{"title":"Metasurface-based terahertz TE<sub>10</sub>-TE<sub>01</sub> mode converter.","authors":"Boyi Yang, Xiaojie Guo, Yinghao Guo, Guobin Ren","doi":"10.1364/AO.568826","DOIUrl":null,"url":null,"abstract":"<p><p>We designed a compact broadband mode converter based on metasurface technology, operating in the 180-210 GHz band (the effective bandwidth is approximately 22 GHz), which achieves high-efficiency conversion from the <i>T</i><i>E</i><sub>10</sub> mode in a standard WR-4 rectangular waveguide to the <i>T</i><i>E</i><sub>01</sub> mode in a circular waveguide. The mode converter consists of two sub-mode converters: the first, based on a magic-T waveguide, transforms the <i>T</i><i>E</i><sub>10</sub> mode into the <i>T</i><i>E</i><sub>20</sub> mode, and the second, based on a metasurface, converts the <i>T</i><i>E</i><sub>20</sub> mode into the <i>T</i><i>E</i><sub>01</sub> mode. Simulation results demonstrate that the conversion efficiency from the <i>T</i><i>E</i><sub>10</sub> mode to the <i>T</i><i>E</i><sub>01</sub> mode reaches a maximum of 88.3% (184.6 GHz), with a return loss 8.4%. This metasurface-based mode converter can replace traditional complex transitional waveguide structures, providing a solution for generating high-quality <i>T</i><i>E</i><sub>01</sub> mode in the terahertz band. Furthermore, the theoretical approach can be extended to the generation of other modes in the terahertz band.</p>","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"64 27","pages":"8104-8112"},"PeriodicalIF":0.0000,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied optics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1364/AO.568826","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
We designed a compact broadband mode converter based on metasurface technology, operating in the 180-210 GHz band (the effective bandwidth is approximately 22 GHz), which achieves high-efficiency conversion from the TE10 mode in a standard WR-4 rectangular waveguide to the TE01 mode in a circular waveguide. The mode converter consists of two sub-mode converters: the first, based on a magic-T waveguide, transforms the TE10 mode into the TE20 mode, and the second, based on a metasurface, converts the TE20 mode into the TE01 mode. Simulation results demonstrate that the conversion efficiency from the TE10 mode to the TE01 mode reaches a maximum of 88.3% (184.6 GHz), with a return loss 8.4%. This metasurface-based mode converter can replace traditional complex transitional waveguide structures, providing a solution for generating high-quality TE01 mode in the terahertz band. Furthermore, the theoretical approach can be extended to the generation of other modes in the terahertz band.