Akademik Veri Yönetim Sistemi
OPTICS COMMUNICATIONS, cilt.608, 2026 (SCI-Expanded, Scopus)
In this study, the performance of a metalens designed to operate over an ultra-broad spectral range covering the visible and near-infrared regions is numerically investigated. The optical and focusing performances of the metalens are evaluated at multiple wavelengths within the 600-2050 nm range, encompassing the visible (600-750 nm) and near-infrared (1550-2050 nm) bands. Unlike conventional approaches that rely on lightfocusing nanoblocks, an inverse design strategy is adopted in which focusing is achieved through hole-type nanostructures. The metalens is realized by coating a silicon (Si) substrate with titanium nitride (TiN) and selectively removing the TiN using predefined geometric parameters to form holes, following the inverse method of the nanoblock-based. Finite-difference time-domain simulations are performed, and the metalens is designed based on the Pancharatnam-Berry phase principle. The proposed single-design metalens demonstrates highperformance operation over a wide spectral range, achieves high numerical aperture values, and exhibits near-diffraction-limited focusing behavior. Owing to its high numerical aperture and near-diffraction-limited performance, the presented metalens shows strong potential for applications in visible and near-infrared nanophotonic systems and for the miniaturization of photonic devices.