Design parameters of free-form color routers for subwavelength pixelated CMOS image sensors

TL;DR

This paper investigates how design parameters like dimensions, refractive indices, and grid resolution influence the efficiency of metasurface-based color routers for CMOS image sensors, enabling fabrication with legacy facilities.

Contribution

It provides a detailed analysis of design parameters affecting optical efficiency and demonstrates feasible fabrication methods using existing manufacturing infrastructure.

Findings

Design parameters significantly impact optical efficiency.

Low-resolution fabrication is feasible with existing facilities.

Design guidelines for efficient metasurface color routers.

Abstract

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.