In this work, we describe a technique for positioning the passband and monitoring the slowing factor of Moiré
gratings written into PMMA-DR1 waveguides during fabrication. Slow light structures made with material
platforms such as silicon must fabricated before their actual slowing properties can be measured. In our dye
doped polymer waveguides, the slowing can be decided beforehand and the fabrication controlled to achieve the
desired performance figure. The resulting group velocity slowing in the composite waveguide can be controlled
by varying the index contrast of the grating. In dye-doped polymer materials we use, the index contrast can be
changed using the process of irreversible photobleaching. Our technique uses a broadband source to monitor the
reflectance spectrum of the grating and the delay of the structure is determined from this measurement.
The theory behind the technique is reviewed and results are presented for a Moiré grating written into
waveguides fabricated in the dye-doped polymer material system, PMMA-DR1.
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