Patent ID: 6850365

Claim:
An optical multilayer structure, comprising: a configuration including a first layer being light-absorptive, a gap portion with a size between an odd multiple of λ/4 (λ is a wavelength of incident light) and an even multiple (including 0) of λ/4, the size being variable, and a second layer being transparent disposed in this order on a substrate, wherein a complex refractive index of the first layer is N 1 (=n 1 −ik 1 , n 1 is a refractive index, k 1 is an extinction coefficient, and i is an imaginary unit), a refractive index of the second layer is n 2 , and a refractive index of an incident medium is 1.0, a relationship of Mathematical Formula 3 is satisfied; ( n 1 −( n 2 2 +1)/2) 2 +k 1 2 −(( n 2 2 −1)/2) 2 =0. (Mathematical Formula 3)