Abstract
Reflection and transmission for an artificial opal are described through a model of stratified medium based upon a 1D variation of an effective index. The model is notably applicable to a Langmuir–Blodgett-type disordered opal. Light scattering is accounted for by a phenomenological absorption. The interface region between the opal and the substrate, or the vacuum, induces a periodicity break in the photonic crystal arrangement, which exhibits prominent influence on the reflection, notably away from the Bragg reflection peak. Experimental results are compared with our model. The model is extendable to inverse opals, stacked cylinders, or irradiation by evanescent waves.
© 2015 Optical Society of America
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