Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2005-06-17
2009-08-04
Sugarman, Scott J (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
C359S252000
Reexamination Certificate
active
07570414
ABSTRACT:
A magnetic photonic crystal for providing asymmetry of spatial frequencies in the propagation of light is provided. The crystal is formed from at least two materials having different indices of refraction which are aligned along the longitudinal axis of the crystal. And arranged in an array whose symmetry does not include a spatial inversion operator such that (x,y)==/=(−x,−y). One or more of the materials forming the array is magnetic such that the magnetic group representation of the array does not include time inversion as a symmetric operator. In operation, when the magnetic material forming the material is magnetized, the group velocity property of light propagated in one direction along the axis of the array is different from the group velocity property of light transmitted in an opposite direction through the array. The magnetic photonic crystal may be used, for example, as an optical memory device or a high speed modulator/demodulator.
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Allan Douglas Clippinger
Borrelli Nicholas Francis
Koch, III Karl William
Wight, Jr. John Forrest
Bean Gregory V.
Corning Incorporated
Paglierani Ronald J.
Sugarman Scott J
Thomas Brandi N
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