Abstract

Self-assembled quantum dots (QDs) are highly interesting for fundamental experiments in quantum optics as well as for optical communication devices. A key parameter determining the interaction between QDs and optical fields is the optical transition dipole moment. Significant progress has been made to increase the dipole moment by engineering of the QD geometry whereby light-matter interaction is enhanced [1]. Unfortunately, the lack of an accurate technique for measuring the dipole moment has so far prevented a systematic study of the dipole moment. Here we present quantitative measurements of the dipole moment of an ensemble of self-assembled quantum dots employing a modified optical local density of states (LDOS). The LDOS is controlled by varying the distance from the QDs to a semiconductor/air interface.

© 2007 IEEE