SURFACE PLASMON RESONANCE SENSOR CELL AND SURFACE PLASMON RESONANCE SENSOR

摘要

The present invention provides an SPR sensor cell having very excellent detection sensitivity and an SPR sensor. The SPR sensor cell of the present invention includes: 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. In the SPR sensor cell, the core layer includes a uniform refractive index layer and a graded refractive index layer. The graded refractive index layer is arranged between the uniform refractive index layer and the metal layer. A refractive index of the graded refractive index layer is equal to or more 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 the uniform refractive index layer side to the metal layer side in a thickness direction of the graded refractive index layer.