Experimental observations of the simultaneous presence of a polaritonic and a photonic gap in a three-dimensional photonic crystal is reported, to the best of our knowledge, for the first time. The photonic crystal was made of monodispersed silica microspheres sedimented into a face-centered-cubic structure. Silica has a polaritonic gap for wavelengths between 8 and . Four different sphere sizes were used, with diameters of , 0.73, 0.99, and . The photonic crystals were studied by normal incidence infrared reflectance measurements in the wavelength interval . Four peaks with the a magnitude of , originating from the periodicity of the crystal, were recorded in the interval between 1 and 4 μm. Another peak, the polaritonic reflectance peak , is observed for wavelengths around for all four crystals.
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