RT Journal Article
T1 β-Ga2O3:Cr nanowires with optical microcavities for determining local heating induced by x-ray nanobeams
A1 Carrasco Madrigal, Daniel
A1 Dolado, J.
A1 Pérez Peinado, Paula
A1 Rodríguez Fernández, Beatriz
A1 Alonso Orts, Manuel
A1 San Juan, J. M.
A1 Nó, M. L.
A1 Hidalgo Alcalde, Pedro
A1 Martínez-Criado, G.
A1 Méndez Martín, María Bianchi
A1 Nogales Díaz, Emilio
AB This study explores the x-ray excited optical luminescence (XEOL) of optical microcavities fabricated in β-Ga2O3:Cr nanowires (NWs). XEOL measurements reveal prominent luminescence bands in the near ultraviolet-blue (NUV-B) and in the red-near infrared (R-NIR) spectral regions. The NUV-B emission originates from β-Ga2O3 defects, while the R-NIR band is attributed to Cr3+ intraionic transitions. Both spectral regions exhibit sharp resonances, which are analyzed as Fabry–Pérot and whispering gallery mode resonances. Exposure to x-ray nanobeam induces a redshift of the sharp R-NIR peaks, attributed to local temperature increase in the NWs caused by x-ray absorption. The influence of this temperature rise on the NUV-B peaks is also evaluated. In addition, the local temperature increase due to x-ray absorption is estimated through COMSOL finite-difference time-domain simulations, incorporating the material’s physical and thermal properties. This work demonstrates the application of β-Ga2O3:Cr optical microcavities as luminescence-based nanothermometers to probe the localized effects of x-ray nanobeam irradiation.
PB AIP Publishing
YR 2025
FD 2025-04-01
LK https://hdl.handle.net/20.500.14352/122375
UL https://hdl.handle.net/20.500.14352/122375
LA eng
NO D. Carrasco, J. Dolado, P. Pérez-Peinado, B. Rodríguez, M. Alonso-Orts, J.M. San Juan, M.L. Nó, P. Hidalgo, G. Martínez-Criado, B. Méndez, and E. Nogales, “β-Ga2O3:Cr nanowires with optical microcavities for determining local heating induced by x-ray nanobeams,” APL Materials 13(4), 041115 (2025).
NO ©Author(s) 2025INST 144/462-1 FUGGZF04/2021
NO Ministerio de Ciencia e Innovación (España)
NO Agencia Estatal de Investigación (España)
NO European Commission
NO Comunidad de Madrid
NO Universidad Complutense de Madrid
NO United States Department of the Air Force
NO Deutsche Forschungsgemeinschaft
NO University of Bremen
DS Docta Complutense
RD 17 jul 2025