Patent ID: 7659987

Claim:
A sensing device for detecting an objective substance, comprising a first substrate; a light source; a light-receiving unit having a plurality of light-receiving elements; and a sensing element provided in an optical path from the light source to the light-receiving unit, the sensing element having a surface capable of fixing the objective substance thereon, wherein the sensing element comprises a second substrate and a plurality of metallic fine particles provided on the second substrate, the metallic fine particles give rise to a localized plasmon resonance by receiving a light emitted from the light source, and the resonance makes a change in spectral characteristics in response to a fixed state of the objective substance onto the metallic fine particles, and wherein a unit for varying the wavelength regions of light transmitted through the sensing element and entering light having a varied wavelength to the plurality of light-receiving elements is provided in the optical path, and the light source and the light-receiving unit are provided on the first substrate.