On-Chip Chemical Sensing Using Double-slot Silicon Waveguide
Abstract
In this paper, we present refractive index measurement using a double-slot silicon waveguide-based Mach Zehnder interferometer. We present a double-slot waveguide that offers the best sensitivity and limit of detection compared to wire and single-slot waveguides. We demonstrate ultra-low loss coupling between a single-mode waveguide and a double-slot waveguide and experimental proof for double-slot excitation. The double-slot waveguide is used to demonstrate a highly sensitive concentration sensor. An unbalanced Mach-Zehnder is used as the sensor device to demonstrate concentrations of Potassium Chloride in deionized water. A sensitivity of 700 nm/RIU and a limit of detection (LOD) of 7.142e^-6 RIU are achieved experimentally. To the best of our knowledge, the demonstrated sensitivity is the highest for an on-chip guided waveguide sensing scheme.
Cite
@article{arxiv.2302.04474,
title = {On-Chip Chemical Sensing Using Double-slot Silicon Waveguide},
author = {Sushma Gali and Akshay Keloth and Shankar Kumar Selvaraja},
journal= {arXiv preprint arXiv:2302.04474},
year = {2023}
}
Comments
6 pages,10 figures