RT info:eu-repo/semantics/article
T1 Improving the sensitivity of WGM pressure sensors with Oxyfluoride glass microspheres
A1 Soler Carracedo, Kevin
A1 Estévez Alonso, Pablo
A1 Martín Benenzuela, Inocencio Rafael
A1 Ríos, S.
A2 Física
A2 Instituto Universitario de Materiales y Nanotecnología (IMN)
AB Oxyfluoride glass microspheres doped Nd3+ were synthesized and calibrated to function asoptical pressure sensors. When the microspheres were placed in a vacuum chamber and excitedat 532 nm, Nd3+ typical emission spectrum was recorded. Due to the specific geometry of themicrospheres, that allow them to act as an optical resonator, it was also possible to recordWhispering Gallery Modes (WGM) superimposed to the Nd3+ typical emission spectrum.Furthermore, when decreasing pressure, changes in the Fluorescence Intensity Ratio (FIR) of the2H9/2,4F5/2→4I9/2 (820 nm) and 4F3/2→4I9/2 (890 nm) Nd3+ transitions as well as a red-shift of theWGM was observed. Both changes were calibrated as a function of pressure. Relative sensitivityand limit of detection were estimated for both techniques as a way of comparing theirperformance, also taking into account the previous results found in the literature. Due to the highthermal expansion and thermo-optical coefficient of oxyfluoride glasses and the high energy gapof Nd3+ thermally coupled levels, the sensor presented groundbreaking levels of relativesensitivity and limit of detection.
YR 2021
FD 2021
LK http://riull.ull.es/xmlui/handle/915/34577
UL http://riull.ull.es/xmlui/handle/915/34577
LA en
NO Ministerio de Ciencia e Innovación ofSpain (MICIIN) under the National Program of Sciences and Technological Materials (PID2019-106383GB-C44 and PID2019- 107335RA-I00)
DS Repositorio institucional de la Universidad de La Laguna
RD 12-may-2024