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We report on high efficency coupling of individual air-suspended carbonnanotubes to silicon photonic crystal nanobeam cavities. Photoluminescenceimages of dielectric- and air-mode cavities reflect their distinctly differentmode profiles and show that fields in the air are important for coupling. Wefind that the air-mode cavities couple more efficiently, and estimatedspontaneous emission coupling factors reach a value as high as 0.85. Ourresults demonstrate advantages of ultralow mode-volumes in air-mode cavitiesfor coupling to low-dimensional nanoscale emitters.

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