The modification of images to enhance and manipulate images is ubiquitous in contemporary image processing. Digital methods, however, require energy and challenges arise with the increasing amount of data being processed. Furthermore, cameras cannot directly sense phase variations in an optical field and, although computational methods have been developed to extract phase information from intensity, these are also relatively slow and data intensive. All-optical approaches to real-time image processing, on the other hand, are well-established but require the use of comparatively bulky optical components incompatible with the current push to device miniaturization. Here, the use of ultra-compact nanoscale resonant waveguide gratings and meta-optics for manipulating amplitude and phase objects will be presented.
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