In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub>
Anisotropic plasmonic surface supports elliptic, hyperbolic and even flattened polaritons, which is quite interesting for the diffractionless and highly collimated propagation of infrared light at the nanoscale. However, direct real-space near-field observation of anisotropic plasmons as well as fre...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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IEEE
2022-01-01
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| Series: | IEEE Photonics Journal |
| Subjects: | |
| Online Access: | https://ieeexplore.ieee.org/document/9695274/ |
| _version_ | 1811252656400760832 |
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| author | Shaopeng Li Qibing Sun |
| author_facet | Shaopeng Li Qibing Sun |
| author_sort | Shaopeng Li |
| collection | DOAJ |
| description | Anisotropic plasmonic surface supports elliptic, hyperbolic and even flattened polaritons, which is quite interesting for the diffractionless and highly collimated propagation of infrared light at the nanoscale. However, direct real-space near-field observation of anisotropic plasmons as well as frequency dependent topological transitions in natural materials have not been realized. In this paper, we theoretically investigate real-space anisotropic plasmons in WTe<sub>2</sub> thin films by using a phenomenological cavity model, anisotropic near-field plasmonic images with specific interference patterns and isofrequency curves in momentum space have been demonstrated. Due to the frequency selective forbidden of plasmons along <italic>b</italic> axis, a topological transition from the elliptic to the hyperbolic regime is manifested. Moreover, the plasmons as well as topological transition present significant electrostatic-gating tunability. Our studies provide new insights into WTe<sub>2</sub> based plasmonic components for the manipulation of plasmon propagation, which capable of tailoring anisotropic two-dimensional light confinement in the far-infrared regime and can be applied to investigate other anisotropic materials. |
| first_indexed | 2024-04-12T16:38:11Z |
| format | Article |
| id | doaj.art-b3e9dd0795554ffb9fb56e103986e42b |
| institution | Directory Open Access Journal |
| issn | 1943-0655 |
| language | English |
| last_indexed | 2024-04-12T16:38:11Z |
| publishDate | 2022-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj.art-b3e9dd0795554ffb9fb56e103986e42b2022-12-22T03:24:54ZengIEEEIEEE Photonics Journal1943-06552022-01-011411510.1109/JPHOT.2022.31462089695274In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub>Shaopeng Li0https://orcid.org/0000-0002-5357-6439Qibing Sun1Department of Physics, Shaanxi University of Science and Technology, Xi'an, ChinaState Key Laboratory of Transient Optics and Photonics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Science, Xi'an, ChinaAnisotropic plasmonic surface supports elliptic, hyperbolic and even flattened polaritons, which is quite interesting for the diffractionless and highly collimated propagation of infrared light at the nanoscale. However, direct real-space near-field observation of anisotropic plasmons as well as frequency dependent topological transitions in natural materials have not been realized. In this paper, we theoretically investigate real-space anisotropic plasmons in WTe<sub>2</sub> thin films by using a phenomenological cavity model, anisotropic near-field plasmonic images with specific interference patterns and isofrequency curves in momentum space have been demonstrated. Due to the frequency selective forbidden of plasmons along <italic>b</italic> axis, a topological transition from the elliptic to the hyperbolic regime is manifested. Moreover, the plasmons as well as topological transition present significant electrostatic-gating tunability. Our studies provide new insights into WTe<sub>2</sub> based plasmonic components for the manipulation of plasmon propagation, which capable of tailoring anisotropic two-dimensional light confinement in the far-infrared regime and can be applied to investigate other anisotropic materials.https://ieeexplore.ieee.org/document/9695274/Plasmonanisotropytopological transition |
| spellingShingle | Shaopeng Li Qibing Sun In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub> IEEE Photonics Journal Plasmon anisotropy topological transition |
| title | In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub> |
| title_full | In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub> |
| title_fullStr | In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub> |
| title_full_unstemmed | In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub> |
| title_short | In-Plane Anisotropic Plasmons in Van Der Waals Thin Films of WTe<sub>2</sub> |
| title_sort | in plane anisotropic plasmons in van der waals thin films of wte sub 2 sub |
| topic | Plasmon anisotropy topological transition |
| url | https://ieeexplore.ieee.org/document/9695274/ |
| work_keys_str_mv | AT shaopengli inplaneanisotropicplasmonsinvanderwaalsthinfilmsofwtesub2sub AT qibingsun inplaneanisotropicplasmonsinvanderwaalsthinfilmsofwtesub2sub |