PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)最新文献_第2页

Generation of terahertz radiation in antennas based on epitaxial films of semiconductors and topological insulators 基于半导体外延膜和拓扑绝缘体的天线中太赫兹辐射的产生

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0054924

K. Kuznetsov, P. Kuznetsov, G. Galiev, G. Kitaeva

{"title":"Generation of terahertz radiation in antennas based on epitaxial films of semiconductors and topological insulators","authors":"K. Kuznetsov, P. Kuznetsov, G. Galiev, G. Kitaeva","doi":"10.1063/5.0054924","DOIUrl":"https://doi.org/10.1063/5.0054924","url":null,"abstract":"The terahertz (THz) wave generation by photoconductive antennas fabricated on the low-temperature and high- temperature grown In0.5Ga0.5As semiconductor and Bi2-xSbxTe3-ySey (BSTS) topological insulator films is studied by the terahertz time-domain spectroscopy method. THz generation property of In0.5Ga0.5As layers grown by molecular beam epitaxy on GaAs substrates with (100) and (111)A crystallographic orientations is compared with THz generation capability of the BSTS films grown by the MOCVD method on a sapphire substrate. Antennas of the both types were excited by radiation of Er3+ -fiber laser at 1.56 um wavelength. THz generation by InGaAs-based antennas on (111)A GaAs substrates was 3–4 times more effective than the same antennas fabricated on the (100) wafers. It was found that the generation of THz waves was more efficient in an island film of BSTS having a total thickness of about tens nanometers with that chemical composition where the volume contribution to conductivity was suppressed. Strong amplification of the THz radiation power has been demonstrated after applying an external electric field to the topological insulator film.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122864149","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}

引用次数: 0

Conversion of electromagnetic wave into propagating plasmon in a periodic graphene structure 在周期性石墨烯结构中电磁波向传播等离子体的转换

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0054952

D. Fateev, I. M. Moiseenko, K. Mashinsky, V. Popov

引用次数: 1

Terahertz photoresponse of meander-patterned graphene 曲线形石墨烯的太赫兹光响应

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0054940

Y. Vasilyev, S. Novikov

引用次数: 0

Ultrafast dynamics of the magneto-optical Kerr effect in multilayer TbCo/FeCo structures under the influence of femtosecond optical excitation 飞秒光激发下多层TbCo/FeCo结构磁光Kerr效应的超快动力学

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0054910

M. Gaponov, S. Ovcharenko, N. Ilyin

{"title":"Ultrafast dynamics of the magneto-optical Kerr effect in multilayer TbCo/FeCo structures under the influence of femtosecond optical excitation","authors":"M. Gaponov, S. Ovcharenko, N. Ilyin","doi":"10.1063/5.0054910","DOIUrl":"https://doi.org/10.1063/5.0054910","url":null,"abstract":"Dynamics of the magneto-optical Kerr effect in a multilayer TbCo2 / FeCo metal structure consisting of alternating layers 1.5 nm thick was studied in this work. The relaxation process was considered over a time interval of up to 170 ps using the femtosecond pump-probe spectroscopy. The experiment was carried out in 2 geometries, when the external field was along the “easy” axis and along the “heavy” axis. The maximum value of the applied magnetic field along the «easy axis» was 4.5 kOe, and along the «heavy» axis 5 kOe. Based on the approximation of the dynamics of the Kerr effect, the dependences of the oscillation frequency, amplitude and decay time are obtained. It is shown that in the geometry of the “heavy axis”, in contrast to the geometry of the “easy axis”, the amplitude of the oscillations is several times larger, and the decay of the precession is several times slower. The dependence of the amplitude of oscillations in the “heavy axis” geometry has a maximum at an external field of about 2 kOe, the value of which is close to the saturation field along this axis.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114791499","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}

引用次数: 0

THz surface emission from bulk and monolayer WSe2 块状和单层WSe2的太赫兹表面发射

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0055455

D. Khusyainov, A. Gorbatova, A. Buryakov, E. Mishina

引用次数: 2

Preface: International Congress on Graphene, 2D Materials and Applications 2D Materials 2019 前言:2019年石墨烯、二维材料及应用国际大会

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/12.0004940

VolkovValentyn, NikitinAlexey, V. ArseninAleksey

引用次数: 0

WS2 nanotubes dressed in gold and silver: Synthesis, optoelectronic properties, and NO2 sensing 金和银修饰WS2纳米管:合成、光电特性和NO2传感

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0055823

A. Polyakov, L. Yadgarov, V. Lebedev, R. Chumakov, L. Yashina, M. Rumyantseva, R. Tenne, E. Goodilin

{"title":"WS2 nanotubes dressed in gold and silver: Synthesis, optoelectronic properties, and NO2 sensing","authors":"A. Polyakov, L. Yadgarov, V. Lebedev, R. Chumakov, L. Yashina, M. Rumyantseva, R. Tenne, E. Goodilin","doi":"10.1063/5.0055823","DOIUrl":"https://doi.org/10.1063/5.0055823","url":null,"abstract":"This conference contribution is focused on decoration of WS2 nanotubes (NT-WS2) with gold and silver nanoparticles via facile routes implying direct reaction of tungsten disulfide with water-soluble AuIII and AgI species at 100°C. The underlying mechanism of these interactions will be discussed in details based on extensive studies of reaction mixtures and resulting metal–NT-WS2 nanocomposites, including thorough X-ray photoelectron spectroscopy (XPS) analysis. Surprising features in optical spectra of the designed nanocomposites would be reported, including suppression of plasmon resonance in tiny noble metal nanoparticles (< 10 nm in diameter) grown onto NT-WS2. The plasmonic features of individual gold nanoparticles on the surface of disulfide nanotube were also characterized by electron energy loss spectroscopy in scanning transmission electron microscopy mode (STEM-EELS). Photoresistive NO2−sensing response of NT-WS2 under green light illumination (λmax = 530 nm) and its enhancement by plasmonic gold “nanoantennas” will be reported as well.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126744066","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}

引用次数: 0

Multi-walled carbon nanotube aerogels in quasi-optical terahertz beams 准光学太赫兹光束中的多壁碳纳米管气凝胶

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0055770

I. Dorofeev, V. Suslyaev, S. Moseenkov, V. Kuznetsov, K. Dorozhkin

{"title":"Multi-walled carbon nanotube aerogels in quasi-optical terahertz beams","authors":"I. Dorofeev, V. Suslyaev, S. Moseenkov, V. Kuznetsov, K. Dorozhkin","doi":"10.1063/5.0055770","DOIUrl":"https://doi.org/10.1063/5.0055770","url":null,"abstract":"The paper presents the modeling of the reflectance in the terahertz range from the plane-parallel aerogel layers formed by multi-walled carbon nanotubes (MWCNTs), which were synthesized via the original one-step technique using a preformed Fe–Co/CaO catalyst at 650–700°C in C2H4/Ar feedstock. With an increase in frequency from 100 GHz to 1.5 THz, the reflectance decreases by more than a factor of two. Based on the experimental data and the well-known wire medium model formed by a three-dimensional lattice of intersecting conductors, a model of a regular wire medium is constructed using MWCNTs with effective electrophysical characteristics equivalent to those of an irregular aerogel medium. This model reveals that a significant drop in the reflectance in the terahertz frequency range occurs because the plasma frequency of the equivalent medium is located here. The model allows estimating the properties of the aerogel environment in the frequency range extending up to 5 THz and with variations in the packing density of MWCNTs in aerogel. Estimates of the reflection, transmission, and absorption are presented for the case of normal EMI incidence on thin (submillimeter) layers of such a medium.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127348840","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}

引用次数: 0

Spectroscopic ellipsometry of large area monolayer WS2 and WSe2 films 大面积单层WS2和WSe2薄膜的椭偏光谱

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0054947

G. Ermolaev, D. Yakubovsky, Y. Stebunov, A. A. Voronov, A. Arsenin, V. Volkov

引用次数: 3

Optical properties of phototransistors based on complex alloys of transition metal dichalcogenides Mo0.5W0.5SSe 过渡金属双硫化物Mo0.5W0.5SSe复合合金光电晶体管的光学特性

PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019) Pub Date : 2021-06-22 DOI: 10.1063/5.0057531

M. Vasina, A. Y. Avdihziyan, A. Shestakova, S. Lavrov, E. Mishina

引用次数: 0