  Metasurface-based color routers are emerging as next-generation optical
components for image sensors, replacing classical color filters and microlens
arrays. In this work, we report how the design parameters such as the device
dimensions and refractive indices of the dielectrics affect the optical
efficiency of the color routers. Also, we report how the design grid resolution
parameters affect the optical efficiency and discover that the fabrication of a
color router is possible even in legacy fabrication facilities with low
structure resolutions.
