Akademik Veri Yönetim Sistemi
OPTICS AND LASERS IN ENGINEERING, cilt.201, 2026 (SCI-Expanded, Scopus)
A theoretical analysis of an ultra-broadband metalens is presented. The proposed metalens, composed of tungsten disulfide (WS2) nanofins positioned on a glass substrate, is capable of focusing light across an exceptionally wide spectral range from 450 to 1700 nm. WS2 is chosen for its high refractive index and good optical performance within this range. The metalens is designed using the finite-difference time-domain (FDTD) method based on the Pancharatnam-Berry (P-B) phase principle. Unlike previous studies, this work demonstrates a single metalens design capable of broadband focusing across the 450-1700 nm wavelength range. The results reveal high and stable numerical aperture values across the designed wavelengths, along with a remarkable polarization conversion efficiency of up to 99.2 % for the metalens unit cell. Despite operating over a very broad bandwidth, the metalens achieves diffraction-limited focusing for nearly all designed wavelengths. Furthermore, it exhibits a focusing efficiency reaching 62 % and maintains a high numerical aperture of approximately 0.91, indicating excellent optical performance within the targeted range. Additionally, the chromatic aberration (3.3 %) remains very low across the 450-1700 nm spectrum. The demonstrated diffraction-limited focusing, minimal chromatic aberration, high numerical aperture, and outstanding polarization conversion efficiency (PCE) highlight the potential of this design for advanced nanophotonic applications in the visible and near-infrared regions.