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As part of their research into optical states of plasmonic-photonic crystals (PPCs), scientists at Kazan Federal University investigated three-dimensional opal-like plasmonic-photonic crystals (OLPPCs), focusing on why OLPPCs do not admit light of certain wavelengths. (This is called the photonic bandgap — it is the range of light wavelengths where propagation through a crystal is difficult).
Schemes of PPCs with equal effective refractive index and structure period: 1D PPC (a), and 3D opal-like PPC (b). Courtesy of Kazan Federal University.
The primary conditions for passing a light beam with the wavelength of the photonic bandgap and a certain polarization through an OLPPC are the continuity of the gold layer, with a…