In this talk, we’ll discuss our latest findings on cascaded spiral diffractive lenses (cSDL) based on liquid crystal (LC) technology. Our lenses are notable for their low voltage requirements (less than 10Vrms), direct addressing capabilities, and wide aperture (greater than 25mm OD). They also boast high fill factors (over 98%) and a broad tunable focal range (over 4 Diopters). Each of the two cascaded devices are standard LC cells, created using a single direct laser writing lithographical process on a conventional transparent ITO covered glass substrate.
We’ll also share our recent work with dual frequency materials and the application of these lenses in zoom systems and dynamic achromatic image capture, highlighting our progress in reducing the haze often present in diffractive liquid crystal lenses, and other high resolution devices.
We’ll showcase implementations with both 24 and 72 electrodes, which allow for quasi analogue tuning across the entire tuning range.
Keywords: Liquid Crystal, flat lens, adaptive optics, diffractive optics, optical vortex, orbital angular momentum
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