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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2025-08-21 0:49 |
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Conference: Bucharest University Faculty of Physics 2025 Meeting
Section: Solid State Physics and Materials Science
Title:
Optical Characterization of Barium Magnesium Tantalate Thin
Films Deposited
Authors:
Andrei Paul BORSOS (1), Ovidiu TOMA (1), Valentin ION (2)
*
Affiliation:
1) University of Bucharest, Faculty of Physics, Str. Atomistilor, nr. 405,Magurele, Ilfov, Romania
2) National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, Magurele City, Ilfov County,
077125 Bucharest, Romania
E-mail
borsos.andrei.paul100@gmail.com
Keywords:
BMT thin films, ellipsometry, optical properties, PLD
Abstract:
Barium magnesium tantalate (BMT), a complex perovskite oxide, has garnered interest because of promising dielectric and optical properties, making it a candidate for advanced electronic and photonic applications. In this study, BMT thin films were deposited on various substrates using pulsed laser deposition (PLD) using a solid-state Nd: YAG laser (266 nm) , including Si, PtSi and Al2O3 to investigate the influence of deposition parameters on their optical behavior. The films were grown under varying substrate temperatures and oxygen partial pressures to assess the impact of these conditions on film properties. Spectroscopic ellipsometry was employed to extract the refractive index (n) and extinction coefficient (k) across a broad spectral range and other physical properties such as thickness, band gap etc . The values of the refractive index were between 1.9 and 2.35 in the visible spectrum and the extinction factor had
values close to 0 in the visible spectrum and with an abrupt increase in the UV range. The optical constants exhibited dependence on deposition parameters higher temperatures of substrate during the deposition yielded thin films with higher refractive indexes. Moreover, substrate type played a critical role in film-substrate interface quality, influencing film texture and optical response.
The findings highlight the tunability of BMT thin film optical properties through careful control of PLD parameters showcasing correlations between growth conditions and functional properties.
References:
References:
[1] Scarisoreanu, N. D., Galca, A. C., Nedelcu, L., Ioachim, A., Toacsan, M. I., Morintale, E., Stoica, S.
D., & Dinescu, M. (2010). Optical and structural studies on Ba(Mg₁/₃Ta₂/₃)O₃ thin films obtained by
radiofrequency assisted pulsed plasma deposition. Applied Surface Science, 256(22), 6526–6530.
https://doi.org/10.1016/j.apsusc.2010.04.041
[2]Zhang, W. F., He, H. Y., Yin, Z. W., & Zhang, M. S. (1999). Structural and optical properties of
Ba(Mg₁/₃Ta₂/₃)O₃ thin films prepared by pulsed laser deposition. Journal of Physics D: Applied Physics,
32(19), 2475–2477. https://doi.org/10.1088/0022-3727/32/19/302
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