Abstract
A new type of diffractive optical bar code produced by
computer-generated holographic technology is proposed. The message
in the proposed bar code is hidden in the diffracted light of the bar
code element and can be read from the first diffraction order. In
contrast to the conventional hidden bar code, which needs a lens to
focus the diffracted light, the proposed hidden bar code has a property
of self-focusing. This self-focusing ability is achieved by
modulating a function of the Fresnel zone plate into the bar code
format. Consequently, the read-out process for the information in
this hidden bar code avoids the use of a lens. Experiments have
shown the feasibility of the proposed bar code and confirmed that it
can perform better than the conventional hidden bar code.
© 2002 Optical Society of America
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