Phys.org October 24, 2022
After experimentally studying the optical properties of dielectric reflective metalenses including their off-axis focusing performance, researchers in Saudi Arabia proposed reflective metalens based on titanium dioxide (TiO2) and silicon dioxide (SiO2), which operate at a visible wavelength of 0.633 µm. Unlike conventional reflective metalenses based on metallic mirrors, the proposed device was designed based on a modified parabolic phase profile and was integrated onto a dielectric distributed Bragg reflector periodic structure to achieve high reflectivity with five dielectric pairs. The focusing efficiency characteristics of the metalens were experimentally studied for beam angles of incidence between 0∘ and 30∘. The results revealed that the focusing efficiency for the modified metalens design remains higher than 54% making it promising for photonic miniaturization and integration…read more. Open Access TECHNICAL ARTICLEÂ
Schematic diagram of dielectric flat reflector integrated metalens. Credit: Optics Express Vol. 30, Issue 19, pp. 34117-34128 (2022)Â