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In this work, the authors demonstrate how hBN slabs tuned to the correct thickness act as optical waveguides, enabling direct optical coupling of light emission from encapsulated layers into waveguide modes. Molybdenum selenide (MoSe\n                    <jats:sub>2<\/jats:sub>\n                    ) and tungsten selenide (WSe\n                    <jats:sub>2<\/jats:sub>\n                    ) are integrated within hBN\u2010based waveguides and demonstrate direct coupling of photoluminescence emitted by in\u2010plane and out\u2010of\u2010plane transition dipoles (bright and dark excitons) to slab waveguide modes. Fourier plane imaging of waveguided photoluminescence from MoSe\n                    <jats:sub>2<\/jats:sub>\n                    demonstrates that dry etched hBN edges are an effective out\u2010coupler of waveguided light without the need for oil\u2010immersion optics. Gated photoluminescence of WSe\n                    <jats:sub>2<\/jats:sub>\n                    demonstrates the ability of hBN waveguides to collect light emitted by out\u2010of\u2010plane dark excitons.Numerical simulations explore the parameters of dipole placement and slab thickness, elucidating the critical design parameters and serving as a guide for novel devices implementing hBN slab waveguides. The results provide a direct route for waveguide\u2010based interrogation of layered materials, as well as a way to integrate layered materials into future photonic devices at arbitrary positions whilst maintaining their intrinsic properties.\n                  <\/jats:p>","DOI":"10.1002\/adma.202309777","type":"journal-article","created":{"date-parts":[[2023,11,23]],"date-time":"2023-11-23T09:48:01Z","timestamp":1700732881000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Hexagonal Boron Nitride Slab Waveguides for Enhanced Spectroscopy of Encapsulated 2D Materials"],"prefix":"10.1002","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8739-9621","authenticated-orcid":false,"given":"Samuel W.","family":"LaGasse","sequence":"first","affiliation":[{"name":"Electronics Science and Technology Division US Naval Research Laboratory  Washington DC 20375 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4307-7537","authenticated-orcid":false,"given":"Nicholas V.","family":"Proscia","sequence":"additional","affiliation":[{"name":"NRC Postdoctoral Fellow residing at the US Naval Research Laboratory  Washington DC 20375 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7563-6693","authenticated-orcid":false,"given":"Cory D.","family":"Cress","sequence":"additional","affiliation":[{"name":"Electronics Science and Technology Division US Naval Research Laboratory  Washington DC 20375 USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7979-4661","authenticated-orcid":false,"given":"Jose J.","family":"Fonseca","sequence":"additional","affiliation":[{"name":"Electronics Science and Technology Division US Naval Research Laboratory  Washington DC 20375 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