Nogales Díaz, EmilioMéndez Martín, María BianchiPiqueras De Noriega, Francisco Javier2023-06-202023-06-202011-070304-399110.1016/j.ultramic.2011.03.003https://hdl.handle.net/20.500.14352/44083© 2011 ElsevierB.V. This work has been supported by MEC (projects MAT2006- 01259, MAT2009-07882 and Consolider Ingenio CSD 2009-00013) and BSCH-UCM (Group 910146).Cathodoluminescence (CL) of Ga2O3 nanowires and planar microstructures has been studied in a scanning electron microscope, as a function of the orientation angle of the structures relative to the position of the light detection system in the microscope chamber. CL contrast shows a marked dependence on the detection angle due to the waveguiding behaviour of the structures. The angle resolved cathodoluminescence (ARCL) measurements enable to evaluate the optical losses of guided blue-ultraviolet light in nanowires with diameters in the sub-wavelength range, deposited on graphite tape or silicon. In planar, branched feather-like microstructures, ARCL images demonstrate the directional-dependant light guiding behaviour of the nano-branches. (engjournal articlehttp://www.sciencedirect.com/science/article/pii/S0304399111000891http://www.sciencedirect.comopen access538.9Beta-Ga_2O_3 NanowiresGa_2O_3 FilmsFísica de materiales