Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene
Here, we investigate the nonreciprocal propagation and amplification of surface plasmons in drift-current biased graphene, using both Galilean and relativistic-type Doppler shift transformations of the graphene’s conductivity. Consistent with previous studies, both conductivity models predict strong...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2022-11-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2022-0451 |
| _version_ | 1811320092099608576 |
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| author | Morgado Tiago A. Silveirinha Mário G. |
| author_facet | Morgado Tiago A. Silveirinha Mário G. |
| author_sort | Morgado Tiago A. |
| collection | DOAJ |
| description | Here, we investigate the nonreciprocal propagation and amplification of surface plasmons in drift-current biased graphene, using both Galilean and relativistic-type Doppler shift transformations of the graphene’s conductivity. Consistent with previous studies, both conductivity models predict strongly nonreciprocal propagation of surface plasmons due to the drag effect caused by the drifting electrons. In particular, the Galilean Doppler shift model leads to stronger spectral asymmetries in the plasmon dispersion with regimes of unidirectional propagation. Remarkably, it is shown that both conductivity models predict regimes of nonreciprocal plasmon amplification in a wide angular sector of in-plane directions when the drift-current biased graphene sheet is coupled to a plasmonic substrate (namely, SiC), with the plasmon amplification rate being substantially higher for the relativistic Doppler shift model. |
| first_indexed | 2024-04-13T12:54:13Z |
| format | Article |
| id | doaj.art-d10e6e0cea88441480e1516b88a8469f |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-04-13T12:54:13Z |
| publishDate | 2022-11-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-d10e6e0cea88441480e1516b88a8469f2022-12-22T02:46:07ZengDe GruyterNanophotonics2192-86142022-11-0111214929493610.1515/nanoph-2022-0451Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased grapheneMorgado Tiago A.0Silveirinha Mário G.1Instituto de Telecomunicações and Department of Electrical Engineering, University of Coimbra, 3030-290Coimbra, PortugalUniversity of Lisbon–Instituto Superior Técnico and Instituto de Telecomunicações, Avenida Rovisco Pais, 1, 1049-001Lisboa, PortugalHere, we investigate the nonreciprocal propagation and amplification of surface plasmons in drift-current biased graphene, using both Galilean and relativistic-type Doppler shift transformations of the graphene’s conductivity. Consistent with previous studies, both conductivity models predict strongly nonreciprocal propagation of surface plasmons due to the drag effect caused by the drifting electrons. In particular, the Galilean Doppler shift model leads to stronger spectral asymmetries in the plasmon dispersion with regimes of unidirectional propagation. Remarkably, it is shown that both conductivity models predict regimes of nonreciprocal plasmon amplification in a wide angular sector of in-plane directions when the drift-current biased graphene sheet is coupled to a plasmonic substrate (namely, SiC), with the plasmon amplification rate being substantially higher for the relativistic Doppler shift model.https://doi.org/10.1515/nanoph-2022-0451active mediumgraphenenonreciprocityplasmonics |
| spellingShingle | Morgado Tiago A. Silveirinha Mário G. Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene Nanophotonics active medium graphene nonreciprocity plasmonics |
| title | Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene |
| title_full | Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene |
| title_fullStr | Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene |
| title_full_unstemmed | Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene |
| title_short | Directional dependence of the plasmonic gain and nonreciprocity in drift-current biased graphene |
| title_sort | directional dependence of the plasmonic gain and nonreciprocity in drift current biased graphene |
| topic | active medium graphene nonreciprocity plasmonics |
| url | https://doi.org/10.1515/nanoph-2022-0451 |
| work_keys_str_mv | AT morgadotiagoa directionaldependenceoftheplasmonicgainandnonreciprocityindriftcurrentbiasedgraphene AT silveirinhamariog directionaldependenceoftheplasmonicgainandnonreciprocityindriftcurrentbiasedgraphene |