The optical spectroscopic techniques utilizing semiconductor quantum dots were presented. The semiconductor dots were capable of being customized for various applications including fabrication of electrostatic gates. Optical technologies played an important role in controlling the electronic wavefunctions of the QDs. The size, shape and distribution of the QD arrays was manipulated and the control of electronic and nuclear spin was also made possible through QD spectroscopy. The research was applicable for creation of complex nanomaterials with customizable properties.