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

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

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

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.

本文言語英語
ホスト出版物のタイトルPlasmonics
ホスト出版物のサブタイトルMetallic Nanostructures and Their Optical Properties VI
7032
DOI
出版ステータス出版済み - 11 21 2008
外部発表はい
イベントPlasmonics: Metallic Nanostructures and Their Optical Properties VI - San Diego, CA, 米国
継続期間: 8 10 20088 14 2008

その他

その他Plasmonics: Metallic Nanostructures and Their Optical Properties VI
Country米国
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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