Abstract
The effective optical absorption of a thin absorbing dye layer can be strongly increased when the usual transmission geometry is replaced by a reflection geometry where the dye layer is fixed parallel to a smooth metal mirror by a transparent interlayer of appropriate thickness and the attenuated beam is observed in reflection. We show that this absorption enhancement can be used to increase the sensitivity in optochemical sensor applications where thin dye layers are very often required. As a practical example we demonstrate a sensitivity increase by a factor of 5.5 for a thin layer of the dye crystal-violet used as an acetone-vapor sensor.
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