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The optical characterization of mono\u2010 and few\u2010layer samples of hBN however, remains a challenge as the material is almost invisible optically. Here, phase\u2010resolved sum\u2010frequency microscopy is introduced as a technique for imaging monolayers of hBN grown by chemical vapor deposition (CVD) and visualizing their crystal orientation. Femtosecond mid\u2010infrared (IR) and visible laser pulses are used for sum\u2010frequency generation (SFG), which is imaged in a wide\u2010field optical microscope. The IR laser resonantly excites a phonon of hBN that leads to an \u2248800\u2010fold enhancement of the SFG intensity, making it possible to image large 100\u00a0\u00d7\u00a0100\u00a0\u00b5m\n                    <jats:sup>2<\/jats:sup>\n                    sample areas in less than 1 s. Heterodyne detection combined with azimuthal sample rotation further provides full crystallographic information. Combined knowledge of topography and crystal orientation reveals that triangular domains of CVD\u2010grown monolayer hBN have nitrogen\u2010terminated zigzag edges. Overall, SFG microscopy is an ultra\u2010sensitive tool with the potential to image crystal structure, strain, stacking sequences, and twist angles in a wide range of van der Waals structures, where locating and identifying monolayer regions and interfaces with broken inversion symmetry is of paramount importance.\n                  <\/jats:p>","DOI":"10.1002\/adma.202510124","type":"journal-article","created":{"date-parts":[[2025,11,21]],"date-time":"2025-11-21T07:09:03Z","timestamp":1763708943000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Full Crystallographic Imaging of Hexagonal Boron Nitride Monolayers with Phonon\u2010Enhanced Sum\u2010Frequency Microscopy"],"prefix":"10.1002","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8688-1974","authenticated-orcid":false,"given":"Niclas S.","family":"Mueller","sequence":"first","affiliation":[{"name":"Department of Physical Chemistry 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C.Paiva M.Frenzel M. S.Spencer J. M.Urban C.Ringkamp M.Wolf G.Mussler D. M.Juraschek S. F.Maehrlein arXiv Preprint2025 arXiv:2503.11626."},{"key":"e_1_2_9_52_1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.84.4653"},{"key":"e_1_2_9_53_1","author":"Chaturvedi P.","year":"2025","journal-title":"Adv. Mater."}],"container-title":["Advanced Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/adma.202510124","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/full-xml\/10.1002\/adma.202510124","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/adma.202510124","content-type":"application\/pdf","content-version":"vor","intended-application":"syndication"},{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/adma.202510124","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,2,2]],"date-time":"2026-02-02T10:28:47Z","timestamp":1770028127000},"score":1,"resource":{"primary":{"URL":"https:\/\/advanced.onlinelibrary.wiley.com\/doi\/10.1002\/adma.202510124"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,11,20]]},"references-count":53,"journal-issue":{"issue":"7","published-print":{"date-parts":[[2026,2]]}},"alternative-id":["10.1002\/adma.202510124"],"URL":"https:\/\/doi.org\/10.1002\/adma.202510124","archive":["Portico"],"relation":{},"ISSN":["0935-9648","1521-4095"],"issn-type":[{"value":"0935-9648","type":"print"},{"value":"1521-4095","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,11,20]]},"assertion":[{"value":"2025-05-28","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2025-11-20","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}],"article-number":"e10124"}}