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Inverse design of compact multimode cavity couplers

Author(s): Jin, W; Molesky, S; Lin, Z; Fu, K-MC; Rodriguez, Alejandro W

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Abstract: 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.
Publication Date: 2018
Citation: Jin, W, Molesky, S, Lin, Z, Fu, K-MC, Rodriguez, AW. (2018). Inverse design of compact multimode cavity couplers. Optics Express, 26 (26713 - 26721. doi:10.1364/OE.26.026713
DOI: doi:10.1364/OE.26.026713
Pages: 26713 - 26721
Type of Material: Journal Article
Journal/Proceeding Title: Optics Express
Version: Author's manuscript

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