Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna
Background: Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) with intrinsically crystal inversion-symmetry breaking have shown many advanced optical properties. In particular, the valley polarization in 2D TMDCs that can be addressed optically has inspired new physical phenomena and gre...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Beilstein-Institut
2018-03-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.9.71 |
| _version_ | 1819156616640987136 |
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| author | Haitao Chen Mingkai Liu Lei Xu Dragomir N. Neshev |
| author_facet | Haitao Chen Mingkai Liu Lei Xu Dragomir N. Neshev |
| author_sort | Haitao Chen |
| collection | DOAJ |
| description | Background: Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) with intrinsically crystal inversion-symmetry breaking have shown many advanced optical properties. In particular, the valley polarization in 2D TMDCs that can be addressed optically has inspired new physical phenomena and great potential applications in valleytronics.Results: Here, we propose a TMDC–nanoantenna system that could effectively enhance and direct emission from the two valleys in TMDCs into diametrically opposite directions. By mimicking the emission from each valley of the monolayer of WSe2 as a chiral point-dipole emitter, we demonstrate numerically that the emission from different valleys is directed into opposite directions when coupling to a double-bar plasmonic nanoantenna. The directionality derives from the interference between the dipole and quadrupole modes excited in the two bars, respectively. Thus, we could tune the emission direction from the proposed TMDC–nanoantenna system by tuning the pumping without changing the antenna structure. Furthermore, we discuss the general principles and the opportunities to improve the average performance of the nanoantenna structure.Conclusion: The scheme we propose here can potentially serve as an important component for valley-based applications, such as non-volatile information storage and processing. |
| first_indexed | 2024-12-22T15:55:42Z |
| format | Article |
| id | doaj.art-ae9ff1c6ed70427ca6343211ea8cd927 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-22T15:55:42Z |
| publishDate | 2018-03-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-ae9ff1c6ed70427ca6343211ea8cd9272022-12-21T18:20:47ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862018-03-019178078810.3762/bjnano.9.712190-4286-9-71Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantennaHaitao Chen0Mingkai Liu1Lei Xu2Dragomir N. Neshev3Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, AustraliaNonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, AustraliaNonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, AustraliaNonlinear Physics Centre, Research School of Physics and Engineering, Australian National University, Canberra, ACT 2601, AustraliaBackground: Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) with intrinsically crystal inversion-symmetry breaking have shown many advanced optical properties. In particular, the valley polarization in 2D TMDCs that can be addressed optically has inspired new physical phenomena and great potential applications in valleytronics.Results: Here, we propose a TMDC–nanoantenna system that could effectively enhance and direct emission from the two valleys in TMDCs into diametrically opposite directions. By mimicking the emission from each valley of the monolayer of WSe2 as a chiral point-dipole emitter, we demonstrate numerically that the emission from different valleys is directed into opposite directions when coupling to a double-bar plasmonic nanoantenna. The directionality derives from the interference between the dipole and quadrupole modes excited in the two bars, respectively. Thus, we could tune the emission direction from the proposed TMDC–nanoantenna system by tuning the pumping without changing the antenna structure. Furthermore, we discuss the general principles and the opportunities to improve the average performance of the nanoantenna structure.Conclusion: The scheme we propose here can potentially serve as an important component for valley-based applications, such as non-volatile information storage and processing.https://doi.org/10.3762/bjnano.9.712D materials, multipolar emissionnanoantennaplasmonictransition-metal dichalcogenidesvalley polarization |
| spellingShingle | Haitao Chen Mingkai Liu Lei Xu Dragomir N. Neshev Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna Beilstein Journal of Nanotechnology 2D materials, multipolar emission nanoantenna plasmonic transition-metal dichalcogenides valley polarization |
| title | Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna |
| title_full | Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna |
| title_fullStr | Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna |
| title_full_unstemmed | Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna |
| title_short | Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna |
| title_sort | valley selective directional emission from a transition metal dichalcogenide monolayer mediated by a plasmonic nanoantenna |
| topic | 2D materials, multipolar emission nanoantenna plasmonic transition-metal dichalcogenides valley polarization |
| url | https://doi.org/10.3762/bjnano.9.71 |
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