THREE-DIMENSIONAL PERIODIC STRUCTURE, FUNCTIONAL ELEMENT HAVING THE SAME, AND LIGHT-EMITTING ELEMENT

PROBLEM TO BE SOLVED: To provide a three-dimensional periodic structure exhibiting a complete photonic band gap over a wide wavelength band and being readily manufactured, and to provide a functional element including the same.

SOLUTION: In the three-dimensional periodic structure exhibiting a photonic band gap, layers constituted of a plurality of square columns arrayed apart by a prescribed interval are successively laminated via additional layers, rectangular parallelepipeds included in the additional layers are arranged at positions, corresponding to the intersections of the square columns, and 1.21≤W1/W≤2.39 and W/W1<W2/W are satisfied.

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