研究目的
Investigating the enhancement of the evanescent field ratio in a modified ridge waveguide structure for methane gas sensing application.
研究成果
The proposed modified ridge waveguide structure significantly enhances the evanescent field ratio for methane gas sensing, achieving a sensitivity of 0.0715 (mW/gas conc.) with a propagation loss of ~0.7 dB/μm. This design combines the benefits of high evanescent field interaction and low propagation loss, making it suitable for highly sensitive gas sensors.
研究不足
The study focuses on methane gas sensing at a specific wavelength (3.392 μm). The proposed waveguide scheme may require precise fabrication techniques.
1：Experimental Design and Method Selection:
The study involves the modification of a ridge waveguide into a dual hybrid plasmonic waveguide by tapering the middle section and adding a gold layer on both sides with a sub-wavelength gap. The finite element method (FEM) is used for simulation.
2：Sample Selection and Data Sources:
The waveguide geometry is optimized for methane gas absorption at
3：392 μm. List of Experimental Equipment and Materials:
Silicon ridge waveguide, gold layer, and a sub-wavelength gap are used.
4：Experimental Procedures and Operational Workflow:
The waveguide's evanescent field ratio, propagation loss, confinement factor, and electric field distribution are analyzed.
5：Data Analysis Methods:
The sensitivity of the waveguide is calculated based on the decay in transmission power due to gas absorption.
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