2015/07/14 by Anat Demeter, Demeter, Anat, Shlomo Ruschin +1
Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Beam (structure) #Blazed grating #Computer science #Diffraction #Diffraction grating #FOS: Physical sciences #Grating #Interferometry #Materials science #Mechanical and Optical Resonators #Optics #Optics (physics.optics) #Phase (matter) #Photonic and Optical Devices #Physics #Planar #Refractive index #Ultrasonic grating #Waveguide #physics.optics
paper · pdf · doi:10.48550/arxiv.1507.03810
16 pages 4 figures
openalex publication_date 2015/07/14 · arxiv created 2015/08/04 · arxiv updated 2015/08/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a one-port sensor based on a single diffraction grating delineated over a planar optical waveguide. Distinctly to previously reported devices, the grating here is used not only as I/O coupler, but also provides a built-in reference beam which is basically unaffected by the sensing process as manifested in changes of the effective refractive index of the waveguide. The sensing process causes two effects simultaneously: a change in the angle of the out-coupled beam and a change in the phase accumulated by that beam. Both changes can be determined by their conjunction with the reference beam back-diffracted directly by the grating. These two effects are expected to have despair sensitivities, the angle changing effect being coarse and the interferometric phase-change effect being highly sensitive. Sensing simultaneously at two different scales will translate into a large sensing dynamic range.