| http://www.w3.org/ns/prov#value | - ing an optical size of the gap portion, wherein a complex refractive index of the first layer is N1 (=n1???ik1, n1 is a refractive index, k1 is an extinction coefficient, and i is an imaginary unit), a refractive index of the second layer is n2, and a refractive index of an incident medium is 1.0, a relationship of Mathematical Formula 7 is satisfied: (n 1???(n 2 2+1)/2)2 +k 1 2???((n 2 2???1)/2))
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