| 摘要 |
A composite quantum dot structure 4 comprises a charge carrier confinement region, such as a quantum dot 2, a barrier 5 and an electrically conductive layer 3. This structure allows the dimensions of the conductive layer 3 to be substantially independent of the size of the region 2, so that the dimensions of the region 2 can thus be selected in order to achieve desired optical properties, while the electrically conductive layer 3 can be of sufficient thickness to ensure that it can be reliably deposited. The structure may also include a cladding layer 7 (Figure 4) to compensate for any lack of chemical affinity between the barrier 5 and conductive layer 3. An ensemble of such structures be provided in which the quantum dots 1 have various radii but the dimensions of the conductive layers 3 and the overall dimensions of the structures are substantially uniform, e.g. for use in an amplifier configured to amplify light of various wavelengths. ® KIPO & WIPO 2007
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