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Among various feasible approaches, the mechanism based on optical spin\u2013orbit coupling is investigated for unidirectional routing of surface plasmons and valley exciton\u2010polaritons, without needing the use of complicated magneto\u2010optical effects and parity symmetry breaking. So far, the direct near\u2010field nanoimaging of such exotic polaritonic modes based on optical spin\u2013orbit coupling has remained elusive. Here, the real\u2010space nanoimaging of unidirectional polaritons in van der Waals semiconductors are reported. Specifically, photonic spins are coupled into the tip of a scattering\u2010type scanning near\u2010field optical microscopy for circular dipolar excitations of spin\u2013orbit interactions, thus enabling the unidirectional waveguide exciton\u2010polariton propagation with remarkable unidirectionality (ratio of spectrum amplitudes under opposite circularly polarized illumination) R = 0.291 for TM mode. Via switching to the opposite helicities, the reversed opposite directions are observed. The work offers a promising avenue for detecting and processing spin information for future communication technology at the nanoscale.<\/jats:p>","DOI":"10.1002\/adma.202501669","type":"journal-article","created":{"date-parts":[[2025,4,2]],"date-time":"2025-04-02T05:10:22Z","timestamp":1743570622000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Direct Observation of Unidirectional Exciton Polaritons in Layered van der Waals Semiconductors"],"prefix":"10.1002","volume":"37","author":[{"given":"Yihua","family":"Bai","sequence":"first","affiliation":[{"name":"School of Physics University of Electronic Science and Technology of China  Chengdu 611731 China"},{"name":"School of Electrical and Electronic Engineering Nanyang Technological University  Singapore 639798 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiadian","family":"Yan","sequence":"additional","affiliation":[{"name":"School of Physics University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Physics University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuchen","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Electrical and Electronic Engineering Nanyang Technological University  Singapore 639798 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuelei","family":"Zeng","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fucai","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Min","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sheng","family":"Sun","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jun","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Electronic Science and Engineering University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuanjie","family":"Yang","sequence":"additional","affiliation":[{"name":"School of Physics University of Electronic Science and Technology of China  Chengdu 611731 China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3023-9632","authenticated-orcid":false,"given":"Guangwei","family":"Hu","sequence":"additional","affiliation":[{"name":"School of Electrical and Electronic Engineering Nanyang Technological University  Singapore 639798 Singapore"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,4]]},"reference":[{"key":"e_1_2_9_1_1","doi-asserted-by":"publisher","DOI":"10.1038\/nmat3279"},{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature11841"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1038\/nature19820"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1126\/science.1257671"},{"key":"e_1_2_9_5_1","first-page":"34","volume":"30","author":"Li Z.","year":"2018","journal-title":"Adv. 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N.Hohman D.Jariwala arXiv2023 arXiv;2308.11108."},{"key":"e_1_2_9_48_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41467-020-17335-w"}],"container-title":["Advanced Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/adma.202501669","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,6]],"date-time":"2025-10-06T16:45:24Z","timestamp":1759769124000},"score":1,"resource":{"primary":{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/10.1002\/adma.202501669"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,4]]},"references-count":48,"journal-issue":{"issue":"24","published-print":{"date-parts":[[2025,6]]}},"alternative-id":["10.1002\/adma.202501669"],"URL":"https:\/\/doi.org\/10.1002\/adma.202501669","archive":["Portico"],"relation":{},"ISSN":["0935-9648","1521-4095"],"issn-type":[{"value":"0935-9648","type":"print"},{"value":"1521-4095","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,4]]},"assertion":[{"value":"2025-01-23","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-04-01","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"2501669"}}