Device for modulating optical radiation by a variable magnetic field
First Claim
1. A device for modulating optical radiation by a variable magnetic field, said device comprising a wave guide formed by a thin magnetic layer and a substrate, said magnetic layer being deposited on said substrate with a constant thickness and being capable of propagating first and second modes of radiated energy;
- said device further comprising means for exciting energy of said first mode in said magnetic layer, means for inducing a variable magnetic field parallel to the direction of propagation of said energy to enable at least a fraction of said energy to be converted from said first mode to said second mode, mode absorbing means arranged on said magnetic layer for selectively transmitting the energy of one of said first and second modes and means arranged for extracting from said magnetic layer the energy supplied in one of said modes by said mode absorbing means.
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Abstract
The device according to the invention comprises a wave guide formed by a thin layer of a ferrimagnetic garnet deposited onto a substrate, preferably by epitaxy, and capable of propagating first and second modes of radiated energy, means for exciting the first mode in said layer, means for inducing a magnetic field in the propagation direction to enable at least a fraction of the propagated energy to be transferred from the first mode towards the second mode, means for selectively transmitting one of the two modes situated in front of the guide, for example a metallic layer deposited onto the thin layer and means for extracting the energy of the transmitted mode.
13 Citations
10 Claims
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1. A device for modulating optical radiation by a variable magnetic field, said device comprising a wave guide formed by a thin magnetic layer and a substrate, said magnetic layer being deposited on said substrate with a constant thickness and being capable of propagating first and second modes of radiated energy;
- said device further comprising means for exciting energy of said first mode in said magnetic layer, means for inducing a variable magnetic field parallel to the direction of propagation of said energy to enable at least a fraction of said energy to be converted from said first mode to said second mode, mode absorbing means arranged on said magnetic layer for selectively transmitting the energy of one of said first and second modes and means arranged for extracting from said magnetic layer the energy supplied in one of said modes by said mode absorbing means.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
Specification