ABSTRACT
Lens with no curvature? – an ultra-light lens that can change the whole imaging systems leaves many designing opportunities for researchers. The old concept of diffraction relying on very known phenomenon rainbow is formulated in such a manner that ultra-thin glass or even a plastic material (ten times less than human hair) is capable of capturing image pattern and video activities. Multi-level flat lenses are kept in a sequence that helps to bend all the seven rays (diffraction) in a single focal point so that an image can be formed and accuracy are also verified by the computational methodologies as well. Such lenses are called ‘Multi-Level Diffractive Lenses (MDL)’.MDLs are often called an achromatic lens, because of their special capability of nullifying chromatic aberration, a distortion caused when glass splits white light into multiple colour wavelengths in the spectrum. In Comparison to non-corrected singlet lenses, flat lenses (super achromatic lens) can produce much clearer images, which gives a more accurate perception and improved quality pictures. Unlike single curved lenses, the on-axis performance of an achromatic lens provides the most efficient use of aperture size regardless of degradation in image quality with the increment of aperture size. These ultra-thin, super achromatic, flat lenses would play a significant role in healthcare, entertainment and physical security purposes as new-age imaging is not only generating a clearer, brighter image quality but also cost-effective.
