Fig. 3: Electronic operation and aperture optics of the camera.
From: Anti-distortion bioinspired camera with an inhomogeneous photo-pixel array
a Photograph of the non-uniform 128 × 32 silicon photodiode array. Inset: photograph of the cylindrical image sensor. b Electronics setup to read out pixel photocurrents for real-time image acquisition. c Optical micrograph of a single pixel comprising a photodiode (PD) and a blocking diode (BD) that are back-to-back connected. d Measured current vs. bias voltage of a representative pixel, under light illumination with various intensities (light source: 532-nm laser diode). Its responsivity is 0.10 A W−1 for an intensity of 1.47 W m−2. The results for a wide range of intensities, spanning from 7.14 × 10−3 W m−2 to 1.52 × 105 W m−2, are shown in Supplementary Fig. 6e. e Photograph of the spherical lens and the elliptical aperture. f Point spreading functions (simulations) of our camera for varying horizontal viewing angles. g Simulated focal spot size as functions of object distance and horizonal viewing angle, for the anti-distortion bioinspired camera with the elliptical aperture (1.0 mm major axis and 0.5 mm minor axis) used in our work (left) and with a circular aperture with a diameter of 1.88 mm (right).
