Abstract
We investigate the optical properties of a metal/insulator superlattice with regular and random layer widths. The choice of materials, frequency and layer widths implies that a large range of optical transfer functions are available. An effective medium approach is introduced to make it easier to design a superlattice having the desired optical transfer function. We phrase our analysis in terms of the coupled photon-polarization modes of the superlattice; its elementary excitations. We find in particular the possibility of a Rydberg like series of localized photonic states. Our study also incorporates an analysis of a very thin superlattice, just one unit cell. We discuss how this system can be used for optical switching or filter action.
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