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23 January 1997 Optically inscribed surface gratings in azo polymers used in resonant structures
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When surface gratings are inscribed on the surface of resonant cavities such as slab waveguides, sharp peaks can be observed in the transmission and reflection spectra of the structures. The peaks in the optical characteristics occur because the gratings act as couplers for light into the waveguides at specific wavelengths and angles of incidence. It has been found that stable surface gratings can readily be inscribed on polymers containing side groups such as poly{4'-[(2- (acryloyloxy)ethyl)ethylamino]-4-nitroazobenzene}. The gratings are made by direct exposure to an interference pattern and no further processing is required. The grating properties such as orientation, grating spacing and depth are easily controlled, and multiple gratings can be inscribed on one spot. Using various combinations of waveguides and surface gratings, structures which act as line filters and resonant reflectors are made and studied.
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Paul L. Rochon and Almeria Natansohn "Optically inscribed surface gratings in azo polymers used in resonant structures", Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997);

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