Structures for polarization and beam control
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United States of America Patent
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Issued Date -
Jun 15, 2006
app pub date -
Nov 3, 2005
filing date -
Dec 15, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In certain aspects, the invention features articles that include a layer including a plurality of rows of a first material extending along a first direction, the rows being spaced apart from each other and a center of each adjacent row being separated by a distance less than a wavelength .lamda. so that for radiation of wavelength .lamda. propagating along a path through the layer, the layer has a first effective index of refraction, n.sub.1, for the radiation having a first polarization state and the layer has second effective index of refraction, n.sub.2, for the radiation having a second polarization state orthogonal to the first polarization state, where n.sub.1 and n.sub.2 are different, where a surface of the layer includes a plurality of trenches, the trenches extending along a second direction and being spaced apart from each other, where a center of each adjacent trench is separated by a distance more than wavelength .lamda., and the trenches are filled with a second material having a refractive index, n.sub.3, different from n.sub.2.
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