Wide dynamic range thermometer based on luminescent optical cavities in Ga_2O_3: Cr nanowires

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Alonso Orts, Manuel and Carrasco, Daniel and San Juan, José M. and Nó, María Luisa and Andrés, Alicia de and Nogales Díaz, Emilio and Méndez Martín, Bianchi (2021) Wide dynamic range thermometer based on luminescent optical cavities in Ga_2O_3: Cr nanowires. Small . ISSN 1613-6829

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Official URL: http://dx.doi.org/10.1002/smll.202105355




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.


Item Type:Article
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© 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).

Uncontrolled Keywords:CR3+; Distributed bragg reflector optical cavity; Fabry-Perot resonances; Gallium oxide; Wide range thermometer
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:69202
Deposited On:20 Dec 2021 12:24
Last Modified:20 Dec 2021 12:45

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