(color online) Three-dimensional polar plots of transition dipole moments of different energy states of ground state exciton for different magnitudes of LH–HH mixing and . The sum represents the total oscillator strength of . For , no exciton state is completely dark for nonzero magnitude of LH–HH mixing. The and are bright with different intensities and directions of polarization along the growth direction of the QD. The intensities of these states increase with an increase in the LH character of the hole state. The and are bright with different intensities and directions of polarization not normal to each other in the growth-plane of the QD. The intensity of decreases with increasing LH character and becomes completely dark when the LH character is 75%. Thereafter it increases again with an increase in LH character in the hole state. The intensity of decreases with an increase in LH character in the hole state.