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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 21, Iss. 4 — Apr. 1, 2004
  • pp: 517–522

Enhanced Fresnel zone plate coded microscopy of large-size objects

Gajendra Singh Solanki  »View Author Affiliations


JOSA A, Vol. 21, Issue 4, pp. 517-522 (2004)
http://dx.doi.org/10.1364/JOSAA.21.000517


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Abstract

A scheme for microscopy of relatively large-size objects by using Fresnel zone plate (FZP) coded imaging (FZPCI) is digitally demonstrated. The limit on the source size in zone-plate-based microscopy comes from interference of out-of-focus multidiffraction orders of the FZP with the focused-order image. From the study of the angular spectrum of the coded image, it is shown that noise contribution from higher orders to a lower-order image can be digitally suppressed by selective propagation of spatial frequencies. Similarly, noise from aliasing and noise from lower orders to a higher-order image can be reduced by spatially limiting the coded image. To my knowledge for the first time, the results of digitally performed FZPCI-based microscopy of an object that is three times larger than the first zone of the FZP with a resolution better than 2 μm are presented and discussed.

© 2004 Optical Society of America

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(090.1760) Holography : Computer holography
(100.2000) Image processing : Digital image processing
(100.2980) Image processing : Image enhancement
(100.3010) Image processing : Image reconstruction techniques
(110.4280) Imaging systems : Noise in imaging systems

Citation
Gajendra Singh Solanki, "Enhanced Fresnel zone plate coded microscopy of large-size objects," J. Opt. Soc. Am. A 21, 517-522 (2004)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-21-4-517

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