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Whispering gallery mode selection in quantum dot microdisk lasers under spatially inhomogeneous optical pumping
Journal of Lightwave Technology. 2025. Vol. 43. No. 15. P. 7278–7284.
Anna Obraztsova, Ivan Makhov, Ivan Melnichenko, Konstantin Ivanov, Natalia Kryzhanovskaya, Alexey Zhukov
Spectral characteristics of quantum dot (QD) microdisk lasers under spatially inhomogeneous optical excitation are
investigated. By varying the position and size of the continuous wave excitation spot over the laser cavity, we demonstrate controllable selection and switching of lasing whispering gallery modes (WGMs) at room temperature. Experimental results show that shifting the excitation spot across the surface of 10 μm microdisk laser enables reversible wavelength switching between WGMs at 1285 nm and 1313 nm, corresponding to different radial mode
orders. Theoretical modeling and near-field scanning optical microscopy confirm that the observed spectral switching of lasing WGM is caused by spatially selective charge carrier distribution arising from the suppressed lateral transport of charge carriers in quantum dot active region. The findings highlight the potential for actively spectral switchable microlasers for applications in photonic integration and optical sensing.
Dmitriev A., Kornilov V., Batienkov R., Lecture Notes in Civil Engineering 2026 Vol. 886 P. 249–255
Numerous studies have provided compelling evidence that the probability distribution of avalanche sizes follows a power law, and that 1/f noise is present in the stochastic dynamics of landslides. We present a theoretical explanation of these phenomena within the framework of self-organized criticality theory, proposing a discrete-time model in the form of a sandpile cellular ...
Added: October 13, 2026
Dmitriev A., Shulman I., Lebedev A., Studies in Computational Intelligence 2026 Vol. 1265 P. 266–273
A discrete-time model is presented for the self-organization of the X/Twitter social network to the edge of a phase transition, characterized by avalanche-like propagation of information in the network. The model is based on the analogy between the critical dynamics of the X social network and sandpile cellular automata with Manna rule on the Chung-Lu ...
Added: October 13, 2026
Arutyunov K., Kharitonov I. A., Petrosyants K. O., JETP Letters 2026 Vol. 124 No. 6 P. 1–16
Superconducting properties of metallic micro- and nanowires can be entirely different from those of bulk superconductors. Of particular interest is the nonequilibrium current-induced state of a quasi-one-dimensional superconducting channel. The most interesting phenomenon here is the stepped I–V characteristic, explained by a process known as phase slip center activation. If the origin of such step-like ...
Added: October 13, 2026
Makarov D. M., Kalikin N., Fashchevsky K. A. et al., Electrochimica Acta 2026 Vol. 579 Article 150159
Machine learning (ML) has become a powerful tool for accelerating the development of carbon-based supercapacitors;
however, most published models assume that a single predictive framework can describe both conventional
porous carbons and hybrid carbon electrodes. Here, we test this assumption using a comprehensive
benchmark dataset and an extended literature-curated dataset enriched with synthesis- and electrolyte-related
descriptors. Three ML algorithms ...
Added: October 13, 2026
Махлуф М., Ozhegov R., Elezov M. et al., Фотоника 2026 Vol. 20 No. 6 P. 414–423
This paper compares the ranging precision of direct time-of-flight (dToF) and non-line-of-sight (NLOS) LiDAR architectures, both using a superconducting nanowire single-photon detector (SNSPD). Both systems operate at 1550 nm with a 50 ps pulsed laser and time-correlated single-photon counting (TCSPC). The dToF configuration achieved approximately 100 µm precision at 10 m, while the NLOS configuration achieved 500 µm precision for ...
Added: October 12, 2026
Singapore: Springer, 2026.
This volume presents the Proceedings of the 34th IUPAP Conference on Computational Physics (CCP2023), held in Kobe, Japan on August 4–8, 2023. It offers a collection of peer-reviewed articles that highlight recent developments in computational and simulation research across various areas of physics. Key topics include the use of data science, quantum computing, and machine ...
Added: October 12, 2026
Goncharov A., Chibisov A., Advanced Theory and Simulations 2023 Vol. 12 No. 13 Article 2200816
Designing stable quantum computers with the ability to correct errors responsibly requires a detailed understanding of the physical processes that underlie these devices. In this study, detailed quantum mechanical simulations of the atomic structure, charge distribution of electron density, and distribution and orientation of magnetic and quantum states as a function of applied external pressure ...
Added: October 11, 2026
Chibisov A., Gnidenko A., Chibisova M. et al., FlatChem 2023 Vol. 41 Article 100533
Manufacturing precise quantum computers with small errors in quantum operations, long coherence times, and low power consumption is the most important challenge in modern nanoelectronics. To understand the operating modes of such calculators in detail, both the optimal arrangement of the qubit system within the structure and changes in its magnetic properties must be comprehensively ...
Added: October 11, 2026
Ivanov K., Fedosov I. S., Войтович В. И. et al., Письма в Журнал технической физики 2026 Т. 52 № 12 С. 53–58
The paper presents the model of a microdisk laser – photonic crystal defect waveguide coupling system. Different finite dimensions of photonic crystals are taken into account. It is shown that coupling to a photonic crystal waveguide allows to increase the output power while maintain quality factor, which is not what a traditional coupling to a ...
Added: June 4, 2026
Fedosov I. S., Fominykh N., Kryzhanovskaya N. et al., Физика и техника полупроводников 2025 Т. 59 № 7 С. 388–391
The power and spectral characteristics of the radiation of a semiconductor microdisk laser with a diameter of 40 µm, monolithically integrated with an optical waveguide, have been studied. To reduce absorption in the waveguide, current pumping was used. In the light–current dependence, features associated with the onset of generation at a longer-wavelength resonance are observed. ...
Added: February 27, 2026
Fedosov I. S., Fominykh N., Kryzhanovskaya N. et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2025 Vol. 18 No. 3.2 P. 200–204
We investigate the mode composition of a microdisk laser coupled with an optical waveguide. The output spectra of emission and light-current characteristic of the microlaser obtained from the output edge of the waveguide are studied. The microlaser demonstrates single-mode emission in consecutive ranges of injection currents, that are alternated with pronounced mode hoping. The intensity ...
Added: January 12, 2026
D.A. Masyutin, A.A. Rudnev, E.I. Moiseev et al., St. Petersburg Polytechnical University Journal: Physics and Mathematics 2025 Vol. 18 No. 3.1 P. 125–128
In this work, we present results on high-temperature operation microdisk lasers with an active region based on InGaN/GaN quantum wells. The diameter of the microdisks was 5 μm. The photoluminescence spectra measured in the temperature range from 25 °С to 100 °С. The temperature stability lasing is demonstrated. ...
Added: December 11, 2025
Natalia V. Kryzhanovskaya, Sergey D. Komarov, Eduard I. Moiseev et al., IEEE Photonics Technology Letters 2026 Vol. 38 No. 4 P. 243–246
III-N ring microlasers on a silicon substrate with InGaN/GaN active layers emitting near 420 nm were investigated. The growth conditions and fabrication steps were optimized to realize stable lasing under optical pumping in cavities with a diameter of 6-10 um. Chemically sensitive transmission electron microscopy images indicate that InGaN layers present in form of isolated ...
Added: November 18, 2025
Konstantin A. Ivanov, Alexey E. Zhukov, Eduard I. Moiseev et al., Journal of Applied Physics 2025 Vol. 138 No. 10 Article 103104
Microlasers supporting whispering gallery modes attract great interest because of their potential use in photonic integrated circuits: they have size just an order of magnitude larger than their emission wavelength and exhibit good thermal and dynamic properties. It is usually assumed that in disk microlasers a whispering gallery mode of the highest azimuthal order and ...
Added: September 11, 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
Moiseev E., Komarov S., Ivanov K. et al., Письма в Журнал технической физики 2025 Т. 51 № 11 С. 41–45
Созданы микродисковые лазеры с использованием полупроводниковой структуры InGaN/GaN на подложке Si. Продемонстрирована лазерная генерация при комнатной температуре в микролазерах диаметром 5−8 μm, работающих при оптической накачке в импульсном режиме на модах шепчущей галереи. Продемонстрирован сдвиг длины волны генерации от 406 до 425 nm за счет уменьшения оптических потерь лазера при увеличении его диаметра в пределах ...
Added: May 19, 2025
Бабичев А. В., Makhov I., Kryzhanovskaya N. et al., Письма в Журнал технической физики 2025 Т. 51 № 5 С. 41–44
Представлены результаты исследования расщепления мод шепчущей галереи в лазерах спектрального диапазона 930-950 nm на основе вертикального микрорезонатора. Использование распределенных брэгговских отражателей на основе чередующихся слоев Al0.2Ga0.8As/Al0.9Ga0.1As, не поглощающих на длине волны накачного лазера, позволило снизить величину пороговой мощности оптической накачки до 180 μW (для 3 μm-микролазера). Добротность микрорезонатора на пороге генерации для мод шепчущей галереи ...
Added: April 30, 2025
Balakirev S. V., Makhov I., Kirichenko D. V. et al., Optical Materials 2025 Vol. 163 Article 116964
We reveal a strong dependence of optical properties of InAs quantum dots (QDs) on the As/Ga flux ratio used
during the overgrowth with a low-temperature GaAs layer. Evaluating various characteristics of the photoluminescence
spectra, we determine an optimal As/Ga flux ratio which allows formation of QDs emitting at the
longest wavelengths, with the highest intensity and the largest ...
Added: April 17, 2025
Babichev A., Makhov I., Kryzhanovskaya N. et al., IEEE Journal on Selected Topics in Quantum Electronics 2025 Vol. 31 No. 2 Article 1502808
We report on microlasers based on high-quality micropillars with whispering-gallery modes lasing. The use of lowabsorbing Al0.2Ga0.8As/Al0.9Ga0.1As distributed Bragg reflectors and smooth pillar sidewalls enables whispering-gallery modes lasing by excitation and collection of emission in the pillar axis direction. Simultaneous whispering gallery modes lasing (comblike structure) is observed in the wavelength range of 930–970 nm ...
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
Natalia V. Kryzhanovskaya, Eduard I. Moiseev, Alexey M. Nadtochiy et al., IEEE Journal on Selected Topics in Quantum Electronics 2025 Vol. 31 No. 2 Article 1501312
Technological progress makes it possible to significantly reduce the size of semiconductor laser emitters to microscales and sizes commensurate with the emission wavelength. Extreme laser miniaturization can be achieved using disk or ring resonators supporting high-Q whispering gallery modes (WGM). WGMlasers are interesting not only due to small sizes (small mode volume) but also for ...
Added: September 10, 2024
Balakirev S., Alexey Nadtochiy, Natalia Kryzhanovskaya et al., Journal of Luminescence 2024 Vol. 272 Article 120621
The results of a study of the optical properties of self-assembled InAs/GaAs (001) quantum dots (QDs) overgrown under different arsenic pressures, obtained using photoluminescence (PL) and PL excitation spectroscopy, are presented. If the arsenic pressure during overgrowth is low (2.5·10−6 Pa), a series of pronounced QD-related peaks is observed in the 77-K PL spectrum over a ...
Added: May 20, 2024
Makhov I., Ivanov K., Moiseev E. et al., Nanomaterials 2023 Vol. 13 No. 5 Article 877
One-state and two-state lasing is investigated experimentally and through numerical simulation
as a function of temperature in microdisk lasers with Stranski–Krastanow InAs/InGaAs/GaAs
quantum dots. Near room temperature, the temperature-induced increment of the ground-state
threshold current density is relatively weak and can be described by a characteristic temperature
of about 150 K. At elevated temperatures, a faster (super-exponential) increase in ...
Added: April 25, 2023
Миньков К. Н., Данилин А. Н., Шитиков А. Е. et al., Оптический журнал 2022 Т. 89 № 11 С. 76–83
Предмет исследования. Оригинальный метод обработки поверхности высокодобротных кристаллических оптических микрорезонаторов c модами типа шепчущей галереи путем химикомеханической полировки на примере микрорезонаторов из фторида магния с возможностью использования метода как для хрупких, так и для мягких материалов. Цель работы заключалась в разработке нового эффективного метода обработки поверхности кристаллических микрорезонаторов c модами типа шепчущей галереи, основанного на асимптотической химикомеханической полировке. Метод. Изготовленные ...
Added: October 24, 2022