Bulletin of the Russian Academy of Sciences: Physics最新文献

{"title":"Polymer Dendrite Assisted Fabrication of Lasing Structures","authors":"E. V. Bodyago,&nbsp;D. S. Gets,&nbsp;S. V. Makarov","doi":"10.1134/S1062873825714862","DOIUrl":"10.1134/S1062873825714862","url":null,"abstract":"<p>The development of new synthetic approaches for realization of high-quality perovskite nanocrystals is one of perspective research directions. Generally, synthetic approaches require complex apparatus and precise parameter control to achieve high quality nanocrystals. Therefore, searching for low cost and simple approaches for fabrication of fine perovskite nanocrystals capable of demonstrating resonant properties such as lasing is one of the most difficult but promising research directions. In our approach we use polymer dendrites that offer high structural and geometrical reproducibility by growing in periodic structures. This reproducibility and periodicity can be used for fabrication of various resonant photonic structures confined inside dendrites. In our study, we demonstrate that bunches of high-quality perovskite nanocrystals can be grown inside polymer dendrites. Obtained perovskite nanocrystals preserve strict geometrical form typical for growth methods like chemical vapor deposition or solution assisted nucleation. Obtained perovskite nanocrystals under pump excitation demonstrate high-quality single mode lasing with narrow laser line.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S509 - S513"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of Optical and Photoemission Properties of Triple Cation Perovskite Films","authors":"A. Y. Sokolova,&nbsp;V. L. Kalinichenko,&nbsp;A. D. Furasova","doi":"10.1134/S1062873825714928","DOIUrl":"10.1134/S1062873825714928","url":null,"abstract":"<p>Today, perovskite thin-film electronics require specific semiconductor materials for high performance. Modern indoor perovskite solar cells can be significantly improved if the classic MAPbI₃ semiconductor is replaced by triple-cation compositions with a band gap greater than 1.6 eV. However, simply changing the anion proportion in a perovskite can lead to changes in the Goldschmidt tolerance factor and initiate phase separation. In this study, one of the most stable CsFAMAPb(IBr)₃ thin films was used to investigate new stable compositions under UV light. Here, we used six different proportions of halogens with a fixed ratio of cations in the thin films, which were experimentally tested to determine their optical and photoluminescence parameters and assess their potential for indoor photovoltaic applications.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S545 - S550"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Theoretical Modeling of Superradiant and Subradiant Photoluminescence in Pairs of Lifetime-Limited Organic Molecules","authors":"E. A. Tarasevich,&nbsp;V. D. Burova,&nbsp;M. G. Gladush","doi":"10.1134/S1062873825715016","DOIUrl":"10.1134/S1062873825715016","url":null,"abstract":"<p>We present numerical calculations of the cooperative photoluminescence spectra of two dipole–dipole–coupled dibenzoterrylene molecules embedded in an anthracene crystal at liquid-helium temperature. Using master-equation formalism for non-identical two-level emitters, we reproduce the excitation spectra recently observed in experiment. The excellent agreement between the simulations, analytical model, and measurements confirms the observation of controllable molecular entanglement and validates the theoretical framework. The approach provides an efficient computational tool for predicting and controlling cooperative photoluminescence in solid-state molecular systems. These results establish a basis for future experiments aimed at achieving optical entanglement of organic molecules and developing quantum photonic devices.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S618 - S628"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrically Controlled Optical Spectral Filter for Dense Wavelength Division Multiplexing Communication Systems Based on Chirped Multilayer Diffraction Polymer-Dispersed Liquid Crystal Structures","authors":"D. S. Rastrygin,&nbsp;D. M. Chubarov,&nbsp;Y. A. Altukhov,&nbsp;V. O. Dolgirev,&nbsp;S. N. Sharangovich","doi":"10.1134/S1062873825714849","DOIUrl":"10.1134/S1062873825714849","url":null,"abstract":"<p>We have presented a theoretical model of light diffraction on multilayer inhomogeneous holographic diffraction structures formed in polymer-dispersed nematic liquid crystals with a spatially varying period. Numerical simulation of the diffraction characteristics of such structures was performed to evaluate their performance as optical spectral filters for dense wavelength division multiplexing communication systems. The results obtained can serve as a basis for the further development of spectral filters.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S499 - S503"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Substrate-Embedded Dipole Nanoantenna Arrays: Collective Optical Response","authors":"A. V. Dyshlyuk,&nbsp;N. A. Inogamov,&nbsp;O. B. Vitrik","doi":"10.1134/S1062873825714813","DOIUrl":"10.1134/S1062873825714813","url":null,"abstract":"<p>We have studied the optical properties of a regular array of plasmonic nanoantennas in the form of subwavelength metal spherical particles partly embedded in a metal substrate with a hollow gap between the particles and the substrate. Using gold, a representative plasmonic material, for the particles and the substrate, we have demonstrated that the nanoantenna array possesses two distinct resonances, which may be tuned by varying the parameters of the individual nanoantennas and the grating period. Particular attention is given to the scenario when the two resonances overlap producing an asymmetric Fano-like resonant feature in the array’s reflection spectrum. The possibility of using the nanoantenna array under study for refractometric measurements is considered. Apart from refractometry, the results obtained in this work can find application in the development of novel nanophotonic functional elements for concentration, enhancement and redistribution of the electromagnetic field.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S479 - S486"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1062873825714813.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultraviolet and Visible Elastic III-N Microwire-Based Light-Emitting Diodes","authors":"D. Kolesina,&nbsp;F. Kochetkov,&nbsp;I. Mukhin","doi":"10.1134/S1062873825714904","DOIUrl":"10.1134/S1062873825714904","url":null,"abstract":"<p>Nanoscale ultraviolet (UV) and visible light sources are promising for applications in wearable optoelectronic, medical treatment devices and LED applications. Mercury lamps previously employed as UV sources need to be replaced by alternative environmentally friendly sources such as III-nitride-based light emitting diodes (LEDs). In this work, the first flexible UV-A and visible light emitting diodes based on AlGaN/GaN and InGaN/GaN core-shell microwires are demonstrated. The developed devices contain a composite microwire/polydimethylsiloxane membrane with flexible transparent electrodes. It is shown that single-walled carbon nanotube electrodes are preferable and provide a stable electrical contact to the membrane with a high transparency in the and visible spectral ranges. The flexible UV-A and stretchable UV-B membranes demonstrate electroluminescence around 345 and 320 nm. Applying the SWCNT-based electrodes with specific meander-shape current paths provides the stretchability and optical stability of the LED structures. The obtained results pave the way for flexible and elastic inorganic light-emitting diodes to be employed in sensing, detection of fluorescent labels or light therapy.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S534 - S539"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatial and Energy Structure of the Quantum System Indirect Exciton–Interface","authors":"V. P. Dzyuba,&nbsp;O. B. Vitrik","doi":"10.1134/S106287382571493X","DOIUrl":"10.1134/S106287382571493X","url":null,"abstract":"<p>The interaction between the electric charges of the electron and hole plays a key role in the formation of a quantum exciton states, their energy spectrum, and the exciton lifetime. In a spatially indirect exciton (IX), in which the electron and hole are separated by a transition layer this interaction directly depends on the geometric parameters of the interface–indirect exciton (IX–interface) system. In this study, the influence of the IX–interface system geometry on the energy spectrum binding of the IX is analytically investigated. It is rigorously demonstrated that the geometric parameters are quantized. The effective permittivity of the interface becomes dependent on the orbital and magnetic quantum numbers of the IX. The IX binding energy has nonlinear dependence of on the geometric parameters. Geometry shapes the fine structures of the IX states, as well as the exciton absorption, reflection, and luminescence spectra of the heterostructure. All these manifestations of geometry are accessible to experimental observation. This allows the use of the IX‒interface geometry for exciton spectroscopy of the interface layer. The geometry can be controlled by polarized light and an electric field. This allows the use of quantum geometric states of IX as qubits. Fine structures of the binding energy spectra of the ground state of IX were modeled for two planar heterostructures, SiO₂/Si₃N₄ and GaAs/CdSe. It should be noted that the obtained conclusions are valid not only for planar layered heterostructures.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S551 - S557"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced Photoluminescence in CeF3–YF3–TbF3 Colloids via Gold Nanoparticles","authors":"A. S. Nizamutdinov,&nbsp;T. M. Minnebaev,&nbsp;A. V. Astrakhantseva,&nbsp;A. K. Ginkel,&nbsp;E. A. Izbasarova,&nbsp;B. R. Murtazin,&nbsp;V. V. Semashko,&nbsp;A. M. Burov,&nbsp;N. G. Khlebtsov,&nbsp;M. S. Pudovkin","doi":"10.1134/S1062873825714977","DOIUrl":"10.1134/S1062873825714977","url":null,"abstract":"<p>The enhancement of photoluminescence in colloids represents a vital field of photonics, advancing real-world applications in lighting, sensing, and beyond. A colloidal ternary system CeF₃–YF₃–TbF₃ emits green photoluminescence (PL) under ultraviolet pulsed pumping. In this paper, we demonstrate that introducing gold nanoparticles (Au NPs) to the colloidal solution enhances PL via indirect optical transitions. Contrary to common expectations, larger Au NPs with a diameter of 95 nm exhibit a 2.5-fold enhancement in PL, whereas smaller Au NPs enabling a high-Q plasmon resonance, shows significantly less enhancement. Herein, we represent a novel mechanism for PL enhancement enabled by green PL acting as the pump source.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S586 - S594"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrical Anisotropy of Laser-Graphitized Diamond Surface","authors":"M. S. Komlenok,&nbsp;M. G. Rybin,&nbsp;V. I. Konov","doi":"10.1134/S1062873825715028","DOIUrl":"10.1134/S1062873825715028","url":null,"abstract":"<p>On the surface of diamond plate with (100) and (110) orientations the graphitized structures are created by excimer KrF laser irradiation (λ = 248 nm, τ = 20 ns). The electrical resistance of graphitized layers is measured in different directions. Anisotropy of electrical properties is discovered and studied. The obtained results open new possibilities for using laser methods to modify diamond materials and can be used to improve the conductivity of structures in new diamond-based photonic and electronic elements.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S629 - S633"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S1062873825715028.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct Laser Printing of Infrared Antireflective Laser-Induced Periodic Surface Structures on the Surface of LiInS2 Nonlinear Optical Single Crystals","authors":"S. A. Syubaev,&nbsp;L. I. Isaenko,&nbsp;D. V. Pavlov,&nbsp;A. A. Kuchmizhak","doi":"10.1134/S1062873825714874","DOIUrl":"10.1134/S1062873825714874","url":null,"abstract":"<p>The development of advanced infrared-operating optical devices is facing the problem of Fresnel reflection losses at the surface of optical components, caused by mismatch between their refractive index and that of the surrounding environment, limiting in its turn the devices’ practical efficiency. This task becomes especially challenging when designing optical systems that rely on the utilization of nonlinear optical single-crystals, typically exhibiting a rather high refractive index (<i>n</i> &gt; 2) in the near-IR spectral range with a corresponding strong index jump at the air-crystal interface and increased Fresnel losses. Unreliable methods, based on deposition of antireflection thin-film coatings onto the crystal surface, are being rapidly replaced by high-resolution, but low-performance, lithographic techniques for fabrication anti-reflective nanostructures (ARNs) directly on the surface of nonlinear optical crystals. However, direct lithography-free technologies are undoubtedly demanded to convert proof-of-concept demonstrations of broadband high-transmittance properties of ARNs into real practical applications. Here, anti-reflection relief representing laser-induced periodic surface structures (LIPSS) was fabricated on a novel and promising IR-transparent LiInS₂ (LIS) single crystals by direct femtosecond laser nanopatterning. The effects of applied laser pulse energy and scanning velocity on the morphological features (nanotrenches periodicity and height modulation amplitude) and the structural-phase composition of produced LIPSS were systematically investigated and characterized by means of scanning electron microscopy and Raman spectroscopy. Fourier-transform infrared spectroscopy revealed a 10%-increased transmittance within NIR spectral range of one-sided LIPSS-patterned LIS crystal, compared to the untreated one. This study confirms the prospects of direct laser printing as a high-performance and high-resolution technology for fabrication of anti-reflective nanostructures on the surface of functional nonlinear optical crystals, applicable in noninvasive medical diagnostics, broadband laser spectrometers, nonlinear bio- and chemosensing and so on.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"89 4","pages":"S514 - S518"},"PeriodicalIF":0.48,"publicationDate":"2026-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340571","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}