Magneto photonic encoder
OwnerSutherland Cook Ellwood, JR.inventor
Life of this patent
Estimating the term…
Abstract
A magneto photonic encoder, in plane, includes a set of periodic structures of magneto photonic crystals for rotating a polarization of a beam of light responsive to a controllable magnetic field as it is transmitted through the periodic structures. The rotated polarization, in cooperation with a non-reciprocal-mode conversion device produces an encoded signal without use of crossed polarizers. Path optics guide the light beam into the periodic structures for polarization rotation and then to direct the modified beam of light into the non-reciprocal-mode conversion device. Depending upon the implementation, the encoded output may serve as display image primitive precursor to produce an image constituent signal.
Claims25
A magneto photonic encoder, comprising:
- a multilayer photonic crystal (MPC) including an input portion, an encoding portion, an output portion, an input interface between said input portion and said encoding portion, and an output interface between said encoding region and said output portion wherein said encoding portion includes a set of periodic MPC structures having an overlying reflective layer;
- a substrate supporting said multilayer photonic crystal;
- a first path-optic, disposed on said input portion, configured to direct an input beam of photons into said input interface at an angle for total internal reflection producing a propagating beam of photons through said set of periodic MPC structures with said propagating beam of photons having a polarization attribute;
- a first mechanism, physically associated with said encoding portion, configured to produce a first controllable magnetic field within said set of periodic MPC structures to controllably rotate said polarization attribute producing a polarization-modified propagating beam of photons at said output interface;
- and
- a controller coupled to said first mechanism to control a particular one magnetic field for said controllable magnetic field producing said polarization-modified propagating beam of photons with a particular polarization.
The magneto-photonic encoder of claim 3 further comprising:
- a second path-optic, disposed on said output portion, configured to receive said polarization-modified propagating beam of photons from said output interface and direct said polarization-modified propagating beam of photons into a non-reciprocal-mode conversion device producing an encoded beam of photons.
A method for encoding a photonic beam, comprising:
- receiving the photonic beam into a magneto photonic encoder, including a multilayer photonic crystal (MPC) including an input portion, an encoding portion, an output portion, an input interface between said input portion and said encoding portion, and an output interface between said encoding region and said output portion wherein said encoding portion includes a set of periodic MPC structures having an overlying reflective layer;
- a substrate supporting said multilayer photonic crystal;
- a first path-optic, disposed on said input portion, configured to direct an input beam of photons into said input interface at an angle for total internal reflection producing a propagating beam of photons through said set of periodic MPC structures with said propagating beam of photons having a polarization attribute;
- a first mechanism, physically associated with said encoding portion, configured to produce a first controllable magnetic field within said set of periodic MPC structures to controllably rotate said polarization attribute producing a polarization-modified propagating beam of photons at said output interface;
- and a controller coupled to said first mechanism to control a particular one magnetic field for said controllable magnetic field producing said polarization-modified propagating beam of photons with a particular polarization;
- setting a polarization rotation for the propagating beam of light in said encoding portion producing said polarization-modified propagating beam of photons;
- interacting said polarization-modified propagating beam of photons with a non-reciprocal-mode conversion device to set a transmissive amplitude for the photonic
Dependencies are inferred from the claim text.