Artificial Periodic Structures
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There is a large number of different artificial structures that either serve technological requirements (e.g., various solid state devices) or facilitate the physical understanding of certain phenomena by controlling the relevant parameters (or both). These structures may be periodic in one–dimension, two–dimensions, or fully, in three–dimensions. In some cases (e.g., in the so–called photonic and phononic crystals), periodicity is of critical importance, because the existence of the desired features depends on the existence of periodicity. In other cases (e.g., in the Left–handed Metamaterials to be discussed in this chapter), the unit cell already incorporates the core of the desired features and the periodic repetition simply enhances them.
KeywordsPhotonic Crystal Elastic Wave Periodic Structure Evanescent Wave Phononic Crystal
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