Abstract

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 9.35μm. Four different sphere sizes were used, with diameters of d=0.49, 0.73, 0.99, and 1.57μm. The photonic crystals were studied by normal incidence infrared reflectance measurements in the wavelength interval 0.812μm. Four peaks with the a magnitude of 0.6, originating from the periodicity of the crystal, were recorded in the interval between 1 and 4 μm. Another peak, the polaritonic reflectance peak (0.4), is observed for wavelengths around 9μm for all four crystals.

© 2006 Optical Society of America

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