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(a) Schematic illustration of a hexagonal tiling of hexagonal islands that support silicon photodetectors and blocking diodes, with interconnecting ribbons of metal (Au/Cr) encapsulated by polyimide (top), and detailed layout of an individual element, which combines a photodiode and a blocking diode (bottom). The outer, inner and middle shaded regions correspond to -and -doped and undoped silicon, respectively. (b) Schematic illustrations with top- and side-views of such an array conformally wrapped onto a paraboloid surface. The dotted white circle in the top frame indicates an approximately circular field of view, made possible by the hexagonal tiling. (c) Illustration for transferring a circular element (15 mm in diameter) on a parabolic surface (left), and a hemispherical surface (right).
Ray tracing results to map the image surface formed by a planoconvex lens. Rays originating from five points on an object plane (left) pass through the lens (center) and cross at points that define an image surface (right). The actual image surface is well described by a paraboloid of revolution (left solid line). The middle and right solid lines correspond to approximations based on hemispherical and planar surfaces, respectively.
(a) Photograph of a hexagonal photodetector/diode array on a planar surface (bottom) and optical microscope image of a single unit cell (top). (b) Photograph of such an array transferred onto a parabolic surface, where the inset provides a top view. (c) Photograph of completed imager mounted in a PCB, where the inset shows a top view of the device area. (d) Representative current-voltage response of a pixel in the camera of frame (c), with a light on (top) and off (bottom), where is ratio of current between on/off states.
(a) Image of a test pattern consisting of a hexagonal array of white dots (2 mm in diameter and 4 mm in pitch) captured with a planar camera (left) and a paraboloid camera (upper right) and a planar projection (lower right). The bottom frames present intensity profiles collected along the dotted lines in the images. (b) Examples of reconstructed color picture collected with the paraboloid camera. The top part of this frame corresponds to the image itself, while the bottom frame provides a planar projection. The inset at the right shows the object. (The axes units are millimeters.)
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