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Narrow-band color filters have been integrated on porous silicon layers. Distributed Bragg reflectors and Fabry–Pérot interference filters based on layered porous silicon samples are demonstrated. The effects of narrowing and tuning the porous silicon emission band are shown in structures composed by Fabry–Pérot filters integrated on top of thick porous silicon layers.
Mazzoleni et al. (Mon,) studied this question.