168437 20260205155159.0 doi 10.3390/jfb17010038 sideral 147899 ART-2026-147899 eng Sola, Daniel (orcid)0000-0002-5998-2251 Polarization Dependence on the Optical Emission in Nd-Doped Bioactive W-TCP Coatings 2026 Neodymium-doped bioactive wollastonite–tricalcium phosphate (W-TCP:Nd) coatings were fabricated by combining dip-coating and laser floating zone (LFZ) techniques to investigate the dependence of optical emission on polarization. Structural and spectroscopic analyses were performed on both longitudinal and transversal sections of the coating to assess the effects of directional solidification on luminescence and vibrational behavior. Micro-Raman spectroscopy revealed that the coating exhibited sharp, well-defined peaks compared to the W-TCP:Nd glass, confirming its glass-ceramic nature. New Raman modes appeared in the longitudinal section, accompanied by red and blue shifts in some bands relative to the transversal section, suggesting the presence of anisotropic stress and orientation-dependent crystal growth. Optical emission measurements showed that while the 4F3/2→4I11/2 transition near 1060 nm was nearly polarization independent, the 4F3/2→4I9/2 transition around 870–900 nm exhibited strong polarization dependence with notable Stark splitting. The relative intensity and spectral position of the Stark components varied systematically with the rotation of the emission polarization. These findings demonstrate that directional solidification induces polarization-dependent optical behavior, indicating potential applications for polarization-sensitive optical tracking and sensing in bioactive implant coatings. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/DGA/T02-23R info:eu-repo/semantics/openAccess by https://creativecommons.org/licenses/by/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Chueca, Eloy Peña, José Ignacio Universidad de Zaragoza (orcid)0000-0003-2242-6822 5001 065 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Cienc.Mater. Ingen.Metal. 17, 38 (2026), 11 J. funct. biomater. Journal of Functional Biomaterials 2079-4983 1724460 http://zaguan.unizar.es/record/168437/files/texto_completo.pdf Versión publicada 2357398 http://zaguan.unizar.es/record/168437/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:168437 articulos driver 2026-02-05-14:36:34 ARTICLE