p using methods amenable to the mass production of devices.The beam of the hybrid system used in this work has dimensionsof 90 mm × 700 nm × 100 nm, and the microdisk has a diameter of76 mm, with a distance of 250 nm between the beam and themicrodisk. We coupled laser light into the cavity using thefibre–taper technique25 (Fig. 1c). In contrast to previous resultswith silica microdisks23, there are greater scattering losses as aresult of defects being formed on the microdisk during fabrication.This gives a considerably higher optical linewidth of dn ≈ 3 GHz(the optical quality factor is Q ¼ n0 / dn ≈ 65,000, where n0 is theresonance frequency of the mode).
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