Dispersion engineered metasurfaces for broadband, high-NA, high-efficiency, dual-polarization analog image processing.

ABSTRACT: Optical metasurfaces performing analog image processing - such as spatial differentiation and edge detection - hold the potential to reduce processing times and power consumption, while avoiding bulky 4 F lens systems. However, current designs have been suffering from trade-offs between spatial resolution, throughput, polarization asymmetry, operational bandwidth, and isotropy. Here, we show that dispersion engineering provides an elegant way to design metasurfaces where all these critical metrics are simultaneously optimized. We experimentally demonstrate silicon metasurfaces performing isotropic and dual-polarization edge detection, with numerical apertures above 0.35 and spectral bandwidths of 35 nm around 1500 nm. Moreover, we introduce quantitative metrics to assess the efficiency of

SUBMITTER: Cotrufo M 

PROVIDER: S-EPMC10625611 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature