Unidirectional signal transfer in quantum-dot systems via optical near-field interactions

W. Nomura, T. Yatsui, T. Kawazoe, M. Naruse, Naoya Tate, M. Ohtsu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To decrease the sizes of photonic devices beyond the diffraction limit of light, we propose nanophotonic devices based on optical near-field interactions between semiconductor quantum dots (QDs). To drive such devices, an optical signal guide whose width is less than several tens of nanometers is required. Furthermore, unidirectional signal transfer is essential to prevent nanophotonic devices operating incorrectly due to signals reflected from the destination. For unidirectional signal transfer at the nanometer scale, we propose a nanophotonic signal transmitter based on optical nearfield interactions between small QDs of the same size and energy dissipation in larger QDs that have a resonant exciton energy level with the small QDs. To confirm such unidirectional energy transfer, we used time-resolved photoluminescence spectroscopy to observe exciton energy transfer between the small QDs via the optical near-field, and subsequent energy dissipation in the larger QDs. We estimated that the energy transfer time between resonant CdSe/ZnS QDs was 135 ps, which is shorter than the exciton lifetime of 2.10 ns. Furthermore, we confirmed that exciton energy did not transfer between nonresonant QD pairs. These results indicated that the proposed nanophotonic signal transmitters based on optical near-field interactions and energy dissipation could be used to make multiple transmitters and selfdirectional interconnections.

Original languageEnglish
Title of host publicationPlasmonics
Subtitle of host publicationMetallic Nanostructures and Their Optical Properties VI
Volume7032
DOIs
Publication statusPublished - Nov 21 2008
Externally publishedYes
EventPlasmonics: Metallic Nanostructures and Their Optical Properties VI - San Diego, CA, United States
Duration: Aug 10 2008Aug 14 2008

Other

OtherPlasmonics: Metallic Nanostructures and Their Optical Properties VI
CountryUnited States
CitySan Diego, CA
Period8/10/088/14/08

All Science Journal Classification (ASJC) codes

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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  • Cite this

    Nomura, W., Yatsui, T., Kawazoe, T., Naruse, M., Tate, N., & Ohtsu, M. (2008). Unidirectional signal transfer in quantum-dot systems via optical near-field interactions. In Plasmonics: Metallic Nanostructures and Their Optical Properties VI (Vol. 7032). [703215] https://doi.org/10.1117/12.794380