Patent ID: 6940631

Claim:
An optical multilayer structure comprising: a substrate; a light-absorbing first layer; a gap portion having a changeable size capable of causing an optical interference phenomenon; and a second layer; wherein when a complex index of refraction of the substrate is N s (=n s −i·k s , where n s denotes a refractive index, k s denotes an extinction coefficient, and i represents an imaginary unit), a complex index of refraction of the first layer is N 1 (=n 1 −i·k 1 , where n 1 denotes a refractive index, and k 1 denotes an extinction coefficient), a refractive index of the second layer is n 2 , and a refractive index of an incident medium is 1.0, the relation of the following Expression (1) is satisfied {( n 1 −( n 2 2 +1)/2) 2 +k 1 2 −(( n 2 2 −1)/2) 2 }{( n s −( n 2 2 +1)/2) 2 +k s 2 −(( n 2 2 −1)/2) 2 }<0 (1).