Inverse Design of Compact Multimode Cavity Couplers

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.

5 pages, 3 figures

References in corpus (4)

• Coupling ideality of integrated planar high-Q microresonators
• Photonic skin-depth engineering
• Topology optimization of multi-track ring resonators and 2D microcavities for nonlinear frequency conversion
• Overcoming limits to near-field radiative heat transfer in uniform planar media through multilayer optimization

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• Polarization-Controlled Cavity Input-Output Relations
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• Interpretable inverse-designed cavity for on-chip nonlinear and quantum optics