{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T00:27:42Z","timestamp":1767832062799,"version":"3.49.0"},"reference-count":46,"publisher":"MDPI AG","issue":"8","license":[{"start":{"date-parts":[[2021,7,31]],"date-time":"2021-07-31T00:00:00Z","timestamp":1627689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003336","name":"Bulgarian National Science Fund","doi-asserted-by":"publisher","award":["\u041a\u041f-06-\u041d38\/15"],"award-info":[{"award-number":["\u041a\u041f-06-\u041d38\/15"]}],"id":[{"id":"10.13039\/501100003336","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003336","name":"Bulgarian National Science Fund","doi-asserted-by":"publisher","award":["M38\/2"],"award-info":[{"award-number":["M38\/2"]}],"id":[{"id":"10.13039\/501100003336","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Photonics"],"abstract":"<jats:p>We employ two approaches to tune the properties of concurrently inscribed volume polarization and surface relief gratings in nanocomposite thin films containing the azopolymer PAZO (poly[1-4-(3-carboxy-4-hydrophenylazo)benzensulfonamido]-1,2-ethanediyl, sodium salt]) and goethite (\u03b1-FeOOH) nanorods. The first one is applied on the stage of sample preparation by varying the concentration of the goethite nanorods from 0% to 15%. Then, different angles between the recording beams are set in the holographic scheme, which allow us to obtain gratings with spatial periods in the range from 0.86 to 2.51 \u00b5m. Surface relief modulation close to 300 nm is achieved as well as total diffraction efficiency in the \u00b11 diffracted orders of more than 50%. The influence of the incorporated goethite nanorods on the properties of both volume birefringence and the surface relief grating are discussed.<\/jats:p>","DOI":"10.3390\/photonics8080306","type":"journal-article","created":{"date-parts":[[2021,8,1]],"date-time":"2021-08-01T21:44:32Z","timestamp":1627854272000},"page":"306","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Tunable Polarization and Surface Relief Holographic Gratings in Azopolymer Nanocomposites with Incorporated Goethite (\u03b1-FeOOH) Nanorods"],"prefix":"10.3390","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5452-3868","authenticated-orcid":false,"given":"Lian","family":"Nedelchev","sequence":"first","affiliation":[{"name":"Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]},{"given":"Georgi","family":"Mateev","sequence":"additional","affiliation":[{"name":"Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7807-4833","authenticated-orcid":false,"given":"Velichka","family":"Strijkova","sequence":"additional","affiliation":[{"name":"Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9396-468X","authenticated-orcid":false,"given":"Ver\u00f3nica","family":"Salgueiri\u00f1o","sequence":"additional","affiliation":[{"name":"Centro de Investigaciones Biom\u00e9dicas (CINBIO), Departamento de F\u00edsica Aplicada, Universidade de Vigo, 36310 Vigo, Spain"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8894-4043","authenticated-orcid":false,"given":"David S.","family":"Schmool","sequence":"additional","affiliation":[{"name":"Groupe d\u2019\u00c9tude de la Mati\u00e8re Condens\u00ede (GEMaC), Centre National de la Recherche Scientifique (CNRS), D\u00e9partement des Sciences Physiques, Universit\u00e9 de Versailles\/Saint-Quentin, Universit\u00e9 Paris-Saclay, 78000 Versailles, France"}]},{"given":"Nataliya","family":"Berberova-Buhova","sequence":"additional","affiliation":[{"name":"Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]},{"given":"Elena","family":"Stoykova","sequence":"additional","affiliation":[{"name":"Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2040-6043","authenticated-orcid":false,"given":"Dimana","family":"Nazarova","sequence":"additional","affiliation":[{"name":"Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria"}]}],"member":"1968","published-online":{"date-parts":[[2021,7,31]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Lalanne, P., and Chavel, P. 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