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1. (WO2017156534) OPTICAL SENSING WITH CRITICALLY COUPLED PLANAR WAVEGUIDE WITH OPTIONAL INTEGRATION OF LAYERED TWO-DIMENSIONAL MATERIALS

Pub. No.:    WO/2017/156534    International Application No.:    PCT/US2017/022151
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Mar 14 00:59:59 CET 2017
IPC: G01N 21/552
Applicants: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
Inventors: WANG, Feng
HORNG, Jason
BALCH, Halleh, B.
Title: OPTICAL SENSING WITH CRITICALLY COUPLED PLANAR WAVEGUIDE WITH OPTIONAL INTEGRATION OF LAYERED TWO-DIMENSIONAL MATERIALS
Abstract:
An optical sensing system includes a planar optical waveguide having a first surface for detection and a second surface for coupling light. The optical sensing system includes a functional layer integral with the first surface of the planar optical waveguide, and a coupling layer in contact with the second surface of the planar optical waveguide, the coupling layer having a lower refractive index than the planar optical waveguide. The optical sensing system includes an optical source arranged to illuminate at least a portion of the second surface of the planar optical waveguide through the coupling layer with substantially critical optical coupling. The optical sensing system also includes an optical detector arranged to receive a portion of light from the optical source after being reflected from the first surface of the planar optical waveguide and passing through the coupling layer.