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Recent advances in the design and fabrication of on-chip opticalmicroresonators has greatly expanded their applications in photonics, enablingmetrology, communications, and on-chip lasers. Designs for these applicationsrequire fine control of dispersion, bandwidth and high optical quality factors.Co-engineering these figures of merit remains a significant technologicalchallenge due to design strategies being largely limited to analytical tuningof cross-sectional geometry. Here, we show that photonic inverse-designfacilitates and expands the functionality of on-chip microresonators;theoretically and experimentally demonstrating flexible dispersion engineering,quality factor beyond 2 million on the silicon-on-insulator platform withsingle mode operation, and selective wavelength-band operation.

Augmenting On-Chip Microresonator through Photonic Inverse Design