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(a) Scanning electron micrograph and (b) an optical micrograph of a microtoroid photonic resonator (from ref 43). A tapered fiber used to excite resonance in the microtoroid can be seen in (b) as well. (c) An array of microring resonators from ref. 47. The inset shows an individual microring next to a linear waveguide, both which have been revealed within an annular opening inside a polymer cladding layer.
