Wavelength-selective mode converter based on ridge resonance and coherent tunneling via adiabatic passage

Ridge resonance has recently been discovered as a manifestation of a bound state in the continuum (BIC) on the silicon-on-insulator (SOI) platform, with the resonance achieved by the near-BIC operation controllable by the ridge width as parametric tuning. In this paper, based on the ridge resonance behavior and the coherent tunneling by adiabatic passage (CTAP) protocol, we propose and simulate a device that performs wavelength-selective mode conversion to create a resonator-like wavelength response, which can be a potential building block for an add-drop multiplexer compatible with manufacturing in silicon photonics foundry.