Patent ID: 9632027
Date: 2017-04-25
CPC Classifications: G01N

Claim:
1. SPR sensor cell, comprising: an under-cladding layer; a core layer formed so that at least a part of the core layer is adjacent to the under-cladding layer; and a metal layer covering the core layer, wherein the core layer includes a uniform refractive index layer and a graded refractive index layer, wherein the graded refractive index layer is arranged between the uniform refractive index layer and the metal layer, and wherein a refractive index of the graded refractive index layer is equal to or greater than a refractive index of the uniform refractive index layer, and the refractive index of the graded refractive index layer increases continuously from a surface thereof on a uniform refractive index layer side to a metal layer side in a thickness direction of the graded refractive index layer.