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Simulated image on planar and curved imager arrays: (a) object, (b) luminance error for the image projected on a planar imager with a singlet lens (system I), (c) luminance error for a planar imager with triplet lens (system II), and (d) luminance error for a curved imager with ball-type lens (system III). (e) On-axis modulation transfer functions. (f) Off-axis modulation transfer functions. (g) Schematic of systems I, II, and III.
(a) Conforming a planar disk to a hemispherical surface by isotropic expansion of the center of the disk. (b) Conforming a planar disk to a hemispherical surface by tangential compression of the perimeter of the disk.
(a) Scanning electron micrograph of the microstructured silicon die. (b) Processing steps. (c) A curvable silicon membrane suspended from a tweezer.
(a) Schematic of the curving setup. [(b) and (c)] Images of a , array curved into a hemispherical shape with diameter. [(d) and (e)]. Detailed views of the silicon membrane showing the local deformation of the silicon springs between the islands.
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