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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 26 — Dec. 24, 2007
  • pp: 18066–18075

Microconcentrators to recover fill-factor in image photodetectors with pixel on-board processing circuits

Silvano Donati, Giuseppe Martini, and Michele Norgia  »View Author Affiliations


Optics Express, Vol. 15, Issue 26, pp. 18066-18075 (2007)
http://dx.doi.org/10.1364/OE.15.018066


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Abstract

We propose an array of non-imaging micro-concentrators as a mean to recover the loss of sensitivity due to area fill-factor. This is particularly important for those image photo detectors in which complex circuit functions are required and a substantial fraction of the pixel area is consumed, like e.g., 3D camera, SPAD arrays, fluorescence analyzers, etc., but also in CMOS sensors. So far, the low fill-factor was an unacceptable loss of sensitivity precluding from the development of such devices, whereas by using a concentrator array a recovery is possible, up to the inverse square of numerical aperture of the objective lens. By ray tracing, we calculate the concentration factors of several geometries of non-imaging concentrator, i.e., truncated cone, parabolic and compound parabolic, both reflective and refractive. The feasibility of a sizeable recovery of fill-factor (up to 50) is demonstrated.

© 2007 Optical Society of America

OCIS Codes
(220.1770) Optical design and fabrication : Concentrators
(230.5160) Optical devices : Photodetectors

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: August 28, 2007
Revised Manuscript: October 22, 2007
Manuscript Accepted: November 7, 2007
Published: December 18, 2007

Citation
Silvano Donati, Giuseppe Martini, and Michele Norgia, "Microconcentrators to recover fill-factor in image photodetectors with pixel on-board processing circuits," Opt. Express 15, 18066-18075 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-26-18066


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References

  1. S. Donati, Photodetectors, (Prentice Hall, Upper Saddle River, NJ, 1999), Appendix A2.
  2. W. T. Welford and R. Winston, The Optics of Nonimaging Concentrators, (Academic Press, New York, 1978).
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