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SUMMARY:ESE Seminar: "Metasurface Computational Imaging"
DESCRIPTION:Modern image sensors consist of systems of cascaded and bulky spherical optics for imaging with minimal aberrations. While these systems provide high-quality images\, the improved functionality comes at the cost of increased size and weight. One route to reduce a system’s complexity is via computational imaging\, in which much of the aberration correction and functionality of the optical hardware is shifted to post-processing in the software realm. Alternatively\, a designer could miniaturize the optics by replacing them with diffractive optical elements\, which mimic the functionality of refractive systems in a more compact form factor. Metasurfaces are an extreme example of such diffractive elements\, in which quasiperiodic arrays of resonant subwavelength optical antennas impart spatially-varying changes on a wavefront. While separately both computational imaging and metasurfaces are promising avenues toward simplifying optical systems\, a synergistic combination of these fields can further enhance system performance and facilitate advanced capabilities. In this talk\, I will present a method to combine these two techniques to perform full-color imaging across the whole visible spectrum [1]. I will also discuss the use of computational techniques to design new metasurfaces [2]\, and using metasurfaces to perform computation on wavefronts\, with applications in optical information processing and sensing. \n \nFigure: (a) Hybrid cubic-quadratic metasurface; (b) Using the metasurface and computational imaging we demonstrated full-color imaging; (c) We developed inverse design methodologies for metasurfaces made of dielectric spheres. \nReferences: [1] S. Colburn\, A. Zhan\, and A. Majumdar\, “Metasurface optics for full-color computational imaging\,” Science Advances\, vol. 4\, 2018. [2] A. Zhan\, T. K. Fryett\, S. Colburn\, and A. Majumdar\, “Inverse design of optical elements based on arrays of dielectric spheres\,” Applied Optics\, vol. 57\, pp. 1437-1446\, 2018/02/20 2018.
URL:https://seasevents.nmsdev7.com/event/ese-seminar-arka-majumdar/
LOCATION:PICS Conference Room 534 – A Wing \, 5th Floor\, 3401 Walnut Street\, Philadelphia\, PA\, 19104\, United States
CATEGORIES:Seminar
ORGANIZER;CN="Electrical and Systems Engineering":MAILTO:eseevents@seas.upenn.edu
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