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Schematic illustration of the lensfree on-chip holography platform.52,53,58,59 The objects are placed directly on a digital sensor array with typically Z2~ 1 mm distance to its active area. A partially-coherent light source, such as an LED, is placed Z1~ 40–100 mm away from the objects, and spatially filtered by a pinhole of diameter d~0.05–0.1 mm to record the digital in-line holograms of objects with unit fringe magnification over a large field-of-view (FOV), e.g., 24 mm2.
