High refractive index in wurtzite GaP measured from Fabry-Pérot resonances

Abstract

\u3cp\u3eWe investigate the optical emission of wurtzite GaP/Al\u3csub\u3e0.4\u3c/sub\u3eGa\u3csub\u3e0.6\u3c/sub\u3eP core/shell nanowires (NWs) transferred to a SiO\u3csub\u3ex\u3c/sub\u3e substrate to demonstrate a high degree of waveguiding of the emitted photoluminescence (PL) signal. By analysing the Fabry-Pérot mode spacing in combination with calculations of the guided modes in the NWs, we calculate a very high refractive index of bulk WZ GaP of 4.2 at a wavelength of 600 nm. The measured quality factors up to 600 indicate the excellent optical quality of the nanowire resonator.\u3c/p\u3