Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy
Abstract Low-loss dielectric modes are important features and functional bases of fundamental optical components in on-chip optical devices. However, dielectric near-field modes are challenging to reveal with high spatiotemporal resolution and fast direct imaging. Herein, we present a method to addr...
| Main Authors: | , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2023-08-01
|
| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-40603-4 |
| _version_ | 1797558527442550784 |
|---|---|
| author | Yaolong Li Pengzuo Jiang Xiaying Lyu Xiaofang Li Huixin Qi Jinglin Tang Zhaohang Xue Hong Yang Guowei Lu Quan Sun Xiaoyong Hu Yunan Gao Qihuang Gong |
| author_facet | Yaolong Li Pengzuo Jiang Xiaying Lyu Xiaofang Li Huixin Qi Jinglin Tang Zhaohang Xue Hong Yang Guowei Lu Quan Sun Xiaoyong Hu Yunan Gao Qihuang Gong |
| author_sort | Yaolong Li |
| collection | DOAJ |
| description | Abstract Low-loss dielectric modes are important features and functional bases of fundamental optical components in on-chip optical devices. However, dielectric near-field modes are challenging to reveal with high spatiotemporal resolution and fast direct imaging. Herein, we present a method to address this issue by applying time-resolved photoemission electron microscopy to a low-dimensional wide-bandgap semiconductor, hexagonal boron nitride (hBN). Taking a low-loss dielectric planar waveguide as a fundamental structure, static vector near-field vortices with different topological charges and the spatiotemporal evolution of waveguide modes are directly revealed. With the lowest-order vortex structure, strong nanofocusing in real space is realized, while near-vertical photoemission in momentum space and narrow spread in energy space are simultaneously observed due to the atomically flat surface of hBN and the small photoemission horizon set by the limited photon energies. Our approach provides a strategy for the realization of flat photoemission emitters. |
| first_indexed | 2024-03-10T17:31:40Z |
| format | Article |
| id | doaj.art-785a1b1e28d84900bf656f00006d5f9e |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-10T17:31:40Z |
| publishDate | 2023-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-785a1b1e28d84900bf656f00006d5f9e2023-11-20T09:59:08ZengNature PortfolioNature Communications2041-17232023-08-011411710.1038/s41467-023-40603-4Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopyYaolong Li0Pengzuo Jiang1Xiaying Lyu2Xiaofang Li3Huixin Qi4Jinglin Tang5Zhaohang Xue6Hong Yang7Guowei Lu8Quan Sun9Xiaoyong Hu10Yunan Gao11Qihuang Gong12State Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityPeking University Yangtze Delta Institute of OptoelectronicsState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityState Key Laboratory for Mesoscopic Physics & Department of Physics, Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano-optoelectronics, Beijing Academy of Quantum Information Sciences, Peking UniversityAbstract Low-loss dielectric modes are important features and functional bases of fundamental optical components in on-chip optical devices. However, dielectric near-field modes are challenging to reveal with high spatiotemporal resolution and fast direct imaging. Herein, we present a method to address this issue by applying time-resolved photoemission electron microscopy to a low-dimensional wide-bandgap semiconductor, hexagonal boron nitride (hBN). Taking a low-loss dielectric planar waveguide as a fundamental structure, static vector near-field vortices with different topological charges and the spatiotemporal evolution of waveguide modes are directly revealed. With the lowest-order vortex structure, strong nanofocusing in real space is realized, while near-vertical photoemission in momentum space and narrow spread in energy space are simultaneously observed due to the atomically flat surface of hBN and the small photoemission horizon set by the limited photon energies. Our approach provides a strategy for the realization of flat photoemission emitters.https://doi.org/10.1038/s41467-023-40603-4 |
| spellingShingle | Yaolong Li Pengzuo Jiang Xiaying Lyu Xiaofang Li Huixin Qi Jinglin Tang Zhaohang Xue Hong Yang Guowei Lu Quan Sun Xiaoyong Hu Yunan Gao Qihuang Gong Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy Nature Communications |
| title | Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy |
| title_full | Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy |
| title_fullStr | Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy |
| title_full_unstemmed | Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy |
| title_short | Revealing low-loss dielectric near-field modes of hexagonal boron nitride by photoemission electron microscopy |
| title_sort | revealing low loss dielectric near field modes of hexagonal boron nitride by photoemission electron microscopy |
| url | https://doi.org/10.1038/s41467-023-40603-4 |
| work_keys_str_mv | AT yaolongli revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT pengzuojiang revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT xiayinglyu revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT xiaofangli revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT huixinqi revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT jinglintang revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT zhaohangxue revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT hongyang revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT guoweilu revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT quansun revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT xiaoyonghu revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT yunangao revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy AT qihuanggong revealinglowlossdielectricnearfieldmodesofhexagonalboronnitridebyphotoemissionelectronmicroscopy |