microlaser and/or waveguide exceeding the ...
Added: May 20, 2024
Fominykh N., Kryzhanovskaya N., Ivanov K. et al., Оптика и спектроскопия 2023 Т. 131 № 11 С. 1483–1485
Исследованы характеристики лазерной генерации микродисковых лазеров, сопряженных с оптическим волноводом и работающих в непрерывном режиме при повышенных температурах. Продемонстрированы лазерная генерация и волноводный эффект при температурах вплоть до 92.5 С. Измеренная характеристическая температура микролазеров составила 65 K в диапазоне 25-92.5 С. ...
Added: February 5, 2024