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We investigate high-Q, small mode volume photonic crystal nanobeam cavities using a curved, tapered optical microfiber loop. The strength of the coupling between the cavity and the microfiber loop is shown to depend on the contact position on the nanobeam, angle between the nanobeam and the microfiber, and polarization of the light in the fiber. The results are compared to a resonant scattering measurement., "Vacuum Rabi splitting with a single quantum dot in a photonic crystal nanocavity," Nature 432,Controlling the spontaneous emission rate of a single quantum dot in a two dimensional photonic crystal," Phys. Rev. Lett. 95, 013904 (2005). 3. D. Press, S. Gotzinger, S. Reitzenstein, C. Hofman, A. Loffler, M. Kamp, A. Forchel, and Y. Yamamoto, "Photon antibunching from a single quantum-dot-microcavity system in the strong coupling regime," Phys.Modelling and fabrication of GaAs photonic-crystal cavities for cavity quantum electrodynamics", Nanotechnology 21, 065202 (2010). 6.

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