Alonso Orts, ManuelCarrasco Madrigal, DanielSan Juan, José M.Nó, Maria L.Andrés, Alicia deNogales Díaz, EmilioMéndez Martín, María Bianchi2023-06-162023-06-162022-03-28978-1-5106-4875-310.1117/12.2618319https://hdl.handle.net/20.500.14352/2475©2022 Conference on Oxide-Based Materials and Devices (13. 2022. San Francisco) ISSN 0277-786X This work has been supported by MICINN projects (RTI2018-097195-B-I00 and RTI2018-096918-B-C41). The authors also acknowledge the support from the Air Force Office of Scientific Research under Award No. FA865520-1-7013 (Program Manager: Ali Sayir).In this work, we present our recent results on the applicability of optical microcavities based on Cr doped Ga_2O_3 wires to operate as a nanothermometer in a wide temperature range (at least from 150 up to 550 K) and achieving a temperature precision of around 1 K. To this purpose, DBR (distributed Bragg reflectors) have been used to enhance the reflectivity at the lateral ends of the wires. The transduction mechanism encompasses both the luminescence features of the characteristic R-lines of Cr^(3+) ions in this host as well as the interferometric effects of the Fabry-Perot resonances within the cavity.engbook parthttp://dx.doi.org/10.1117/12.2618319https://www.spiedigitallibrary.org/open access538.9Gallium oxideDBR microcavitiesCr ion levelsTemperature sensorFísica de materialesFísica del estado sólido2211 Física del Estado Sólido