Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution
Ultra-compact and tunable devices for terahertz (THz) beam manipulation are highly desired in wireless communication and radar scanning. Although the appearance of the Pancharatnam-Berry (PB) metasurface has provided strategies for THz beam scanning, active output power distribution is still difficu...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2023-09-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/5.0168561 |
| _version_ | 1827796946206588928 |
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| author | Jiayue Liu Fei Fan Zhiyu Tan Huijun Zhao Jierong Cheng Shengjiang Chang |
| author_facet | Jiayue Liu Fei Fan Zhiyu Tan Huijun Zhao Jierong Cheng Shengjiang Chang |
| author_sort | Jiayue Liu |
| collection | DOAJ |
| description | Ultra-compact and tunable devices for terahertz (THz) beam manipulation are highly desired in wireless communication and radar scanning. Although the appearance of the Pancharatnam-Berry (PB) metasurface has provided strategies for THz beam scanning, active output power distribution is still difficult to achieve, and the flexibility of beam manipulation is limited by a single metasurface. In this work, we demonstrated an all-dielectric cascaded metasurface consisting of a spin-decoupled metasurface and a PB metasurface. The conjugated characteristic of the PB phase for two photonic spin states is broken with highly efficient high-order diffractions of wave vector superposition through the cascaded metasurfaces, and both spin-symmetric and spin-asymmetric transmissions are obtained by designing the differences in metasurface bandwidth. Moreover, the output power between the deflection beams can be actively tuned by changing the incident polarization state, achieving power modulation ratios of 99.3% and 95.1% for the two conjugated spin beams, respectively. Therefore, this work realizes controllable wave division multiplexing and power distribution and opens new avenues for the design of ultra-compact multifunctional devices. |
| first_indexed | 2024-03-11T19:15:20Z |
| format | Article |
| id | doaj.art-92b3b47a50ae441486defde774fdf307 |
| institution | Directory Open Access Journal |
| issn | 2378-0967 |
| language | English |
| last_indexed | 2024-03-11T19:15:20Z |
| publishDate | 2023-09-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj.art-92b3b47a50ae441486defde774fdf3072023-10-09T09:02:04ZengAIP Publishing LLCAPL Photonics2378-09672023-09-0189096112096112-1010.1063/5.0168561Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distributionJiayue Liu0Fei Fan1Zhiyu Tan2Huijun Zhao3Jierong Cheng4Shengjiang Chang5Institute of Modern Optics, Nankai University, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, ChinaInstitute of Modern Optics, Nankai University, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, ChinaInstitute of Modern Optics, Nankai University, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, ChinaInstitute of Modern Optics, Nankai University, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, ChinaInstitute of Modern Optics, Nankai University, Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology, Tianjin 300350, ChinaTianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology, Tianjin 300350, ChinaUltra-compact and tunable devices for terahertz (THz) beam manipulation are highly desired in wireless communication and radar scanning. Although the appearance of the Pancharatnam-Berry (PB) metasurface has provided strategies for THz beam scanning, active output power distribution is still difficult to achieve, and the flexibility of beam manipulation is limited by a single metasurface. In this work, we demonstrated an all-dielectric cascaded metasurface consisting of a spin-decoupled metasurface and a PB metasurface. The conjugated characteristic of the PB phase for two photonic spin states is broken with highly efficient high-order diffractions of wave vector superposition through the cascaded metasurfaces, and both spin-symmetric and spin-asymmetric transmissions are obtained by designing the differences in metasurface bandwidth. Moreover, the output power between the deflection beams can be actively tuned by changing the incident polarization state, achieving power modulation ratios of 99.3% and 95.1% for the two conjugated spin beams, respectively. Therefore, this work realizes controllable wave division multiplexing and power distribution and opens new avenues for the design of ultra-compact multifunctional devices.http://dx.doi.org/10.1063/5.0168561 |
| spellingShingle | Jiayue Liu Fei Fan Zhiyu Tan Huijun Zhao Jierong Cheng Shengjiang Chang Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution APL Photonics |
| title | Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution |
| title_full | Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution |
| title_fullStr | Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution |
| title_full_unstemmed | Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution |
| title_short | Terahertz cascaded metasurfaces for both spin-symmetric and asymmetric beam diffractions with active power distribution |
| title_sort | terahertz cascaded metasurfaces for both spin symmetric and asymmetric beam diffractions with active power distribution |
| url | http://dx.doi.org/10.1063/5.0168561 |
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