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

R. Miura, S. Imamura, R. Ohta, A. Ishii, X. Liu, T. Shimada, S. Iwamoto, Y. Arakawa and Y. K. Kato ()
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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

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: 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.

Date: 2014
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DOI: 10.1038/ncomms6580

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