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Summary form only given. Nanoscale structures can be tailored to provide enhanced, nanoscale near-field optics. For example, high-quality GaAs quantum dots can be fabricated by self-formed growth near the apex of AlGaAs tetrahedral pyramids. Photoluminescence studies have shown a thousand-fold enhancement of the far-field emission of an embedded quantum dot. This large enhancement arises because the...
Summary form only given, as follows. In recent years there have been significant advances in the preparation of semiconductor quantum dots by colloidal chemistry routes. CdSe and InAs are examples of materials which can be made as nanocrystals of high quality. These nanocrystals provide an excellent proving ground for examining size dependent scaling laws, and a few examples are described briefly...
Summary form only given. We have developed a novel QD microcavity by coupling core/shell semiconductor nanocrystals resonantly to whispering gallery modes (WGMs) of a silica microsphere. We have shown that this composite microcavity system features a photon lifetime of order 0.1 Js, corresponding to Q-factors of order 10/sup 8/, four to five orders of magnitude greater than that of other semiconductor...
Summary form only given. The existence of quantum confinement in semiconductor nanocrystals allows to regard them as nanocavities for the electronic wavefunctions. The quantization of energy levels inside such nanocrystals results in quantization of the corresponding optical transitions. In fact, the absorption and photoluminescence spectra of various semiconductor nanocrystals possess rather a molecular-like...
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