Non-local scattering control in coupled resonator networks

We demonstrate scattering control of Gaussian-like wave packets propagating with constant envelope velocity and invariant waist through coupled resonator optical waveguides (CROW) via an external resonator coupled to multiple sites of the CROW. We calculate the analytical reflectance and transmittance using standard scattering methods from waveguide quantum electrodynamics and show it is possible to approximate them for an external resonator detuned to the CROW. Our analytical and approximate results are in good agreement with numerical simulations. We engineer various configurations using an external resonator coupled to two sites of a CROW to show light trapping with effective exponential decay between the coupling sites, wave packet splitting into two pairs of identical Gaussian-like wave packets, and a non-local Mach-Zehnder interferometer.(c) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

We demonstrate the scattering control of Gaussian-like wave packets with constant envelope velocity and invariant waist using coupled resonator optical waveguides (CROW) and an external resonator. The analytical and approximate results are in good agreement with numerical simulations. Various configurations, including light trapping, wave packet splitting, and non-local Mach-Zehnder interferometer, are engineered using an external resonator coupled to a CROW.