Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide
Abstract A design of a switchable dual-mode linear-to-circular polarization converter (LTC-PC) in the terahertz (THz) band is reported based on vanadium dioxide (VO2). Adjusting the VO2 state allows the converter to alternate between the transmission and reflection modes. In the insulating state, VO...
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Nature Portfolio
2025-08-01
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| Online Access: | https://doi.org/10.1038/s41598-025-11988-7 |
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| author | Eman M. Eldesouki Ahmed Elsayed Abouelez |
| author_facet | Eman M. Eldesouki Ahmed Elsayed Abouelez |
| author_sort | Eman M. Eldesouki |
| collection | DOAJ |
| description | Abstract A design of a switchable dual-mode linear-to-circular polarization converter (LTC-PC) in the terahertz (THz) band is reported based on vanadium dioxide (VO2). Adjusting the VO2 state allows the converter to alternate between the transmission and reflection modes. In the insulating state, VO2 enables transmission mode operation for a forward x- or y-polarized wave. LTC polarization conversion occurs within the frequency bands of 1.26–1.47 THz and 1.83–1.85 THz. Moreover, this mode yields an LTC polarization conversion at a frequency of 1.7 THz. The polarizer operates in reflection mode when VO2 is in the metallic state. Two conversion bands are identified for circular polarization within the frequency bands of 0.93–1.67 THz and 1.80–1.86 THz. The dual-mode polarization converter achieves axial ratios below 3 dB and a polarization conversion efficiency greater than 0.8. Surface current distributions reveal the polarization conversion mechanisms. Furthermore, we analyze the polarization ellipses of both reflected and transmitted waves at various frequencies across the operational bands. We anticipate that the proposed design, featuring high performance and dual functionality, will be applicable in THz communication systems and sensors. |
| format | Article |
| id | doaj-art-a47a275288e3482c937a8eb2bbebfa87 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-a47a275288e3482c937a8eb2bbebfa872025-08-20T03:45:53ZengNature PortfolioScientific Reports2045-23222025-08-0115111710.1038/s41598-025-11988-7Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxideEman M. Eldesouki0Ahmed Elsayed Abouelez1Microwave Engineering Department, Electronics Research Institute (ERI)Microwave Engineering Department, Electronics Research Institute (ERI)Abstract A design of a switchable dual-mode linear-to-circular polarization converter (LTC-PC) in the terahertz (THz) band is reported based on vanadium dioxide (VO2). Adjusting the VO2 state allows the converter to alternate between the transmission and reflection modes. In the insulating state, VO2 enables transmission mode operation for a forward x- or y-polarized wave. LTC polarization conversion occurs within the frequency bands of 1.26–1.47 THz and 1.83–1.85 THz. Moreover, this mode yields an LTC polarization conversion at a frequency of 1.7 THz. The polarizer operates in reflection mode when VO2 is in the metallic state. Two conversion bands are identified for circular polarization within the frequency bands of 0.93–1.67 THz and 1.80–1.86 THz. The dual-mode polarization converter achieves axial ratios below 3 dB and a polarization conversion efficiency greater than 0.8. Surface current distributions reveal the polarization conversion mechanisms. Furthermore, we analyze the polarization ellipses of both reflected and transmitted waves at various frequencies across the operational bands. We anticipate that the proposed design, featuring high performance and dual functionality, will be applicable in THz communication systems and sensors.https://doi.org/10.1038/s41598-025-11988-7TerahertzMetamaterialsPolarization converterVanadium dioxideDual mode |
| spellingShingle | Eman M. Eldesouki Ahmed Elsayed Abouelez Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide Scientific Reports Terahertz Metamaterials Polarization converter Vanadium dioxide Dual mode |
| title | Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide |
| title_full | Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide |
| title_fullStr | Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide |
| title_full_unstemmed | Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide |
| title_short | Switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium-dioxide |
| title_sort | switchable linear to circular polarization conversion in reflection and transmission modes based on vanadium dioxide |
| topic | Terahertz Metamaterials Polarization converter Vanadium dioxide Dual mode |
| url | https://doi.org/10.1038/s41598-025-11988-7 |
| work_keys_str_mv | AT emanmeldesouki switchablelineartocircularpolarizationconversioninreflectionandtransmissionmodesbasedonvanadiumdioxide AT ahmedelsayedabouelez switchablelineartocircularpolarizationconversioninreflectionandtransmissionmodesbasedonvanadiumdioxide |