Nanoscale Relative Emission Efficiency Mapping Using Cathodoluminescence g(2) Imaging.

ABSTRACT: Cathodoluminescence (CL) imaging spectroscopy provides two-dimensional optical excitation images of photonic nanostructures with a deep-subwavelength spatial resolution. So far, CL imaging was unable to provide a direct measurement of the excitation and emission probabilities of photonic nanostructures in a spatially resolved manner. Here, we demonstrate that by mapping the cathodoluminescence autocorrelation function g(2) together with the CL spectral distribution the excitation and emission rates can be disentangled at every excitation position. We use InGaN/GaN quantum wells in GaN nanowires with diameters in the range 200-500 nm as a model system to test our new g(2) mapping methodology and find characteristic differences in excitation and emission rates both between wires and within w

SUBMITTER: Meuret S 

PROVIDER: S-EPMC5897862 | biostudies-literature | 2018 Apr

REPOSITORIES: biostudies-literature