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Design of broadband terahertz vector and vortex beams: I. Review of materials and components

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Light(Advanced manufacturing) 2022年第4期3卷 126-144页

作者： Nikolay v.Petrov Bogdan Sokolenko maksim S.Kulya Andrei Gorodetsky aleksey v.Chernykh Digital and Display Holography Laboratory ITMO UniversitySt.Petersburg 197101Russia v.I.vernadsky Crimean Federal University Simferopol 295007Russia School of Physics and Astronomy University of BirminghamBirmingham B152TTUK

In this paper,we review the existing approaches for vortex and vector beam shaping and generation in the terahertz frequency *** particular focus of this review is on the possibility of homogeneous topological charge formation in the ultra-wide spectral interval inherent to ultrashort terahertz *** review the available materials and components,analyse proposed and potentially possible solutions for broadband terahertz vortex and vector beam shaping,compare all developed approaches,and put forward a unified concept for constructing passive shapers of such beams from the existing component base.

关键词： Terahertz radiation vortex beams vector beams Achromatic wave plates Broadband terahertz radiation Digital holography Terahertz holography Total internal reflection Metasurface THz liquid crystals Geometric phase

Synthesis of Ag/Ag<sub>2</sub>S Nanoclusters Resistive Switches for Memory Cells

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Advances in Nanoparticles 2014年第1期3卷 1-4页

作者： aleksey Nikolaevich Belov Olga veniaminovna Pyatilova maksim Igorevich vorobiev National Research University of Electronic Technology Zelenograd Russia

Resistive switching Ag/Ag2S nanoclusters were formed by sulphidation of melting-dispersed thin and continuous Ag films. The morphology, structure and electrical properties of the prepared clusters were characterized by scanning (SEM), transmitting electron (TEM), scanning resistance microscopes (SRM) and Raman scattering. Hysteretic resistive switching behavior was observed in the samples that were studied with ON/OFF switching voltage equal to 8 - 10 v respectively. Simple empirical numerical simulation model, based on Deal-Grove model assumptions and mechanisms, for silver nanoclusters sulphidation process, was proposed.

关键词： Silver Sulphide Clusters Memory Cells Sulphidation Deal-Grove Model

Ultrafast Optomechanical Terahertz Modulators Based on Stretchable Carbon Nanotube Thin Films

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Ultrafast Science 2023年第6期3卷 1-9页

作者： maksim I.Paukov vladimir v.Starchenko Dmitry v.Krasnikov Gennady A.Komandin Yuriy G.Gladush Sergey S.Zhukov Boris P.Gorshunov Albert G.Nasibulin aleksey v.Arsenin valentyn S.volkov maria G.Burdanova Center for Photonics and 2D materials Moscow Institute of Physics and TechnologyDolgoprudny.Russia Skolkovo Institute of Science and Technology MoscowRussia Prokhorov General Physics Institute of the Russian Academy of Sciences MoscowRussia Laboratory of Advanced Functional materials Yerevan State UniversityYerevanArmenia Institute of Solid State Physics of the Russian Academy of Sciences ChernogolovkaRussia.

For terahertz wave applications,tunable and rapid modulation is highly *** studied by means of optical pump-terahertz probe spectroscopy,single-walled carbon nanotube(SWCNT)thin films demonstrated ultrafast carrier recombination lifetimes with a high relative change in the signal under optical excitation,making them promising candidates for high-speed ***,combination of SWCNT thin films and stretchable substrates facilitated studies of the SWCNT mechanical properties under strain and enabled the development of a new type of an optomechanical *** applying a certain strain to the SWCNT films,the effective sheet conductance and therefore modulation depth can be fine-tuned to optimize the designed *** exhibited a photoconductivity change of approximately 2 times of magnitude under the strain because of the structural modification in the SWCNT *** was used to control the terahertz signal with a modulation depth of around 100%without strain and 65%at a high strain operation of 40%.The sensitivity of modulators to beam polarization is also shown,which might also come in handy for the design of a stretchable *** results give a fundamental grounding for the design of high-sensitivity stretchable devices based on SWCNT films.

关键词： strain excitation films

Geochemical time series from lake sediments of the Central Asia as chronologic evidence of environmental change over the Late Holocene

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Chinese Journal Of Geochemistry 2006年第B8期25卷 6-6页

作者： Andrey v. Daryin Ivan A. Kalugin Lubov G. Smolyaninova Konstantin v. Zolotarev Elena G. vologina aleksey B. Ptitsyn Andrey A. Andreev Narantsetseg Tserendash Institute of Geology and Mineralogy SB RAS Novosibirsk Russia Budker Institute of Nuclear Physics SB RAS Novosibirsk Russia Institute of Earth Crust SB RAS Irkutsk Russia Institute of Natural Resources Ecology and Cryology SB RAS Chita Russia Alfred Wegener Institute for Polar and marine Research Potsdam Germany Institute of Geology and Mineral Resources maS Ulaanbaatar Mongolia