Non-linear Spectroscopy of Solids Doped with Rare Earth ions

• Grant number: 17/16392-6
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: August 01, 2018
• End date: May 02, 2021
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Tomaz Catunda
• Grantee: Vitor Santaella Zanuto
• Host Institution: Instituto de Física de São Carlos (IFSC). Universidade de São Paulo (USP). São Carlos , SP, Brazil

Abstract

The main objective is the study of nonlinear refractive index spectroscopy (n2) in rare earth doped solids by the time-resolved Z-scan technique in which our group specialized. In addition, we propose the Z-scan method of luminescence, which seems very promising for the quantitative study of luminescence saturation or any nonlinear mechanisms involving, for example, energy transfer mechanisms (photon avalanches, upconversion, downconversion, etc.). In this way, we intend to continue the detailed study of the polarizability difference (Dap), between excited and fundamental ion states, in doped materials. The value of Dap can be obtained from measurements of n2 using the Z-scan method. To investigate the physical origin of Dap, it is sought to correlate it with other parameters of conventional spectroscopy and excited state absorption. The plan also explores the fact that the 4fn’4fn-15d transitions of rare earth ions are very sensitive to the crystalline field, as opposed to the transitions between the 4fn levels. Consequently, the Dap value can be used as a spectroscopic probe for effects of small changes in the crystalline field such as small variations in the composition of the glass matrix, phase transitions, doping effects, etc. This is demonstrated in some recent results of the group, which we believe open a wide field of research to be explored.

Scientific publications

(4)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FLIZIKOWSKI, G. A. S.; ZANUTO, V. S.; NUNES, L. A. O.; BAESSO, M. L.; MALACARNE, L. C.; ASTRATH, N. G. C.. Standard and modified Judd-Ofelt theories in Pr3+-doped calcium aluminosilicate glasses: A comparative analysis. Journal of Alloys and Compounds, v. 780, p. 705-710, APR 5 2019. (17/16392-6)

DOS SANTOS, J. F. M.; ZANUTO, V. S.; VENTURA, M.; BRAMORSKI, C. B.; CATUNDA, T.; MANOEL, D. S.; MALACARNE, L. C.; DE VICENTE, F. S.. Quantum yield measurements by thermal lens in highly absorbing samples: The case of highly doped rhodamine B organic/silica xerogels. PHYSICAL REVIEW MATERIALS, v. 3, n. 11, NOV 4 2019. (17/16392-6)

ZANUTO, V. S.; CAPELOTO, O. A.; MUNIZ, R. F.; SANDRINI, M.; ROHLING, J. H.; BAESSO, M. L.; NUNES, L. A. O.. Two ratiometric thermometry methods based on the interplay between Eu2+ and Eu3+ and single Eu3+ emissions on OH--free low-silica calcium aluminosilicate glass. Materials Research Bulletin, v. 135, MAR 2021. (17/16392-6)

ZANUTO, V. S.; ROCHA, A. C. P.; DOS SANTOS, J. F. M.; KESAVULU, C. R.; SILVA, A. C. A.; DANTAS, N. O.; MONCORGE, R.; CATUNDA, T.. Time-resolved study of pump-induced refractive index changes in Tb3+-doped phosphate glasses: Discrimination of electronic and thermal contributions. Optical Materials, v. 142, p. 8-pg., 2023-06-24. (17/16392-6)