Institute of Fundamental Technological Research
Polish Academy of Sciences

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Alexander Fedorov


Recent publications
1.  Markovskyi A., Rosiak M., Vitalii G., Fedorov A., Ciezko M., Szczepański Z., Yuriy Z., Kaczmarek M., Litniewski J., Pakuła M., Acoustic microscopy study on elasto-mechanical properties of Lu 3 Al 5 O 12 :Ce single crystalline films, CrystEngComm , ISSN: 1466-8033, DOI: 10.1039/D5CE00068H, pp.1-13, 2025

Abstract:
This article presents experimental, theoretical, and numerical studies of the propagation of guided ultrasonic waves in a layered epitaxial structure of garnet compounds. A microscopic model, which yields dispersion equations based on material and geometrical properties, is developed. Acoustic microscopy experiments on a YAG:Ce crystal substrate and an epitaxial structure containing LuAG:Ce single crystalline films, grown using the liquid phase epitaxy growth method onto a YAG:Ce crystal substrate, reveal distinct phase velocity behaviors. The YAG substrate exhibits consistent velocities, minimally influenced by frequency, while the epitaxial structure shows dispersion, indicating frequency-dependent phase velocities. Experimental results are compared with numerically calculated dispersion curves, showing high agreement in the low-frequency range and minor deviations at higher frequencies. An optimization procedure is developed and applied, starting with the YAG substrate and extending to the LuAG:Ce film/YAG:Ce crystal epitaxial structure. The procedure allows for the extraction of material properties, offering valuable insights into the mechanical characteristics of the all-solid-state LuAG:Ce film/YAG:Ce crystal structure. This research represents a significant advancement in understanding ultrasonic wave dynamics in layered structures, particularly unveiling previously unexplored elastic properties of LuAG:Ce single crystalline films as a well-known scintillation material.

Affiliations:
Markovskyi A. - other affiliation
Rosiak M. - other affiliation
Vitalii G. - other affiliation
Fedorov A. - other affiliation
Ciezko M. - other affiliation
Szczepański Z. - other affiliation
Yuriy Z. - other affiliation
Kaczmarek M. - Kazimierz Wielki University (PL)
Litniewski J. - IPPT PAN
Pakuła M. - other affiliation

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