Spectroscopy of long wavelength coupled quantum dots

We obtained a low density of coupled InAs/GaAs quantum dots (QDs) with an emission wavelength of around 1.3 mu m at room temperature. Atomic force microscopy and transmission electronic microscopy reveal that the dot size difference and the lateral displacement between the two dots are related to the spacer thickness. Spectroscopy of the coupled QD ensembles is considerably influenced by the spacer thickness.

National Natural Science Foundation of China 60625405 10734060National Basic Research Program of China 2006CB921504 This work is supported by the National Natural Science Foundation of China (Grant Nos 60625405, 10734060) and the National Basic Research Program of China (Grant No 2006CB921504)