Ultrahigh Sensitivity Mach−Zehnder Interferometer Sensor Based on a Weak One-Dimensional Field Confinement Silica Waveguide
Chenming Zhao,
Lei Xu,
Liying Liu
Affiliations
Chenming Zhao
Key Lab for Micro and Nanophotonic Structures (Ministry of Education) of Ultra Precision Optical Manufacturing, Shanghai Engineering Research Center, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
Lei Xu
Key Lab for Micro and Nanophotonic Structures (Ministry of Education) of Ultra Precision Optical Manufacturing, Shanghai Engineering Research Center, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
Liying Liu
Key Lab for Micro and Nanophotonic Structures (Ministry of Education) of Ultra Precision Optical Manufacturing, Shanghai Engineering Research Center, Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China
We report a novel Mach−Zehnder interferometer (MZI) sensor that utilizes a weak one-dimensional field confinement silica waveguide (WCSW). The WCSW has a large horizontal and vertical aspect ratio and low refractive index difference, which features easy preparation and a large evanescent field for achieving high waveguide sensitivity. We experimentally achieved WCSW ultrahigh waveguide sensitivity of 0.94, MZI sensitivity of 44,364 π/RIU and a low limit of detection (LOD) of 6.1 × 10−7 RIU.
