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courses:lecture:pplec:pplecperiodicdim 2011/08/23 09:52 courses:lecture:pplec:pplecperiodicdim 2011/08/26 10:17 current
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    * // 3-D periodic system example: // The naturally occuring photonic crystal Opal.     * // 3-D periodic system example: // The naturally occuring photonic crystal Opal.
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Below we can also see a cartoon interpretation of the unit cells in Opal.  A 2-D periodic system can be acquired by taking only a single cross-section of unit cells in the pyramid. Below we can also see a cartoon interpretation of the unit cells in Opal.  A 2-D periodic system can be acquired by taking only a single cross-section of unit cells in the pyramid.
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-\textit{Image Sources: The Wikipedia article about opal crystals.}+\textbf{Image Sources: The Wikipedia article about opal crystals.}
    * // 1-D periodic system example: // a string of atoms in single-molecule conduction.     * // 1-D periodic system example: // a string of atoms in single-molecule conduction.
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  * In real physical cases, the systems always physically exist 3-Dimensionally; however, the dimensionality of the periodicity is all that concerns us now.   * In real physical cases, the systems always physically exist 3-Dimensionally; however, the dimensionality of the periodicity is all that concerns us now.

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