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Light propagation in a medium made of densely packed dielectric spheres isinvestigated by using a rigorous diffraction theory. It is shown that asubstantial suppression of the local density of states occurs in spectraldomains where the single constituents exhibit Mie resonances. The local densityof states decreases exponentially at the pertinent frequencies with a linearlyincreasing spatial extension of the aggregated spheres. It is shown that aself-sustaining random arrangement of core-shell spheres shows the samefundamental characteristics. Such approach offers a path towards easy tofabricate photonic materials with omnidirectional gaps that may find use invarious applications.

Suppression of light propagation in a medium made of randomly arranged dielectric spheres