Polarization Dependence on the Optical Emission in Nd-Doped Bioactive W-TCP Coatings

Sola, Daniel ; Chueca, Eloy ; Peña, José Ignacio (Universidad de Zaragoza)

Resumen: 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.

Idioma: Inglés

DOI: 10.3390/jfb17010038

Año: 2026

Publicado en: Journal of Functional Biomaterials 17, 38 (2026), 11
ISSN: 2079-4983

Financiación: info:eu-repo/grantAgreement/ES/DGA/T02-23R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Cienc.Mater. Ingen.Metal. (Dpto. Ciencia Tecnol.Mater.Fl.)