CMOS-compatible all-dielectric metalens for improving pixel photodetector arrays
The ability to design light concentrators directly integrated on a chip is an issue in many applications of optics. Published recently in APL Photonics, we have developed a CMOS compatible metasurface lens based on the index profiles derived from the Maxwell fish-eye distribution. Based on this rational physics-driven design, we fabricate and characterize the optical performance of the metalens, achieving tight submicron focusing in excellent agreement with numerical simulations.
An important point to note is that the design which is not based on resonant elements allows a large spectral bandwidth to be obtained. It is scalable, can be readily implemented and is robust to minor fabrication deficiencies.