Dependence on the exact growth condition of the InAs/GaAs quantum lot emiss
ion polarisation has been tested for (100) and (311)A substrates. Polarised
emission, reproducible in intensity and direction and independent of the c
overage, has been achieved by self-assembling InAs quantum dots on (311)A G
aAs substrates only. The quantum dots emission is stably polarised along th
e [(2) over tilde 33] crystallographic direction with a polarisation ratio
of about 12%.