Characterization of Index and Surface-Relief Gratings Formed in Methacrylate Photopolymers |
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Authors: | Takashi Kojima Yasuo Tomita |
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Institution: | (1) Department of Electronics Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan |
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Abstract: | We report on an experimental investigation of the dual (index and surface-relief) grating formation in methacrylate photopolymers in the green. It is found that the dynamics of the diffracted signal from high spatial frequency dual gratings recorded in a thin film sample is mainly determined by the evolution of the volume index grating and is strongly dependent on writing intensities. Low spatial frequency dual gratings recorded in a bulk sample are also investigated. Depth profile and magnitude of the index grating are estimated quantitatively from the diffraction efficiency as a function of polish depth from the bulk sample’s surface. It is confirmed that the surface-relief grating is dominant in the light diffraction from the bulk sample. |
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Keywords: | photopolymers holographic recording materials volume hologram surface-relief grating micro-optical elements |
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