Joint time-frequency analysis on space-time-coding digital metasurfaces
Space-time and time-varying metastructures have attracted a lot of research interest in recent years. On the other hand, digital programmable metasurfaces have also gained great attention owing to their powerful capabilities in controlling electromagnetic (EM) fields and waves in real time, which is...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2022-01-01
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| Series: | JPhys Photonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2515-7647/acadc1 |
| _version_ | 1797844687610970112 |
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| author | Xiao Qing Chen Lei Zhang Yi Ning Zheng Zhuo Ran Huang Jing Cheng Liang Tie Jun Cui |
| author_facet | Xiao Qing Chen Lei Zhang Yi Ning Zheng Zhuo Ran Huang Jing Cheng Liang Tie Jun Cui |
| author_sort | Xiao Qing Chen |
| collection | DOAJ |
| description | Space-time and time-varying metastructures have attracted a lot of research interest in recent years. On the other hand, digital programmable metasurfaces have also gained great attention owing to their powerful capabilities in controlling electromagnetic (EM) fields and waves in real time, which is very suitable for implementing spatiotemporal modulations in a digital manner. Accordingly, space-time-coding (STC) digital metasurfaces have recently been proposed to realize advanced manipulations of EM wavefronts and digital information, allowing simultaneous control of propagation directions in the space domain and harmonic distributions in the frequency domain. However, their instantaneous responses and the connection between the time- and frequency-domain characteristics have not yet been fully revealed. Here, we present a joint time-frequency analysis method to revisit STC digital metasurfaces, in which the time-domain instantaneous scattering patterns and frequency-domain equivalent excitations are investigated to analyze the spatial-spectral distributions of the modulated waves. This joint time-frequency analysis method helps to better explain the basic working principle of STC digital metasurfaces and is expected to facilitate more applications in wireless communications, radar, imaging, and beamforming. |
| first_indexed | 2024-04-09T17:26:19Z |
| format | Article |
| id | doaj.art-b8c996650ce043188cc5dc17f8fde5e1 |
| institution | Directory Open Access Journal |
| issn | 2515-7647 |
| language | English |
| last_indexed | 2024-04-09T17:26:19Z |
| publishDate | 2022-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | JPhys Photonics |
| spelling | doaj.art-b8c996650ce043188cc5dc17f8fde5e12023-04-18T13:49:49ZengIOP PublishingJPhys Photonics2515-76472022-01-015101400210.1088/2515-7647/acadc1Joint time-frequency analysis on space-time-coding digital metasurfacesXiao Qing Chen0Lei Zhang1https://orcid.org/0000-0002-8791-6374Yi Ning Zheng2Zhuo Ran Huang3Jing Cheng Liang4Tie Jun Cui5https://orcid.org/0000-0002-5862-1497Institute of Electromagnetic Space and State Key Laboratory of Millimeter Waves, Southeast University , Nanjing, People’s Republic of ChinaInstitute of Electromagnetic Space and State Key Laboratory of Millimeter Waves, Southeast University , Nanjing, People’s Republic of ChinaInstitute of Electromagnetic Space and State Key Laboratory of Millimeter Waves, Southeast University , Nanjing, People’s Republic of ChinaInstitute of Electromagnetic Space and State Key Laboratory of Millimeter Waves, Southeast University , Nanjing, People’s Republic of ChinaInstitute of Electromagnetic Space and State Key Laboratory of Millimeter Waves, Southeast University , Nanjing, People’s Republic of ChinaInstitute of Electromagnetic Space and State Key Laboratory of Millimeter Waves, Southeast University , Nanjing, People’s Republic of ChinaSpace-time and time-varying metastructures have attracted a lot of research interest in recent years. On the other hand, digital programmable metasurfaces have also gained great attention owing to their powerful capabilities in controlling electromagnetic (EM) fields and waves in real time, which is very suitable for implementing spatiotemporal modulations in a digital manner. Accordingly, space-time-coding (STC) digital metasurfaces have recently been proposed to realize advanced manipulations of EM wavefronts and digital information, allowing simultaneous control of propagation directions in the space domain and harmonic distributions in the frequency domain. However, their instantaneous responses and the connection between the time- and frequency-domain characteristics have not yet been fully revealed. Here, we present a joint time-frequency analysis method to revisit STC digital metasurfaces, in which the time-domain instantaneous scattering patterns and frequency-domain equivalent excitations are investigated to analyze the spatial-spectral distributions of the modulated waves. This joint time-frequency analysis method helps to better explain the basic working principle of STC digital metasurfaces and is expected to facilitate more applications in wireless communications, radar, imaging, and beamforming.https://doi.org/10.1088/2515-7647/acadc1digital metasurfacesspace-time-codingtime-frequency analysisinstantaneous patternsharmonic distribution |
| spellingShingle | Xiao Qing Chen Lei Zhang Yi Ning Zheng Zhuo Ran Huang Jing Cheng Liang Tie Jun Cui Joint time-frequency analysis on space-time-coding digital metasurfaces JPhys Photonics digital metasurfaces space-time-coding time-frequency analysis instantaneous patterns harmonic distribution |
| title | Joint time-frequency analysis on space-time-coding digital metasurfaces |
| title_full | Joint time-frequency analysis on space-time-coding digital metasurfaces |
| title_fullStr | Joint time-frequency analysis on space-time-coding digital metasurfaces |
| title_full_unstemmed | Joint time-frequency analysis on space-time-coding digital metasurfaces |
| title_short | Joint time-frequency analysis on space-time-coding digital metasurfaces |
| title_sort | joint time frequency analysis on space time coding digital metasurfaces |
| topic | digital metasurfaces space-time-coding time-frequency analysis instantaneous patterns harmonic distribution |
| url | https://doi.org/10.1088/2515-7647/acadc1 |
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