Visible reflection spectra of opal photonic crystals infiltrated with magnetic materials have been measured in different areas on the (111) surface of the crystals with a spatial resolution of ∼0.1 mm. The observed reflection band corresponds to the photonic band gap of the opal. The peak position of the reflection band depends on the nature of the magnetic material infiltrated into the opal pores and the position of the fiber-optic probe on the opal surface.
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Горелик et al. (2010) studied this question.
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