2026-10-11T23:27:03Z https://www.scidb.cn/oai

10.57760/sciencedb.40830 2026-06-29T15:27:06Z

2026-06-29 High-NA, Confocal, Achromatic Bifocal Metalens for Dual-Wavelength Parallel Focusing doi:10.57760/sciencedb.40830 en Achieving high numerical aperture (NA), achromaticity, and parallel multi-focal capability on a single planar element remains a critical challenge for next-generation petabit (Pb)-scale optical data storage, which is fundamentally limited by storage density and read/write speed. To address this, we propose and numerically demonstrate a novel dual-wavelength achromatic bifocal metalens. Our design leverages a hybrid strategy, combining a spatial interleaving scheme with the complete decoupling of propagation and geometric phases. This creates a platform capable of independently processing multiple wavelength and polarization channels. Simulation results confirm that the metalens focuses 450 and 532 nm light to two near-diffraction-limited spots on a single plane, maintaining a high effective NA of 0.81 and near-perfect energy symmetry (<0.01% imbalance). This work validates a scalable design philosophy and paves a new way toward ultra-compact optical read/write heads for multidimensional, parallel, and high-density optical storage. Metalens; Achromatic Metalens; Bifocal Metalens; Polarization Multiplexing; Optical Data Storage Liu Ying zhang Zhao Miao Ruan Hao RESTRICTED dataset http://www.doi.org/10.1016/j.optcom.2026.133341 Science Data Bank