Disclosed are novel reflective films having symmetrical reflection
characteristics on the upper and lower surfaces thereof. Preferably, such
films are made from cholesteric liquid crystal (CLC) material, wherein the
pitch of the helices of the liquid crystal molecules therein varies along
the thickness dimension (i.e. transverse to the surface) of the film.
Depending on the final spiral structure of the materials utilized, the CLC
circularly polarizing film materials reflect either left-handed or
right-handed circularly polarized light. In a first illustrative
embodiment, the CLC film has a laminated construction in order that both
the upper and lower surfaces thereof have substantially the same
reflection characteristics over its tuned reflection band. In second
illustrative embodiment, the CLC film has a laminated construction in
order that both the upper and lower surfaces thereof have substantially
the same reflection characteristics over its broadband reflection band. By
virtue of their circularly polarizing reflection characteristics, the CLC
films of the present invention can be used to form polarization-encoded
spatially multiplexed images (SMI) on radiation absorbing surfaces,
coloring media with high brightness characteristics, CLC-based toner 2-D
and 3-D xerographic printing processes, and the like.