Xiyuan recently published his newest results on frequency engineering of microring resonators through inner sidewall modulation of the resonator.
This approach enables selectively frequency splitting of several resonances that can be arbitrary selected. Such research opens the door to further engineering of frequency/phase matching for ultra-efficient non-linear processes such as four-wave mixing. Have a look at his paper in the latest issue of Photonics Research!
Lu, X., A. Rao, G. Moille, D. A. Westly, and K. Srinivasan, "Universal frequency engineering tool for microcavity nonlinear optics: multiple selective mode splitting of whispering-gallery resonances", Photon. Res., vol. 8, pp. 1676–1686, Nov, 2020
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