Nanophotonic devices have gained attention as promising solutions for all-optical image processing. These filters are of subwavelength size and carry potential to address limitations of current image processing technology including processing speed, energy requirements as well as size. We present results demonstrating the use of thin-film absorbers and metasurfaces to real-time detection of edges in images and the visualisation of phase objects including human cancer cells. We discuss the extension of these approaches to implement tuneable devices using phase-change materials and graphene. These approaches have potential for integration into ultra-compact mobile medical diagnostic tools, as well as remote sensing systems.
Metasurfaces with angular sensitivity have been shown to provide a platform for developing an ultra-compact phase imaging system. Their performance, however, is often limited to a narrow range of spatial frequencies. Here, we apply inverse design to design and fabricate a metasurface an asymmetric optical transfer function across a numerical aperture (NA) of 0.6. The engineered response of this device enables phase imaging of microscopic transparent objects.
Meta-optical devices have emerged as promising candidates for all-optical image processing. These devices are of subwavelength size and have the potential to address limitations of current image processing methods including processing speed, energy requirements as well as form factor. We present experimental results demonstrating the use of thin-film absorbers and optical metasurfaces to real-time detection of edges in images and the visualisation of phase objects including human cancer cells. Furthermore, we discuss progress towards the use of meta-optics for ultra-compact wavefront recovery. The findings to be presented have potential for applications in biological live-cell imaging, ultra-compact medical diagnostic tools, and wavefront correction methods.
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