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Applied Optics

Applied Optics


  • Vol. 43, Iss. 33 — Nov. 20, 2004
  • pp: 6067–6073

Infrared antennas coupled to lithographic Fresnel zone plate lenses

Francisco Javier González, Javier Alda, Bojan Ilic, and Glenn D. Boreman  »View Author Affiliations

Applied Optics, Vol. 43, Issue 33, pp. 6067-6073 (2004)

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Several designs for Fresnel zone plate lenses (FZPLs) to be used in conjunction with antenna-coupled infrared detectors have been fabricated and tested. The designs comprise square and circular FZPLs with different numbers of Fresnel zones working in transmissive or reflective modes designed to focus infrared energy on a square-spiral antenna connected to a microbolometer. A 163× maximum increase in response was obtained from a 15-zone circular FZPL in the transmissive mode. Sensor measurements of normalized detectivity D* resulted in a 2.67× increase with FZPLs compared with measurements made of square-spiral antennas without FZPLs. The experimental results are discussed and compared with values obtained from theoretical calculations.

© 2004 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(230.3990) Optical devices : Micro-optical devices

Original Manuscript: May 3, 2004
Revised Manuscript: August 17, 2004
Published: November 20, 2004

Francisco Javier González, Javier Alda, Bojan Ilic, and Glenn D. Boreman, "Infrared antennas coupled to lithographic Fresnel zone plate lenses," Appl. Opt. 43, 6067-6073 (2004)

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