公开(公告)号：US20230134264A1

公开(公告)日：2023-05-04

申请号：US17912327

申请日：2021-03-18

Applicant: NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY (NTNU)

Inventor： Mukesh YADAV ,  Astrid AKSNES ,  Dag Roar HJELME ,  Jens HØVIK

IPC: G01N21/77 ,  G01N21/39 ,  G01N21/45 ,  B01L3/00

Abstract: An optical sensing apparatus is provided comprising: an input interface for receiving input light into the optical sensing apparatus; an input waveguide and a reference waveguide, both arranged to receive input light from the input interface; a closed loop resonator, wherein the input waveguide is optically coupled to the closed loop resonator at an input point for introducing input light to the closed loop resonator; a sample region, adjacent the closed loop resonator, for receiving a sample such that evanescent coupling can occur between light in the closed loop resonator and the sample; a drop-port waveguide, optically coupled to the closed loop resonator at a drop point for receiving dropped light from the closed loop resonator; an output waveguide; and an output interface. The reference waveguide and the drop-port waveguide are arranged to direct interfering light through the output waveguide to produce an output signal at the output interface.