Ultrahigh Sensitivity Mach−Zehnder Interferometer Sensor Based on a Weak One-Dimensional Field Confinement Silica Waveguide

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 a...

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Bibliographic Details
Published in:Sensors
Main Authors: Chenming Zhao, Lei Xu, Liying Liu
Format: Article
Language:English
Published: MDPI AG 2021-10-01
Subjects:
Mach−Zehnder interferometer sensor
weak confinement waveguide
waveguide sensitivity
Online Access:https://www.mdpi.com/1424-8220/21/19/6600
Description
Summary: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 (<i>LOD</i>) of 6.1 × 10<sup>−7</sup> RIU.
ISSN:1424-8220

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