Publication: Wide dynamic range thermometer based on luminescent optical cavities in Ga_2O_3: Cr nanowires
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Publication Date
2021-11
Authors
Carrasco, Daniel
San Juan, José M.
Nó, María Luisa
Andrés, Alicia de
Méndez Martín, Bianchi
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Wiley-VCH
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Abstract
Remote temperature sensing at the micro- and nanoscale is key in fields such as photonics, electronics, energy, or biomedicine, with optical properties being one of the most used transducing mechanisms for such sensors. Ga_2O_3presents very high chemical and thermal stability, as well as high radiation resistance, becoming of great interest to be used under extreme conditions, for example, electrical and/or optical high-power devices and harsh environments. In this work, a luminescent and interferometric thermometer is proposed based on Fabry-Perot (FP) optical microcavities built on Cr-doped Ga_2O_3 nanowires. It combines the optical features of the Cr^(3+) -related luminescence, greatly sensitive to temperature, and spatial confinement of light, which results in strong FP resonances within the Cr^(3+) broad band. While the chromium-related R lines energy shifts are adequate for low-temperature sensing, FP resonances extend the sensing range to high temperatures with excellent sensitivity. This thermometry system achieves micron-range spatial resolution, temperature precision of around 1 K, and a wide operational range, demonstrating to work at least in the 150-550 K temperature range. Besides, the temperature-dependent anisotropic refractive index and thermo-optic coefficient of this oxide have been further characterized by comparison to experimental, analytical, and finite-difference time-domain simulation results.
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CRUE-CSIC (Acuerdos Transformativos 2021)
© 2021 Wiley-VCH GmbH
This work was supported by MICINN projects (RTI2018-097195-B-I00 and RTI2018-096918-B-C41). The authors acknowledge the financial support of the excellence research network MAT2016-81720-REDC, "RED IMAGINE" and project RED2018-102609-T by MINECO. The authors also acknowledge the use of the FIB facilities from the general services, SGIKER, of the University of the Basque Country. The authors also acknowledge the support from the Air Force Office of Scientific Research under Award No. FA8655-20-1-7013 (Program Manager: Ali Sayir). M.A-.O. acknowledges financial support from MICINN (FPU contract No. FPU15/01982).