Alonso Orts, ManuelChilla, GerwinHötzel, RudolfoNogales Díaz, EmilioSan Juan, José M.Nó, Maria L.Eickhoff, MartinMéndez Martín, María Bianchi2023-06-172023-06-172021-01-150146-959210.1364/OL.410757https://hdl.handle.net/20.500.14352/7821©2021 Optical Society of America This work has been supported by MINECO projects M-ERA.NET PCIN-2017-106 and RTI2018-097195-BI00. M. A-O acknowledges financial support from MICINN (FPU contract No. FPU15/01982), including finance for his short stay at Bremen University. This work made use of the FIB facilities from the SGIKER of the UPV/EHU. The authors also thank the Air Force Office of Scientific Research (Grant: FA8655-20-1-7013).In this Letter, we report optical confinement in the near-ultraviolet (near-UV) range in Ga2O3 nanowires (NWs) by distributed Bragg reflector (DBR) nanopatterned cavities. High-contrast DBRs, which act as the end mirrors of the cavities of the desired length, are designed and fabricated by focused ion beam etching. The resonant modes of the cavities are analyzed by micro-photoluminescence measurements, analytical models, and simulations, which show very good agreement between each other. Experimental reflectivities up to 50% are obtained over the 350-410 nm region for the resonances in this wavelength range. Therefore, Ga2O3 NW optical cavities are shown as good candidates for single-material-based near-UV light emitters.engjournal articlehttp://dx.doi.org/10.1364/OL.410757https://www.osapublishing.orgopen access538.9OpticsFísica de materialesFísica del estado sólido2211 Física del Estado Sólido