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

Abstract

We report on high efficency 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.

4 pages, 4 figures

References in corpus (5)

• Electrically driven thermal light emission from individual single-walled carbon nanotubes
• Exciton diffusion in air-suspended single-walled carbon nanotubes
• Enhancement of carbon nanotube photoluminescence by photonic crystal nanocavities
• Optical microcavity with semiconducting single-wall carbon nanotubes
• Optical control of individual carbon nanotube light emitters by spectral double resonance in silicon microdisk resonators

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