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Direct observation of optical excitation transfer based on resonant optical near-field interaction

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Abstract

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.

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Acknowledgements

This work was financially supported by JST and DFG under the Strategic Japanese–German Cooperative Program, and by MEXT under the Special Coordination Funds for Promoting Science and Technology. T. Yatsui was financially supported by a Grant-in-Aid for Young Scientists (A) from MEXT, and by a research grant (Basic Research) from the TEPCO Memorial Foundation.

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Authors and Affiliations

  1. School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan

    W. Nomura, T. Yatsui, T. Kawazoe & M. Ohtsu

  2. The Nanophotonics Research Center, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan

    W. Nomura, T. Yatsui, T. Kawazoe & M. Ohtsu

  3. National Institute of Information and Communications Technology, 4-2-1 Nukui-kita, Koganei, Tokyo, 184-8795, Japan

    M. Naruse

  4. Institut für Physik, Technische Universität Ilmenau, 98693, Ilmenau, Germany

    E. Runge

  5. Institut für Physik, Carl von Ossietzky Universität, 26111, Oldenburg, Germany

    C. Lienau

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  1. W. Nomura
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  2. T. Yatsui
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  3. T. Kawazoe
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  4. M. Naruse
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  5. E. Runge
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  6. C. Lienau
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  7. M. Ohtsu
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Correspondence to W. Nomura.

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Nomura, W., Yatsui, T., Kawazoe, T. et al. Direct observation of optical excitation transfer based on resonant optical near-field interaction. Appl. Phys. B 107, 257–262 (2012). https://doi.org/10.1007/s00340-012-5009-6

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  • DOI: https://doi.org/10.1007/s00340-012-5009-6

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