The normalized sample diffraction efficiency as function of the wavelength λ for a 100 μm thick sample.
Angular selectivity of the grating. θB is the Bragg angle for the used wavelength of 405 nm.
Transmission spectra of a Iron (III) doped sample taken before (empty circles) and after (filled circles) the grating formation. Reflections and losses due to the glass interfaces have been subtracted from the data.
Possible mechanisms for free radical photo-polymerization process on acrylate induced by Fe3+, under irradiation of a laser light. In the scheme are indicated two ways: (a) an electron transfer from a monomer molecule to Fe3+ with consequent formation of carbon centered free radicals; (b) via electron transfer from the water present in the complex to Fe3+; in this latter case it should be hypothesized the intermediate formation of hydroxyl radical ( · OH).
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