Directional color routing assisted by switchable Fano resonance in bimetallic metagrating
Great progress in nanophotonics has been demonstrated in tailoring the impinging beams. The physics behind those intriguing effects is to a large extent governed by the parameter of the optical phase. While, simple nanostructures usually suffer from fundamental limitations on their efficiency in wav...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2021-06-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2021-0155 |
| _version_ | 1818887611540832256 |
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| author | Liu Feifei Wang Meng Zhang Xinping |
| author_facet | Liu Feifei Wang Meng Zhang Xinping |
| author_sort | Liu Feifei |
| collection | DOAJ |
| description | Great progress in nanophotonics has been demonstrated in tailoring the impinging beams. The physics behind those intriguing effects is to a large extent governed by the parameter of the optical phase. While, simple nanostructures usually suffer from fundamental limitations on their efficiency in wave transformation, especially in the transmission system, associated with their inadequate phase accumulation, challenge their implementation in practical application. Here, we describe a transparent nanostructure built from a pair of partially overlapped gold and aluminum semi-nanoshells that show almost π phase accumulation through material-dependent plasmon resonances. Combined with an optical slab waveguide, the bimetallic metagratings exhibit prominent directional color routing properties in transmission light, which result from switchable Fano resonances between plasmon resonances of bimetallic nanostructures and ±1 order waveguide diffraction modes at two opposite oblique incidences due to sufficient phase shift provided by the asymmetric and bimetallic plasmon resonators. Both theoretical and experimental results show that the Fano-resonance-assisted color routing exhibits a relatively broadband tuning range (∼150 nm with an efficiency of up to 50%) and a color routing efficiency of up to 70% at the central wavelength of λ = 600 nm. |
| first_indexed | 2024-12-19T16:39:59Z |
| format | Article |
| id | doaj.art-3279554db02342ab88b64e7e223ec190 |
| institution | Directory Open Access Journal |
| issn | 2192-8606 2192-8614 |
| language | English |
| last_indexed | 2024-12-19T16:39:59Z |
| publishDate | 2021-06-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-3279554db02342ab88b64e7e223ec1902022-12-21T20:13:49ZengDe GruyterNanophotonics2192-86062192-86142021-06-011092497250710.1515/nanoph-2021-0155Directional color routing assisted by switchable Fano resonance in bimetallic metagratingLiu Feifei0Wang Meng1Zhang Xinping2College Physics & Materials Science, Tianjin Normal University, Tianjin, 300387, ChinaInstitute of Information Photonics Technology, College of Applied Sciences, Beijng University of Technology, Beijing, 100124, ChinaInstitute of Information Photonics Technology, College of Applied Sciences, Beijng University of Technology, Beijing, 100124, ChinaGreat progress in nanophotonics has been demonstrated in tailoring the impinging beams. The physics behind those intriguing effects is to a large extent governed by the parameter of the optical phase. While, simple nanostructures usually suffer from fundamental limitations on their efficiency in wave transformation, especially in the transmission system, associated with their inadequate phase accumulation, challenge their implementation in practical application. Here, we describe a transparent nanostructure built from a pair of partially overlapped gold and aluminum semi-nanoshells that show almost π phase accumulation through material-dependent plasmon resonances. Combined with an optical slab waveguide, the bimetallic metagratings exhibit prominent directional color routing properties in transmission light, which result from switchable Fano resonances between plasmon resonances of bimetallic nanostructures and ±1 order waveguide diffraction modes at two opposite oblique incidences due to sufficient phase shift provided by the asymmetric and bimetallic plasmon resonators. Both theoretical and experimental results show that the Fano-resonance-assisted color routing exhibits a relatively broadband tuning range (∼150 nm with an efficiency of up to 50%) and a color routing efficiency of up to 70% at the central wavelength of λ = 600 nm.https://doi.org/10.1515/nanoph-2021-0155bimetallic metagratingdirectional color routingoptical phaseoptical waveguideplasmon resonance |
| spellingShingle | Liu Feifei Wang Meng Zhang Xinping Directional color routing assisted by switchable Fano resonance in bimetallic metagrating Nanophotonics bimetallic metagrating directional color routing optical phase optical waveguide plasmon resonance |
| title | Directional color routing assisted by switchable Fano resonance in bimetallic metagrating |
| title_full | Directional color routing assisted by switchable Fano resonance in bimetallic metagrating |
| title_fullStr | Directional color routing assisted by switchable Fano resonance in bimetallic metagrating |
| title_full_unstemmed | Directional color routing assisted by switchable Fano resonance in bimetallic metagrating |
| title_short | Directional color routing assisted by switchable Fano resonance in bimetallic metagrating |
| title_sort | directional color routing assisted by switchable fano resonance in bimetallic metagrating |
| topic | bimetallic metagrating directional color routing optical phase optical waveguide plasmon resonance |
| url | https://doi.org/10.1515/nanoph-2021-0155 |
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