We propose the optical control of the coupling between vertically aligned d
ouble dots. The coupling of the dots depends on the distance between the do
uble dots and affects the strength of the electron-electron interaction in
the dots. For this purpose, we fabricated a vertically aligned double dot a
rray using a modulation-doped GaAs/AlGaAs single quantum well with two inte
rfaces. Far-infrared magneto-optical absorption measurements of the double
dot array system were carried out under photoexcitation. We observed a peak
shift of the electron transition only in a dot located near the top interf
ace. The peak shift includes the change in the coupling as well as the chan
ge in the confinement potential by the photoexcitation. This is evidence of
the potential modulation by light which changes the coupling between the t
wo dots. This indicates the possibility of the optical control of the coupl
ing.