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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)

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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

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

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)

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