Magnetic photonic crystal structure for providing spatial frequency asymmetry for light propagating in different directions
First Claim
1. A medium for providing asymmetry of spatial frequencies in the propagation of electromagnetic radiation such that F(k)=/=F(−
- k), where F is the frequency and k is the direction of propagation of the radiation, comprising;
at least two materials having different dielectric constants, said two materials being transmissive of said radiator and aligned along a direction of propagation in a two dimensional periodic array whose symmetry does not include a spatial inversion operator such that (x, y)=/=(−
x,−
y), wherein one or more of the materials forming said array is magnetic such that the magnetic group representation of the array does not include time inversion as a symmetry operator.
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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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Citations
13 Claims
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1. A medium for providing asymmetry of spatial frequencies in the propagation of electromagnetic radiation such that F(k)=/=F(−
- k), where F is the frequency and k is the direction of propagation of the radiation, comprising;
at least two materials having different dielectric constants, said two materials being transmissive of said radiator and aligned along a direction of propagation in a two dimensional periodic array whose symmetry does not include a spatial inversion operator such that (x, y)=/=(−
x,−
y),wherein one or more of the materials forming said array is magnetic such that the magnetic group representation of the array does not include time inversion as a symmetry operator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- k), where F is the frequency and k is the direction of propagation of the radiation, comprising;
Specification