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.