Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers
The transition metal dichalcogenides (TMDs) have drawn great research attention, motivated by the derived remarkable optoelectronic properties and the potentials for high-efficient excitonic devices. The plasmonic nanocavity, integrating deep-sub wavelength confinement of optical mode with dramatic...
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| Format: | Article |
| Language: | English |
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De Gruyter
2022-05-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2022-0201 |
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| author | Su Guangxu Gao Anyuan Peng Bo Hu Junzheng Zhang Yi Liu Fanxin Zhang Hao Zhan Peng Wu Wei |
| author_facet | Su Guangxu Gao Anyuan Peng Bo Hu Junzheng Zhang Yi Liu Fanxin Zhang Hao Zhan Peng Wu Wei |
| author_sort | Su Guangxu |
| collection | DOAJ |
| description | The transition metal dichalcogenides (TMDs) have drawn great research attention, motivated by the derived remarkable optoelectronic properties and the potentials for high-efficient excitonic devices. The plasmonic nanocavity, integrating deep-sub wavelength confinement of optical mode with dramatic localized field enhancement, provides a practical platform to manipulate light–matter interaction. In order to obtain strong exciton–plasmon coupling effects, it’s crucial to match the vibration direction of exciton to the available strong localized in-plane electric field. Herein, we demonstrate the coupling effect of in-plane exciton in monolayer tungsten diselenide (WSe2) to deterministic gap-plasmon field which is produced by nanometrically gapped collapsed nanofingers. The gap-plasmon field which is completely parallel to the in-plane excitons in WSe2 will drive a strong exciton–plasmon coupling at room temperature. More interestingly, it is experimentally observed that the luminescence of exciton–polariton cannot be influenced by the temperature in the range from 77 K to 300 K due to the presence of nanofingers. According to the theoretical analysis results, we attribute this finding to the dielectric screening effect arising from the extremely strong localized electric field of plasmonic nanofingers. This work proposes a feasible way to harness and manipulate the exciton of low-dimensional semiconductor, which might be potential for quantum optoelectronics. |
| first_indexed | 2024-04-10T21:35:07Z |
| format | Article |
| id | doaj.art-a02b9f8524c74069a7c58571728c5604 |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-04-10T21:35:07Z |
| publishDate | 2022-05-01 |
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| series | Nanophotonics |
| spelling | doaj.art-a02b9f8524c74069a7c58571728c56042023-01-19T12:47:00ZengDe GruyterNanophotonics2192-86142022-05-0111133149315710.1515/nanoph-2022-0201Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingersSu Guangxu0Gao Anyuan1Peng Bo2Hu Junzheng3Zhang Yi4Liu Fanxin5Zhang Hao6Zhan Peng7Wu Wei8National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and School of Physics, Nanjing University, Nanjing210093, ChinaNational Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and School of Physics, Nanjing University, Nanjing210093, ChinaDepartment of Optical Science and Engineering, Fudan University, Shanghai200433, ChinaNational Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and School of Physics, Nanjing University, Nanjing210093, ChinaCollege of Energy and Electrical Engineering, Hohai University, Nanjing, 210098, ChinaNational Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and School of Physics, Nanjing University, Nanjing210093, ChinaDepartment of Optical Science and Engineering, Fudan University, Shanghai200433, ChinaNational Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures and School of Physics, Nanjing University, Nanjing210093, ChinaDepartment of Electrical Engineering-Electrophysics, University of Southern California, Los Angeles, CA90089, USAThe transition metal dichalcogenides (TMDs) have drawn great research attention, motivated by the derived remarkable optoelectronic properties and the potentials for high-efficient excitonic devices. The plasmonic nanocavity, integrating deep-sub wavelength confinement of optical mode with dramatic localized field enhancement, provides a practical platform to manipulate light–matter interaction. In order to obtain strong exciton–plasmon coupling effects, it’s crucial to match the vibration direction of exciton to the available strong localized in-plane electric field. Herein, we demonstrate the coupling effect of in-plane exciton in monolayer tungsten diselenide (WSe2) to deterministic gap-plasmon field which is produced by nanometrically gapped collapsed nanofingers. The gap-plasmon field which is completely parallel to the in-plane excitons in WSe2 will drive a strong exciton–plasmon coupling at room temperature. More interestingly, it is experimentally observed that the luminescence of exciton–polariton cannot be influenced by the temperature in the range from 77 K to 300 K due to the presence of nanofingers. According to the theoretical analysis results, we attribute this finding to the dielectric screening effect arising from the extremely strong localized electric field of plasmonic nanofingers. This work proposes a feasible way to harness and manipulate the exciton of low-dimensional semiconductor, which might be potential for quantum optoelectronics.https://doi.org/10.1515/nanoph-2022-0201collapsed nanofingersexciton–polaritonsin-plane strong couplingmonolayer wse2 photoluminescence |
| spellingShingle | Su Guangxu Gao Anyuan Peng Bo Hu Junzheng Zhang Yi Liu Fanxin Zhang Hao Zhan Peng Wu Wei Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers Nanophotonics collapsed nanofingers exciton–polaritons in-plane strong coupling monolayer wse2 photoluminescence |
| title | Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers |
| title_full | Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers |
| title_fullStr | Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers |
| title_full_unstemmed | Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers |
| title_short | Observation of in-plane exciton–polaritons in monolayer WSe2 driven by plasmonic nanofingers |
| title_sort | observation of in plane exciton polaritons in monolayer wse2 driven by plasmonic nanofingers |
| topic | collapsed nanofingers exciton–polaritons in-plane strong coupling monolayer wse2 photoluminescence |
| url | https://doi.org/10.1515/nanoph-2022-0201 |
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