POLARIZER ELEMENTS AND SYSTEMS USING THE SAME
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United States of America Patent
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Issued Date -
Dec 11, 2008
app pub date -
Apr 21, 2008
filing date -
Apr 23, 2007
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Abandoned
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Abstract
In general, in a first aspect, the invention features an article that includes a plurality of spaced apart ridges extending along a first direction, adjacent ridges being spaced with a period of .LAMBDA. or less, each ridge comprising a plurality of layers where adjacent layers have different refractive indexes at a first wavelength .lamda..sub.1 and a second wavelength .lamda..sub.2, where .lamda..sub.1 and .lamda..sub.2 are different, .LAMBDA.<.lamda..lamda..sub.1, and .LAMBDA.<.lamda..sub.2. The ridges are configured so that for radiation at .lamda..sub.1 and .lamda..sub.2 incident on the grating, the grating substantially blocks the radiation at .lamda..sub.1 having a first polarization state, substantially transmits the radiation at .lamda..sub.2 having the first polarization state, and substantially transmits the radiation at .lamda..sub.1 and .lamda..sub.2 having a second polarization state, where the first and second polarization states are orthogonal.
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