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Proceedings Paper

Simulation of a passive grating-heterodyne super-resolution concept
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Paper Abstract

We have developed a computer simulation to demonstrate the use of a periodic grating structure in the near field of a telescope to super-resolve objects in the far field. The separation between the telescope pupil and the grating provides a periodic anisoplanatism for the telescope, modulating the measured brightness of a point source as it moves across the field normal to the grating. The resulting periodic modulation of an extended source can thus produce a spatial frequency heterodyning effect, where frequency components outside the diffraction passband are aliased inside the passband and measured. Using the simulation, we have quantitatively validated the analytically-predicted periodic blur function for the case of single near-field grating. Further, we have shown the heterodyning effect is observed when the distance between the grating and pupil corresponds to the Talbot distance, where the grating forms a "self-image" in the plane of the pupil.

Paper Details

Date Published: 26 August 2008
PDF: 11 pages
Proc. SPIE 7094, Unconventional Imaging IV, 709403 (26 August 2008); doi: 10.1117/12.796115
Show Author Affiliations
David W. Tyler, Lockheed Martin Space Systems Co. (United States)
College of Optical Sciences, The Univ. of Arizona (United States)
Eamon B. Barrett, Lockheed Martin Space Systems Co. (United States)

Published in SPIE Proceedings Vol. 7094:
Unconventional Imaging IV
Jean J. Dolne; Thomas J. Karr; Victor L. Gamiz, Editor(s)

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