![]() ![]() ![]() The goal of the research was to develop a better metalens with a higher NA and to demonstrate that this could be achieved automatically via an optimization platform. Crystalline Silicon (c-Si) on sapphire was used as the target fabrication process rather than the typical TiO 2 to further increase NA while remaining compatible with a standard CMOS process. A novel hybrid optimization algorithm (HOA) was used to find optimal designs by iteratively simulating with FDTD to determine transmission rate and absorption and evaluating each candidate with a figure-of-merit focused on maximizing TE and TM transmission while minimizing the discrepancy between the simulated and target phase. The State Key Laboratory of Optoelectronic Materials & Technology at Sun Yat-sen University set out to develop a metalens with ultra-high numerical aperture (NA) when front-immersed in oil, enabling subwavelength imaging with higher resolution. Figure 1: The metalens developed at Sun Yat-Sen University (left) was developed by individually optimizing individual “nanobrick” elements (right) using Lumerical FDTD. ![]()
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