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Recent advances on single photon sources based on single colloidal nanocrystals

De Vittorio M., Pisanello F., Martiradonna L., Qualtieri A., Stomeo T., Bramati A., Cingolani R.

Opto-Electronics Review

2010

Vol. 18, No. 1

1-9

Single colloidal quantum dots (QDs) are increasingly exploited as triggered sources of single photons. This review reports on recent results on single photon sources (SPS) based on colloidal quantum dots, whose size, shape and optical properties can be finely tuned by wet chemistry approach. First, we address the optical properties of different colloidal nanocrystals, such as dots, rods and dot in rods and their use as single photon sources will be discussed. Then, we describe different techniques for isolation and positioning single QDs, a major issue for fabrication of single photon sources, and various approaches for the embedding single nanocrystals inside microcavities. The insertion of single colloidal QDs in quantum confined optical systems allows one to improve their overall optical properties and performances in terms of efficiency, directionality, life time, and polarization control. Finally, electrical pumping of colloidal nanocrystals light emitting devices and of NC-based single photon sources is reviewed.

Transmission electron microscopy of In(Ga)As quantum dot structure

Kątcki J., Ratajczak J., Łaszcz A., Phillipp F., Paranthoen C., Cheng X. L., Fiore A., Passaseo A., Cingolani R.

Electron Technology : Internet Journal

2003

Vol. 35, nr 4

1-6

The application of transmission electron microscopy (TEM) to the investigation of In(Ga)As quantum dot (QD) structures grown on GaAs substrates is reviewed. Using various examples of the QD structures the advantages of using TEM for the analysis of QDs are presented. From plan-view TEM images the areal density of dots can be determined in real structures where QDs are embedded in the structure. Cross-sectional TEM images inform us about the real geometry of the structure, the shape, width and height as well as the distribution of QDs. It is especially useful for the investigations of multilayer QD structures.