|
Integrated photonic sensors on silicon nitride platforms are at the forefront of developments for decentralized, real-time detection of biological and chemical substances. Their increasingly precise sensitivity enables broad applications in the medical, pharmaceutical, and chemical sectors. However, attention to the adverse effect of optical loss is often inadequately addressed, limiting the available intensity in the transmission spectrum, thereby impinging on the achievable detection limits. In this computational study, we address the optimization of a microring-based resonator system, harnessing a recently formulated semi-analytical model of surface-roughness-induced scattering for waveguide-based loss optimization. Our focus extends beyond considering sensitivity to propose a comprehensive figure of merit for resonator design by including the quality factor influenced by the coupling coefficient. Simultaneously, we demonstrate how strategic adjustments of gap-coupling metrics can result in significant enhancements in resonator performance. The wavelength range of the target application is set to be around 850nm, focusing on transverse-electric polarization, as well as transverse-magnetic polarization of the input light. The dimensions of the waveguides have been established considering previous studies, with a width falling within 300 and 800nm. Furthermore, the nitride layer thickness will vary between 200 and 400nm, the ring radius between 20 and 60μm and the gap between 200 and 800nm. These parameters form the resonator’s design’s foundational geometry and layer properties. This work emphasizes the need for a holistic design process to fully leverage the potential of integrated photonic devices.
|
