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. 2020 May 11;11:2336. doi: 10.1038/s41467-020-15914-5

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© The Author(s) 2020

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Fig. 1 — a Scanning electron microscope image of a deformed microresonator. As a comparison, a circular contour is shown in dashed orange line. b Conceptual illustration of chaos-assisted momentum transformation and dynamical tunneling from whispering-gallery-modes (WGMs) to chaotic states. c Schematic of the nonlinear frequency conversion from infrared (IR) to visible wavelengths in the deformed cavity with four-wave mixing (FWM) and sum-frequency generation (SFG, including harmonic generations as a special case).