Patent ID: 9719936
Date: 2017-08-01
CPC Classifications: G01J,G01N,G02B

Claim:
1. An assembly, comprising: a waveguide; a monolithic substrate having a coupling side and a sensing side, wherein the coupling side is coupled to the waveguide; a coupling medium located between the waveguide and the monolithic substrate, wherein the refractive index of the monolithic substrate is higher than the refractive index of the waveguide, and the refractive index of the coupling medium is in between the refractive indexes of the monolithic substrate and the waveguide; and a thin-film layer attached to the sensing side of the monolithic substrate, wherein the thin film layer comprises a transparent material, a first reflecting surface, and a second reflecting surface between the thin film layer and the monolithic substrate, and wherein the thin film layer is configured to cause a spectral interference between light reflected into the waveguide from said first and said second reflecting surfaces.