System for selectively blocking electromagnetic energy
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United States of America Patent
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Jun 9, 2009
Grant Date -
Sep 22, 2005
app pub date -
Mar 18, 2004
filing date -
Mar 18, 2004
priority date (Note) -
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Abstract
A system for selectively blocking electromagnetic energy. The system includes a first mechanism for employing a perforated component to pass a beam characterized by a first property and reject a beam characterized by a second property. A second mechanism selectively alters a beam passed by the first mechanism so that upon reflection, the beam exhibits the second property. In a specific embodiment, the first property corresponds to a first polarization, and the second property corresponds to a second polarization. In the specific embodiment, the perforated component includes a beamsplitter having a first perforated metallic plate. The second mechanism includes a quarter-wave plate having a second perforated metallic plate.
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