Asymmetric photonic crystal waveguide element having symmetric mode fields
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United States of America Patent
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May 30, 2006
Grant Date -
Mar 2, 2006
app pub date -
Aug 30, 2004
filing date -
Aug 30, 2004
priority date (Note) -
Expired
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Abstract
A slab photonic crystal waveguide that preserves the parity of guided modes. The waveguide includes a photonic crystal layer interposed between two dielectric layers. The photonic crystal layer includes a periodic arrangement of asymmetrically shaped dielectric regions within a surrounding dielectric material. The waveguide precludes conversion of the state of parity of an introduced input mode by maintaining a symmetric mode field distribution. A symmetric mode field distribution is attained through variations in the dielectric constants of the dielectric layers that compensate for asymmetric mode localization tendencies associated with the asymmetric periodically arranged dielectric regions within the photonic crystal layer.
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