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
Full Article | PDF ArticleMore Like This
Qing Cao and Jürgen Jahns
J. Opt. Soc. Am. A 21(4) 561-571 (2004)
R. M. Henkelman and M. J. Bronskill
J. Opt. Soc. Am. 64(2) 134-137 (1974)
Ping Sun and Jing-hui Xie
Appl. Opt. 43(21) 4214-4218 (2004)