A review of different integration platforms for high-Q Whispering Gallery Mode bulk resonators is presented, including SOI slotted photonics crystal waveguides, suspended Si photonic crystal membranes or suspended silica waveguides. While each of these approaches allows coupling to a specific monolithic resonator, including those made in low index materials, a novel architecture, based on metamaterial engineered silicon photonics waveguides, provides unique flexibility to couple a wide range of WGM microresonators, enabling the combination of high-performance resonators with complex Si photonic circuits.
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