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We demonstrate the coherent transfer and on-demand retrieval of quantum state of telecom-wavelength ultrabroadband single photon pulse (terahertz range) to a collective excitation of a large number of quantum dots using photon-echo technique. The large inhomogeneous broadening of exciton energies in quantum dots, in conjunction with photon-echo technique, enables us to increase the acceptable spectral...
We examine autonomous optical excitation transfer in mixtures of different-sized quantum dots networked via optical near-fields at the nanometer scale. We theoretically and experimentally demonstrate optical excitation transfer via the network of optical near-field interactions among quantum dots. The topology-dependent efficiency of excitation transfer is also investigated. The results of our analysis...
We report on the intraband relaxation properties of photoexcited carriers in ordinary stacked quantum dots (QDs) as well as QD chains in which QDs are interconnected along the growth direction. We found that the effect of lateral coupling on the intraband relaxation process in the stacked QD sample is less than that in the QD chain sample. This affection depends on the exciton lifetime. However, by...
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