检索结果-南通市图书馆

Photocurrent in the Polyfluorene Copolymer/PTCDI Heterojunction Enhanced by Reabsorption of Fluorescence Emission

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第12期42卷 1941-1947,I0009页

作者： Dmitriy A.Lypenko Alexey E.Aleksandrov artem V.dmitriev Anton A.Yakimanskiy Ilya E.Kolesnikov Tatiana G.Chulkova Alexander V.Yakimansky Alexey R.Tameev Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences 31/bld.4 Leninskiy ProspectMoscow119071Russia Institute of Macromolecular Compounds of the Russian Academy of Sciences 31 Bolshoi pr.VOSaint Petersburg199004Russia Saint Petersburg State University 7/9 Universitetskaya nab.Saint Petersburg199034Russia

Copolyfluorenes are of great interest due to their ability to form thin films with tunable optical and electrical *** this paper,copolymers of polyfluorene with electron withdrawing dicyanostilbene and dicyanophenanthrene moieties were synthesized;their thin films were characterized by electron spectroscopy,cyclic voltammetry,electrical,and photoelectrical *** mobility of charge carriers in the copolymers was measured for the first time,with the acceptor components providing balanced electron and hole mobilities of the order of 10^(-6) cm^(2)·V^(-1)·s^(-1).Photodetectors based on the copolymer/PTCDI heterojunction exhibited the photoresponse band extended into the green region due to the absorption of PTCDI and an increased photocurrent in the UV-blue absorption band of the copolymer,which is related to the absorption of photoluminescent emission of the copolymers in *** presented approach to improving the performance of a polymer-based photodetector is promising in organic optoelectronics.

关键词： Polyfluorene copolymer Perylenedicarboximide derivative Charge carrier mobility Fluorescence Photoconductivity

Four-wave mixing in a laser diode gain medium induced by the feedback from a high-Q microring resonator

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2025年第1期13卷 59-68页

作者： DARIA M.SOKOL NIKITA YU dmitriev DMITRY A.CHERMOSHENTSEV SERGEY N.KOPTYAEV ANATOLY V.MASALOV VALERY E.LOBANOV IGOR A.BILENKO artem E.SHITIKOV Russian Quantum Center Moscow Institute of Physics and Technology (MIPT) Skolkovo Institute of Science and Technology Lebedev Physical Institute Russian Academy of Sciences Faculty of Physics M.V.Lomonosov Moscow State University

Laser diodes are widely used and play a crucial role in myriad modern applications including nonlinear optics and ***,we explore the four-wave mixing effect in a laser diode gain medium induced by the feedback from the high-Q microring *** phenomenon can be observed at a laser frequency scan close to the microresonator eigenfrequency,prior to the transition of the laser diode from a free-running to a self-injection locking *** effect opens up the possibility for generation of remarkably low-noise,stable,and adjustable microwave *** provide a detailed numerical study of this phenomenon proven with experimental results and demonstrate the generation of the signals in the GHz *** obtained results reveal the stability of such regime and disclose the parameter ranges enabling to achieve ***,our findings uncover,to our knowledge,a novel laser diode operation regime and pave the way for the creation of new types of chip-scale,low-noise microwave sources,which are highly demanded for diverse applications,including telecommunication,metrology,and sensing.

关键词： Four wave mixing

Efficient Solvothermal Synthesis of Defect-Rich Cu-BTC•MOF with Enhanced Electrocatalytic Activity in Alkaline Hydrogen Evolution Reaction

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Transactions of Tianjin University 2024年第6期30卷 508-517页

作者： Maria Timofeeva Dmitry S.dmitriev Danil D.Maltsev artem A.Lobinsky Valentina V.Ivashchenko Svyatoslav A.Povarov Daria V.Dogadina Alexander S.Timin Valentin A.Milichko Vadim I.Popkov Sergei A.Shipilovskikh ITMO University St.PetersburgRussia 191002 Ioff e Institute St.PetersburgRussia 194021 Peter the Great St.Petersburg Polytechnic University St.PetersburgRussia 195251 Institut Jean Lamour Universit´E de Lorraine54000 NancyFrance

Porous metal–organic frameworks(MOFs) have been recently discovered to be efficient catalysts for energy applications and green technologies. Here, we report on a scalable catalytic platform using Cu–based MOFs for electrocatalytic alkaline hydrogen evolution reaction. First, the solvothermal synthesis of Cu–BTC MOFs(BTC = 1,3,5–benzenetricarboxylate) at 85 ℃ and a 1:60 ligand–to–solvent ratio allowed for minimizing the chemical consumption. Second, the obtained platform demonstrated enhanced electrochemical performance compared with commercially available Cu–based MOFs, with a potential of –230 versus –232 eV, logarithm of the current density of –3.6 versus –4.2 cm2, and electrochemical surface area of 75 versus 25 cm2per cm2of geometric area, respectively. Morphological and Raman analyses also revealed that the high concentration of defects in the obtained submicron Cu–BTC MOFs can contribute to their improved catalytic performance. Thus, our findings pave the way to the low–cost synthesis of energy–efficient MOF–based catalysts for hydrogen production.

关键词： Electrocatalysis Metal-organic frameworks Hydrogen evolution reaction Copper-based Solvothermal synthesis

Recent advances in laser self-injection locking to high-Q microresonators

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2023年第2期18卷 89-130页

作者： Nikita M.Kondratiev Valery E.Lobanov artem E.Shitikov Ramzil R.Galiev Dmitry A.Chermoshentsev Nikita Yu.dmitriev Andrey N.Danilin Evgeny A.Lonshakov Kirill N.Min’kov Daria M.Sokol Steevy J.Cordette Yi-Han Luo Wei Liang Junqiu Liu Igor A.Bilenko Directed Energy Research Centre Technology Innovation InstituteAbu DhabiUnited Arab Emirates Russian Quantum Center MoscowRussia Skolkovo Institute of Science and Technology SkolkovoRussia Moscow Institute of Physics and Technology DolgoprudnyMoscow RegionRussia Faculty of Physics Lomonosov Moscow State UniversityMoscowRussia Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Key Laboratory of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Hefei National Laboratory University of Science and Technology of ChinaHefei 230026China

The stabilization and manipulation of laser frequency by means of an external cavity are nearly ubiquitously used in fundamental research and laser applications. While most of the laser light transmits through the cavity, in the presence of some back-scattered light from the cavity to the laser, the self-injection locking effect can take place, which locks the laser emission frequency to the cavity mode of similar frequency. The self-injection locking leads to dramatic reduction of laser linewidth and noise. Using this approach, a common semiconductor laser locked to an ultrahigh-Q microresonator can obtain sub-Hertz linewidth, on par with state-of-the-art fiber lasers. Therefore it paves the way to manufacture high-performance semiconductor lasers with reduced footprint and cost. Moreover, with high laser power, the optical nonlinearity of the microresonator drastically changes the laser dynamics, offering routes for simultaneous pulse and frequency comb generation in the same microresonator. Particularly, integrated photonics technology, enabling components fabricated via semiconductor CMOS process, has brought increasing and extending interest to laser manufacturing using this method. In this article, we present a comprehensive tutorial on analytical and numerical methods of laser self-injection locking, as well a review of most recent theoretical and experimental achievements.

关键词： self-injection locking laser stabilization microresonator nonlinearity single-frequency lasing multi-frequency lasing

同方期刊数据库