Uncoupled photonic band gaps |
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| Authors: | Dj. Jovanović B. Nikolić T. Radić D.M. Djokić R. Gajić |
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| Affiliation: | 1. Center for Solid State Physics and New Materials, Institute of Physics, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia;2. Faculty of Physics, University of Belgrade, P.O. Box 368, 11001 Belgrade, Serbia;3. E-Search, Bulevar Mihaila Pupina 10z/IV, 11000 Belgrade, Serbia;4. Institute of Condensed Matter Physics, EPFL, CH-1015 Lausanne, Switzerland |
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| Abstract: | We theoretically investigated the symmetry properties of the modes in two-dimensional square lattice photonic crystals in order to study phenomena that would enable new frontiers in the applications of photonic crystals. Using group theory, symmetry analysis of the photonic crystals bands has been done. Particular attention was given to the search for the uncoupled B modes that cannot be excited by the external plane wave because they are symmetry forbidden. The existence of the uncoupled modes enabled to define new physics phenomena: uncoupled photonic band gaps. For the frequency ranges inside the uncoupled photonic band gaps, zero transmission is obtained. Therefore, there are two different types of photonic gaps in the photonic crystals: photonic band gaps and uncoupled photonic band gaps. The appearance of uncoupled photonic band gaps in photonic crystals could at least improve the application of the existing photonic materials and structures or even enable the usage of new ones for devices like waveguides, filters, and lasers. |
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