| http://www.w3.org/ns/prov#value | - l body in which a plurality of column-like refractive-index hanging regions are formed in a two-dimensional manner, and FIG. 9B is a plan view of FIG. 9A; [0050]FIG. 10 is a plan view of an optical structural body in which a plurality of refractive-index changing regions are formed in the shape of a triangle lattice; and [0051]FIG. 11A is a perspective view of an optical structural body in which a
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