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Diagram of the experimental apparatus. IR light is coupled into and out of the device, which is a planar silicon oxynitride waveguide overcoated with a photosensitive polymer LC cladding layer. In this case patterned illumination of the LC cladding from interfering green laser beams produces in-plane Bragg reflection when the waveguide is rotated around an axis normal to its face to match the Bragg condition.
The chemical structures of the copolymers used for the cladding and Bragg reflectivity vs waveguide orientation . Angle was converted into effective wavelength using the Bragg law to generate the lower scale.
Waveguide transmission vs time and angle for writing with spatially modulated CP light , erasing with uniform CP light , and dark conditions . Complete erasure, not shown here, was found using longer erase times for writing energies .
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