D. Lavrukhin, I. Glinskiy, N. Zenchenko, R. Khabibullin, A. Arsenin, D. Yakubovsky, V. Volkov, I. Minin, O. Minin, K. Zaytsev, D. Ponomarev
We report on two approaches aimed at increasing the performance of a photoconductive antenna (PCA) due to enhanced optical light confinement in a PCA's gap. The first refers to the use of a high-aspect ratio metal grating maintaining plasmonic guided modes while the second implies an asymmetric dielectric particle combined with a prism on a metal surface to provide a sub-wavelength focusing of a laser beam. We reached a 3000-fold increase in the emitted THz power and a 25-fold THz photocurrent enhancement in a plasmon-assisted PCA; the further increase in both parameters might be reached by optimizing the geometry of the grating. We propose a new curved beam - the photonic hook plasmon that can be realized using the in-plane focusing of the surface plasmon-polariton wave through a dielectric particle. We demonstrate a potential possibility to reach predominantly a sub-wavelength focused and high-intensive beam obtained from the opposite side of the dielectric particle.
{"title":"Optical light confinement in terahertz antennas","authors":"D. Lavrukhin, I. Glinskiy, N. Zenchenko, R. Khabibullin, A. Arsenin, D. Yakubovsky, V. Volkov, I. Minin, O. Minin, K. Zaytsev, D. Ponomarev","doi":"10.1063/5.0054907","DOIUrl":"https://doi.org/10.1063/5.0054907","url":null,"abstract":"We report on two approaches aimed at increasing the performance of a photoconductive antenna (PCA) due to enhanced optical light confinement in a PCA's gap. The first refers to the use of a high-aspect ratio metal grating maintaining plasmonic guided modes while the second implies an asymmetric dielectric particle combined with a prism on a metal surface to provide a sub-wavelength focusing of a laser beam. We reached a 3000-fold increase in the emitted THz power and a 25-fold THz photocurrent enhancement in a plasmon-assisted PCA; the further increase in both parameters might be reached by optimizing the geometry of the grating. We propose a new curved beam - the photonic hook plasmon that can be realized using the in-plane focusing of the surface plasmon-polariton wave through a dielectric particle. We demonstrate a potential possibility to reach predominantly a sub-wavelength focused and high-intensive beam obtained from the opposite side of the dielectric particle.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"338 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":"123129092","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}
In this work, we present the experimental results of the study of THz radiation generated by layered WS2, MoSe2 and Mo0.5W0.5S2. THz radiation was observed in the range of 0.1-3 THz. An increase in the amplitude of THz radiation in Mo0.5W0.5S2 relative to WS2, MoSe2 is shown. A symmetry analysis of the azimuthal dependences of THz radiation made it possible to estimate the contribution of THz radiation mechanisms to the generation of THz radiation.
{"title":"The generation of THz radiation in layered transition metal dichalcogenides","authors":"A. Buryakov, A. Gorbatova, D. Khusyainov","doi":"10.1063/5.0055452","DOIUrl":"https://doi.org/10.1063/5.0055452","url":null,"abstract":"In this work, we present the experimental results of the study of THz radiation generated by layered WS2, MoSe2 and Mo0.5W0.5S2. THz radiation was observed in the range of 0.1-3 THz. An increase in the amplitude of THz radiation in Mo0.5W0.5S2 relative to WS2, MoSe2 is shown. A symmetry analysis of the azimuthal dependences of THz radiation made it possible to estimate the contribution of THz radiation mechanisms to the generation of THz radiation.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"32 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":"116298394","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}
Xieyu Xu, O. Kapitanova, D. Itkis, P. Evdokimov, Nikita R. Yarenkov, O. Eremina, M. Gallyamov, R. Valeev, A. Eliseev, G. Panin
In this paper for the first time, a comparison was made of the electrochemical activity of graphene oxides synthesized by modified Hummer's, Brodie and electrochemical methods in aprotic media. Electrodes based on these GOs exhibit electrochemical activity in an aprotic solvent of propylene carbonate with 0.1 M (C4H9)4NClO4 electrolytes in the potential range from -3 to 1 V rel. Ag+/Ag in 0.01M AgNO3 0.1M (C4H9)4NClO4 in acetonitrile. These redox processes are irreversible. Despite the fact that the types of oxygen groups in GO synthesized by different methods are the same, the ratio of these groups is different. The specific capacity of electrodes based on GO during redox processes in aprotic media correlates with the C:O ratio determined from elemental analysis. The use of new active electrode materials based on graphene in electrochemical processes will allow the creation of electrochemical energy storage devices with a higher energy density and capacity.
{"title":"Redox processes in graphene oxide for storing and converting energy","authors":"Xieyu Xu, O. Kapitanova, D. Itkis, P. Evdokimov, Nikita R. Yarenkov, O. Eremina, M. Gallyamov, R. Valeev, A. Eliseev, G. Panin","doi":"10.1063/5.0056500","DOIUrl":"https://doi.org/10.1063/5.0056500","url":null,"abstract":"In this paper for the first time, a comparison was made of the electrochemical activity of graphene oxides synthesized by modified Hummer's, Brodie and electrochemical methods in aprotic media. Electrodes based on these GOs exhibit electrochemical activity in an aprotic solvent of propylene carbonate with 0.1 M (C4H9)4NClO4 electrolytes in the potential range from -3 to 1 V rel. Ag+/Ag in 0.01M AgNO3 0.1M (C4H9)4NClO4 in acetonitrile. These redox processes are irreversible. Despite the fact that the types of oxygen groups in GO synthesized by different methods are the same, the ratio of these groups is different. The specific capacity of electrodes based on GO during redox processes in aprotic media correlates with the C:O ratio determined from elemental analysis. The use of new active electrode materials based on graphene in electrochemical processes will allow the creation of electrochemical energy storage devices with a higher energy density and capacity.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"13 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":"121631570","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}
A. A. Gogina, I. Klimovskikh, D. Estyunin, S. Filnov, A. Shikin
This paper reports on an investigation by angle-resolved photoelectron spectroscopy of the graphene on Re(0001) sub- strate, after intercalation by bismuth atoms. Our results demonstrate that intercalation of Bi atoms restores the quasi-free-standing properties of graphene. Thus, the band structure of this system is characterized by a linear π-state dispersion near the K point of the Brillouin zone. The Dirac point shifts toward higher binding energies by approximately 0.4 eV, which is caused by charge transfer from Bi atoms to graphene. Besides we observed a band gap with a width of at least 0.4 eV. The possible reasons of the band gap in the system Gr/Bi/Re(0001) can be caused by hybridization of π-states of graphene with 5d-rhenium states and/or bismuth states or symmetry breaking of the sublattices of graphene. Moreover, the Dirac point position is found to be different depending on the intercalated atoms. Intercalation of the oxygen atoms underneath graphene after exposure to the air results in the appearance of the second π-state branch in the electronic structure. There are two Dirac cones in the ARPES image and for the first one the charge transfer from the Bi atoms leads to the Dirac point position below the Fermi level, i.e. to the n-doping of graphene. For the second one the Dirac point is located above the Fermi level resulting in p-doping that is caused by charge transfer between oxygen and graphene atoms.
{"title":"Dirac cone manipulation via bismuth and oxygen intercalation underneath graphene on Re(0001)","authors":"A. A. Gogina, I. Klimovskikh, D. Estyunin, S. Filnov, A. Shikin","doi":"10.1063/5.0056673","DOIUrl":"https://doi.org/10.1063/5.0056673","url":null,"abstract":"This paper reports on an investigation by angle-resolved photoelectron spectroscopy of the graphene on Re(0001) sub- strate, after intercalation by bismuth atoms. Our results demonstrate that intercalation of Bi atoms restores the quasi-free-standing properties of graphene. Thus, the band structure of this system is characterized by a linear π-state dispersion near the K point of the Brillouin zone. The Dirac point shifts toward higher binding energies by approximately 0.4 eV, which is caused by charge transfer from Bi atoms to graphene. Besides we observed a band gap with a width of at least 0.4 eV. The possible reasons of the band gap in the system Gr/Bi/Re(0001) can be caused by hybridization of π-states of graphene with 5d-rhenium states and/or bismuth states or symmetry breaking of the sublattices of graphene. Moreover, the Dirac point position is found to be different depending on the intercalated atoms. Intercalation of the oxygen atoms underneath graphene after exposure to the air results in the appearance of the second π-state branch in the electronic structure. There are two Dirac cones in the ARPES image and for the first one the charge transfer from the Bi atoms leads to the Dirac point position below the Fermi level, i.e. to the n-doping of graphene. For the second one the Dirac point is located above the Fermi level resulting in p-doping that is caused by charge transfer between oxygen and graphene atoms.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"10 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":"128607535","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}
A novel graphene-based waveguide integrated with a stub-nanoresonator loaded with a semiconductor nanowire for control of surface plasmon-polariton propagation has been developed and simulated.
{"title":"Nonlinear plasmonic switching in graphene stub-nanoresonator loaded with semiconductor nanowire","authors":"M. Gubin, V. Volkov, A. Prokhorov","doi":"10.1063/5.0054946","DOIUrl":"https://doi.org/10.1063/5.0054946","url":null,"abstract":"A novel graphene-based waveguide integrated with a stub-nanoresonator loaded with a semiconductor nanowire for control of surface plasmon-polariton propagation has been developed and simulated.","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":"131367896","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}
Using terahertz spectroscopy, we investigated the terahertz emission from the surface of bulk Mo0.5W0.5S2 crystallites. The temporal and spectral characteristics of the generated terahertz radiation obtained. We demonstrate the possibility of using Mo0.5W0.5S2 alloy in terahertz devices.
{"title":"Generation of the THz radiation in Mo0.5W0.5S2 solid solution","authors":"A. Gorbatova, D. Khusyainov, A. Buryakov","doi":"10.1063/5.0055454","DOIUrl":"https://doi.org/10.1063/5.0055454","url":null,"abstract":"Using terahertz spectroscopy, we investigated the terahertz emission from the surface of bulk Mo0.5W0.5S2 crystallites. The temporal and spectral characteristics of the generated terahertz radiation obtained. We demonstrate the possibility of using Mo0.5W0.5S2 alloy in terahertz devices.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"31 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":"132590132","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}
Two-dimensional (2D) materials providing unique optical and electronic properties have been a subject of extensive research over the last decade. However, conventional optical methods such as Raman, photoluminescence, and absorption spectroscopy have obstacles in gathering dynamic characteristics due to the difficulty of signal collection from atomically thin layers. One of the ways to improve optical properties of 2D materials consists in coupling them with specifically tailored single resonant optical nanocavities and arrays of them, in the form of metasurfaces. Plasmonic metamaterials enabling manipulations of light phase in 2D plane are of particular importance as they could provide breakthrough tools for studying properties of planar structures and functional interfaces, including newly emerging 2D materials and van der Waals heterostructures that promise appealing applications in electronics, optics, photochemistry, biomedicine, etc. Here we demonstrate the optical properties of phase-responsive plasmonic metasurfaces and show its potential for studying surface-enhanced Raman scattering over single-layered materials.
{"title":"Plasmonic metasurfaces for probing two-dimensional materials","authors":"G. Tselikov, A. Arsenin, V. Volkov","doi":"10.1063/5.0054931","DOIUrl":"https://doi.org/10.1063/5.0054931","url":null,"abstract":"Two-dimensional (2D) materials providing unique optical and electronic properties have been a subject of extensive research over the last decade. However, conventional optical methods such as Raman, photoluminescence, and absorption spectroscopy have obstacles in gathering dynamic characteristics due to the difficulty of signal collection from atomically thin layers. One of the ways to improve optical properties of 2D materials consists in coupling them with specifically tailored single resonant optical nanocavities and arrays of them, in the form of metasurfaces. Plasmonic metamaterials enabling manipulations of light phase in 2D plane are of particular importance as they could provide breakthrough tools for studying properties of planar structures and functional interfaces, including newly emerging 2D materials and van der Waals heterostructures that promise appealing applications in electronics, optics, photochemistry, biomedicine, etc. Here we demonstrate the optical properties of phase-responsive plasmonic metasurfaces and show its potential for studying surface-enhanced Raman scattering over single-layered materials.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"35 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":"121191136","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}
V. Kaydashev, B. Khlebtsov, A. Miakonkikh, S. Zhukov, E. Zhukova, D. Svintsov
Graphene plasmons in the THz/midIR range are normally excited by using lithography prepared grating with elements 300-20 nm width.However mass reproduction of such gratings by lithography on macroscopic area of ∼1cm2 is labor-consuming and expensive technology. We study the generation of graphene plasmons generated using randomly oriented particle-like nanorods prepared by cheap self-assembling method. The THz/midIR graphne plasmons localized under metallic rods which are strongly coupled with graphene and are capable to enhance absorption of standing-by molecules.
{"title":"Excitation of localized graphene plasmons by using non-periodical self-assembled arrays of metallic antennas","authors":"V. Kaydashev, B. Khlebtsov, A. Miakonkikh, S. Zhukov, E. Zhukova, D. Svintsov","doi":"10.1063/5.0055273","DOIUrl":"https://doi.org/10.1063/5.0055273","url":null,"abstract":"Graphene plasmons in the THz/midIR range are normally excited by using lithography prepared grating with elements 300-20 nm width.However mass reproduction of such gratings by lithography on macroscopic area of ∼1cm2 is labor-consuming and expensive technology. We study the generation of graphene plasmons generated using randomly oriented particle-like nanorods prepared by cheap self-assembling method. The THz/midIR graphne plasmons localized under metallic rods which are strongly coupled with graphene and are capable to enhance absorption of standing-by molecules.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"11 4 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":"125220125","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}
A. Chernov, P. Fedotov, E. Obraztsova, P. Shilina, P. Kapralov, Kayleigh L Y Fung, C. Stoppiello, V. Belotelov, A. Khlobystov
Graphene nanoribbons are attracting much attention as a platform for optoelectronics. Properties of graphene nanoribbons depend on the width, edge type, edge atoms, etc. and can be significantly changed. Inducing magnetism to graphene nanoribbons would open up a new field for applications. In this work we study optical and magnetic properties of graphene nanoribbons with cobalt incorporated atoms that were grown inside single-walled carbon nanotubes from cobalt phthalocyanine molecules.
{"title":"Graphene nanoribbons with incorporated Co atoms: Optical spectrum and magnetic response","authors":"A. Chernov, P. Fedotov, E. Obraztsova, P. Shilina, P. Kapralov, Kayleigh L Y Fung, C. Stoppiello, V. Belotelov, A. Khlobystov","doi":"10.1063/5.0055481","DOIUrl":"https://doi.org/10.1063/5.0055481","url":null,"abstract":"Graphene nanoribbons are attracting much attention as a platform for optoelectronics. Properties of graphene nanoribbons depend on the width, edge type, edge atoms, etc. and can be significantly changed. Inducing magnetism to graphene nanoribbons would open up a new field for applications. In this work we study optical and magnetic properties of graphene nanoribbons with cobalt incorporated atoms that were grown inside single-walled carbon nanotubes from cobalt phthalocyanine molecules.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"26 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":"126044708","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}
K. Voronin, G. Ermolaev, Y. Stebunov, A. Arsenin, A. Bylinkin, B. Jensen, B. Jørgensen, V. Volkov
In this work, we investigate graphene field-effect phototransistor based on photogating. We discuss the theory of this effect and predict such characteristics as the dependence of photoresponse on the gate voltage. To verify our considerations, we fabricate devices on different semiconductor substrates (silicon, germanium or gallium arsenide) and measure their properties. We demonstrate that photogating reveals opportunities for the development of highly sensitive broadband photodetectors from ultraviolet to mid-infrared ranges.
{"title":"Photogating in graphene field-effect phototransistors: Theory and observations","authors":"K. Voronin, G. Ermolaev, Y. Stebunov, A. Arsenin, A. Bylinkin, B. Jensen, B. Jørgensen, V. Volkov","doi":"10.1063/5.0054954","DOIUrl":"https://doi.org/10.1063/5.0054954","url":null,"abstract":"In this work, we investigate graphene field-effect phototransistor based on photogating. We discuss the theory of this effect and predict such characteristics as the dependence of photoresponse on the gate voltage. To verify our considerations, we fabricate devices on different semiconductor substrates (silicon, germanium or gallium arsenide) and measure their properties. We demonstrate that photogating reveals opportunities for the development of highly sensitive broadband photodetectors from ultraviolet to mid-infrared ranges.","PeriodicalId":405600,"journal":{"name":"PROCEEDINGS OF INTERNATIONAL CONGRESS ON GRAPHENE, 2D MATERIALS AND APPLICATIONS (2D MATERIALS 2019)","volume":"21 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":"123677688","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}
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