| http://www.w3.org/ns/prov#value | - The photonic crystal like this is described in detail by Baba (O plus E, 1999, December, p.1524-1532 (Vol.21, No.12)). [0050] The photonic crystal is constituted of portions having different refractivities (dielectric constants) arranged periodically, having optical properties controlled thereby. [0051] An example is a two-dimensional photonic crystal as shown in FIG. 13A. This photonic crystal ha
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