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Planar Fourier capture array

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This is an old revision of this page, as edited by Patrick Gill (talk | contribs) at 15:42, 5 March 2012. The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

The Planar Fourier Capture Array or PFCA is a tiny camera that requires no mirror, lens, focal length, or moving parts[1][2]. It is composed of angle-sensitive pixels, which can me manufactured in unmodified CMOS processes.

Light micrograph of the first prototype PFCA. The two square regions are complementary PFCAs, each of which 570 microns across, and the larger squares are bond pads.

Angle-sensitive pixels have a sensitivity to light that is sinusoidal in incident angle along the optically-sensitive axis[3]. Each sensor of the PFCA relates a distinct component of the 2D Fourier Transform.

Due to the fact that PFCAs do not require focusing optics or moving parts, they can be made smaller than the smallest focusing camera. Counting only the active portions of the PFCA (and not the structural substrate giving it physical robustness), PFCAs are a factor of 105 smaller than the smallest focusing camera[4].

Using complete information from one PFCA, it is possible to reconstruct the image presented up to the Nyquist limit set by the highest-frequency angle-sensitive pixel of the PFCA. In this example, an image of the Mona Lisa was presented to the PFCA with a capture time of 16.7 ms, and this image was computationally reconstructed.

References

  1. ^ P. R. Gill, C. Lee, D.-G. Lee, A. Wang, and A. Molnar, "A microscale camera using direct fourier-domain scene capture," Opt. Lett., vol. 36, no. 15, pp. 2949-2951, Aug. 2011.
  2. ^ P. R. Gill, C. Lee, S. Sivaramakrishnan, and A. Molnar, "Robustness of planar fourier capture arrays to color changes and lost pixels," Journal of Instrumentation, vol. 7, no. 01, 2012.
  3. ^ A. Wang, P. Gill, and A. Molnar, "Light field image sensors based on the talbot effect," Applied Optics, vol. 48, no. 31, pp. 5897-5905, 2009.
  4. ^ P. R. Gill, C. Lee, D.-G. Lee, A. Wang, and A. Molnar, "A microscale camera using direct fourier-domain scene capture," Opt. Lett., vol. 36, no. 15, pp. 2949-2951, Aug. 2011.
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