Fig. 2
k-vector resolved Fourier imaging of single CdSe quantum rings. a, b Calculated k-vector resolved emission pattern of a TDM lying vertically a and horizontally b on a sample plane. The critical angle (θC) and the angle determined by the numerical aperture (θNA) are indicated. c Schematic of angle-resolved photoluminescence spectroscopy on a Fourier imaging system. d, e Measured radiation patterns of QRs highlighted in f. f A scanning photoluminescence image used to locate single QRs. Scale bar: 2 µm. g, h Calculated radiation patterns of QRs with their azimuthal angles adjusted to match those in d and e. i k-vector resolved emission profiles from experimentally measured (dots) and calculated (curve) radiation patterns
