Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2008-05-28
2009-12-08
Luu, Thanh X (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S227170, C359S486010
Reexamination Certificate
active
07629569
ABSTRACT:
An optical combination includes a substrate, a linear polarizer on the substrate, and a first frequency selective surface (FSS) based elliptical polarization filter on the linear polarizer. The first FSS comprises at least one periodic pattern of spaced apart electrically conductive lines having a sub-wavelength line-to-line spacing orientated along a first axis. The pattern is operable to impose a phase differential for one orthogonal linear polarization state relative to the other linear polarization state for electromagnetic radiation having a wavelength between 400 nm and 1 mm, such as 1 μm to 12 μm. An identification system and associated method for identifying objects includes at least one tag having encoded information attached to the surface of an object to be identified, wherein the tag includes a first FSS-based elliptical polarization filter which provides the encoding. A remotely located receiver including a second FSS-based elliptical polarization filter and a linear polarizer optically coupled to the second filter is operable for differentially attenuating the first and second orthogonal polarization states allowing a determination whether the intensity pattern corresponds to the encoded information.
REFERENCES:
patent: 2003/0214456 (2003-11-01), Lynch et al.
patent: 2005/0045799 (2005-03-01), Deng et al.
patent: 2006/0227422 (2006-10-01), Monacelli et al.
Boreman Glenn
Mullally Daniel E.
Tharp Jeff
Jetter Neil R.
Legasse Jr. Francis M
Luu Thanh X
Patents On Demand, P.A.
University of Central Florida Research Foundation Inc.
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