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We study, both theoretically and experimentally, the existence and behavior of surface localized modes in a one-dimensional (1D) comblike photonic band gap structure. The structure is composed of a waveguide, along which dangling side branches are grafted periodically. We demonstrate a theoretical rule about the existence of surface states in such 1D periodic structures; namely, when one considers...
It has been shown that a one-dimensional periodic structure such as a superlattice can exhibit the property of omnidirectional reflection, which means that any incident wave launched from the vacuum (or from a substrate) will undergo a total reflection at the superlattice boundary, whatever the incident angle or the polarization of light is. In this communication, we show that large omnidirectional...
The explicit formulae for the Green functions are given for the bulk crystal, for a crystal with surface and for finite-thickness thin layers adsorbed on a surface as a function of microscopic interaction parameters. The case of the (001)Fe surface and of epitaxial layers of W on the same surface is studied on the basis of the experimental dispersion curves. The vibrations of atoms at any distance...
Two Green function techniques (the direct matching formalism and the interface response theory) are used to investigate the electronic structure of a semi-infinite GaAs/Ga 1-x Al x As superlattice being in contact with a Ga 1-y Al y As substrate. The effect of the superlattice termination on the formation of a surface state as well as on the density-of-states...
The existence of localized and resonant optical waves associated with the surface of a semi-infinite superlattice or its interface with a substrate is reported considering the case of s-polarization (transverse electric modes). These modes appear as well defined peaks of the density of states, either inside the minigaps or inside the bulk bands of the superlattice. The density of states, function...
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