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Unidirectional inter\u2010modal scattering, enabled by either acousto\u2010optic or electro\u2010optic (EO) modulation, is a promising method in this category as it can directly modify optical dispersions and even enables linear nonreciprocal photonic devices in the strong coupling limit. Although EO approaches are often preferred for their practicality, it is challenging to generate the large spatiotemporal momentum required for inter\u2010modal phase matching without EO drive schemes involving multiple drive stimuli. Here, we demonstrate highly selective nonreciprocal inter\u2010modal EO scattering enabled by a single high\u2010index radiofrequency (RF) traveling wave stimulus. Our experimental demonstration is performed on a thin\u2010film lithium niobate\u2010integrated photonics platform in which we engineer a slow\u2010wave radiofrequency (SWRF) transmission line with an effective RF index  that natively generates the required RF momentum while simultaneously maintaining strong RF\u2010optical mode overlap. By additionally engineering the interaction length, we achieve a directional  dB nonreciprocal scattering contrast. The SWRF architecture provides a scalable route to magnetic\u2010free nonreciprocity and establishes momentum\u2010engineered RF waves as a powerful tool for next\u2010generation, fully integrated nonreciprocal photonic systems.<\/jats:p>","DOI":"10.1002\/nap2.70170","type":"journal-article","created":{"date-parts":[[2026,6,19]],"date-time":"2026-06-19T14:50:48Z","timestamp":1781880648000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Nonreciprocal Electro\u2010Optic Intermodal Scattering With Momentum Engineered RF Waves"],"prefix":"10.1002","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9100-4100","authenticated-orcid":false,"given":"Jieun","family":"Yim","sequence":"first","affiliation":[{"name":"Department of Mechanical Science &amp; Engineering University of Illinois at Urbana\u2013Champaign  Urbana Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gwan In","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Electrical &amp; Computer Engineering University of Illinois at Urbana\u2013Champaign  Urbana Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Violet","family":"Workman","sequence":"additional","affiliation":[{"name":"Department of Physics University of Illinois at Urbana\u2013Champaign  Urbana Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seho","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Electrical &amp; Computer Engineering University of Illinois at Urbana\u2013Champaign  Urbana Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Omar A.","family":"Barrera","sequence":"additional","affiliation":[{"name":"Department of Electrical &amp; Computer Engineering The University of Texas at Austin  Austin Texas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruochen","family":"Lu","sequence":"additional","affiliation":[{"name":"Department of Electrical &amp; Computer Engineering The University of Texas at Austin  Austin Texas USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7801-2739","authenticated-orcid":false,"given":"Gaurav","family":"Bahl","sequence":"additional","affiliation":[{"name":"Department of Mechanical Science &amp; Engineering University of Illinois at Urbana\u2013Champaign  Urbana Illinois USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,6,19]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1103\/physrev.137.a448"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.95894"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1063\/1.2884855"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1364\/oe.19.011740"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1038\/nphoton.2011.270"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010020\u201000711\u20109"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010021\u201000884\u2010x"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010021\u201000882\u2010z"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010022\u201001026\u20107"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1038\/s41566\u2010023\u201001227\u20108"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1364\/ol.512220"},{"key":"e_1_2_8_13_1","article-title":"An Integrated Multi\u2010THz Tunable Linear Isolator Based on Electro\u2010Optic Non\u2010Reciprocal Strong Coupling","author":"Kim G. 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