APB

Post date: Mar 2, 2012 1:04:43 AM

W. Nomura, T. Yatsui, T. Kawazoe, M. Naruse, E. Runge, C. Lienau, and M. Ohtsu: Direct observation of optical excitation transfer based on resonant optical near-field interaction, Applied Physics B, Vol. 107, No. 2, pp. 257-262, May 2012. [doi]

This article reports the direct observation of long-distance optical excitation transfer based on resonant optical near-field interactions in randomly distributed quantum dots (QDs). We fabricated optical excitation transfer paths based on randomly distributed QDs by using CdSe/ZnS core–shell QDs and succeeded for the first time in obtaining output signals resulting from a unidirectional optical excitation transfer length of 2.4 μm. Furthermore, we demonstrate that the optical excitation transfer occurs via the resonant excited levels of the QDs with a comparative experiment using non-resonant QDs. This excitation-transfer mechanism allows for intersecting, non-interacting nano-optical wires.