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Ultralow mode-volume photonic crystal nanobeam cavities for high-efficiency coupling to individual carbon nanotube emitters

Author

Listed:
  • R. Miura

    (Institute of Engineering Innovation, The University of Tokyo)

  • S. Imamura

    (Institute of Engineering Innovation, The University of Tokyo)

  • R. Ohta

    (Institute of Industrial Science, The University of Tokyo)

  • A. Ishii

    (Institute of Engineering Innovation, The University of Tokyo)

  • X. Liu

    (Institute of Engineering Innovation, The University of Tokyo)

  • T. Shimada

    (Institute of Engineering Innovation, The University of Tokyo)

  • S. Iwamoto

    (Institute of Industrial Science, The University of Tokyo)

  • Y. Arakawa

    (Institute of Industrial Science, The University of Tokyo)

  • Y. K. Kato

    (Institute of Engineering Innovation, The University of Tokyo)

Abstract

The unique emission properties of single-walled carbon nanotubes are attractive for achieving increased functionality in integrated photonics. In addition to being room-temperature telecom-band emitters that can be directly grown on silicon, they are ideal for coupling to nanoscale photonic structures. Here we report on high-efficiency coupling of individual air-suspended carbon nanotubes to silicon photonic crystal nanobeam cavities. Photoluminescence images of dielectric- and air-mode cavities reflect their distinctly different mode profiles and show that fields in the air are important for coupling. We find that the air-mode cavities couple more efficiently, and estimated spontaneous emission coupling factors reach a value as high as 0.85. Our results demonstrate advantages of ultralow mode-volumes in air-mode cavities for coupling to low-dimensional nanoscale emitters.

Suggested Citation

  • R. Miura & S. Imamura & R. Ohta & A. Ishii & X. Liu & T. Shimada & S. Iwamoto & Y. Arakawa & Y. K. Kato, 2014. "Ultralow mode-volume photonic crystal nanobeam cavities for high-efficiency coupling to individual carbon nanotube emitters," Nature Communications, Nature, vol. 5(1), pages 1-5, December.
    • Handle: RePEc:nat:natcom:v:5:y:2014:i:1:d:10.1038_ncomms6580
    DOI: 10.1038/ncomms6580
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