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However, due to the strong reflectance required, their implementation with highly processable and metal\u2010free flexible materials has proven challenging. Herein, we develop the first structure supporting OTS based only on organic polymeric materials, demonstrating a photonic platform based on non\u2010critical, widely available and easily processable materials. The structures fabricated present large areas and consist of a narrowband multi\u2010layered polymeric distributed Bragg reflector (DBR) followed by a thin film of J\u2010aggregate molecular excitonic material that can act as a highly reflective surface within a narrowband range. We take advantage of the narrowband spectral response of the DBR and of the reflective molecular layer to tune the OTS band by varying the periodicity of the multilayer, opening the door for the fabrication of OTS structures based on lightweight integrable excitonic devices with cost\u2010effective procedures.<\/jats:p>","DOI":"10.1515\/nanoph-2022-0419","type":"journal-article","created":{"date-parts":[[2022,11,4]],"date-time":"2022-11-04T17:50:31Z","timestamp":1667584231000},"page":"4879-4888","source":"Crossref","is-referenced-by-count":9,"title":["Tunable narrowband excitonic Optical Tamm states enabled by a metal\u2010free all\u2010organic structure"],"prefix":"10.1002","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4152-185X","authenticated-orcid":false,"given":"Miguel","family":"Castillo","sequence":"first","affiliation":[{"name":"Faculty of Physics\/Faculty of Optics and Optometry Campus Vida S\/N University of Santiago de Compostela E\u201015782 Santiago de Compostela Galicia Spain"},{"name":"Natural and Artificial Photonic Structures and Devices Group INL\u2010International Iberian Nanotechnology Laboratory Braga 4715\u2010330 Portugal"}]},{"given":"Diogo","family":"Cunha","sequence":"additional","affiliation":[{"name":"Centro de F\u00edsica das Universidades do Minho e do Porto Laborat\u00f3rio de F\u00edsica Para Materiais e Tecnologias Emergentes (LaPMET) Universidade do Minho Braga 4710\u2010057 Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5043-6302","authenticated-orcid":false,"given":"Carla","family":"Est\u00e9vez\u2010Varela","sequence":"additional","affiliation":[{"name":"CINBIO Universidade de Vigo 36310 Vigo Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9784-3340","authenticated-orcid":false,"given":"Daniel","family":"Miranda","sequence":"additional","affiliation":[{"name":"Natural and Artificial Photonic Structures and Devices Group INL\u2010International Iberian Nanotechnology Laboratory Braga 4715\u2010330 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