Inverse design of compact multimode cavity couplers

Weiliang Jin, Sean Molesky, Zin Lin, Kai Mei C. Fu, Alejandro W. Rodriguez

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Efficient coupling between on-chip sources and cavities plays a key role in silicon photonics. However, despite the importance of this basic functionality, there are few systematic design tools to simultaneously control coupling between multiple modes in a compact resonator and a single waveguide. Here, we propose a large-scale adjoint optimization approach to produce wavelength-scale waveguide–cavity couplers operating over tunable and broad frequency bands. We numerically demonstrate couplers discovered by this method that can achieve critical, or nearly critical, coupling between multi-ring cavities and a single waveguide at up to six widely separated wavelengths spanning the 560–1500 nm range of interest for on-chip nonlinear optical devices.

Original languageEnglish (US)
Pages (from-to)26713-26721
Number of pages9
JournalOptics Express
Issue number20
StatePublished - Oct 1 2018

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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