Designing high-efficiency extended depth-of-focus metalens via topology-shape optimization.

ABSTRACT: Longitudinal optical field modulation is of critical importance in a wide range of applications, including optical imaging, spectroscopy, and optical manipulation. However, it remains a considerable challenge to realize a uniformly distributed light field with extended depth-of-focus. Here, a high-efficiency extended depth-of-focus metalens is proposed by adjoint-based topology-shape optimization approach, wherein the theoretical electric field intensity corresponding to a variable focal-length phase is utilized as the figure of merit. Using a dozen of metalens with random structure parameters as initial structures, the average focal depth of topology-shape optimized metalens is greatly improved up to 18.80 μm (about 29.7λ), which is 1.54 times higher than the diffraction-limited fo

SUBMITTER: Zheng Y 

PROVIDER: S-EPMC11501133 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature