研究目的
Investigating an optical sensor composed of a circular cylindrical fiber surrounded by a graphene layer for detecting small alterations in the index of refraction of an aqueous analyte.
研究成果
The sensitivity of the optical fiber sensor to changes in the cladding refractive index can be significantly improved by adjusting the graphene layer's conductivity, chemical potential, and electron relaxation time. The optimal core radius for maximum sensitivity was identified, beyond which sensitivity decreases due to wave confinement in the core.
研究不足
The study is limited to TE waves and does not consider other polarizations. The effect of temperature on the sensor's performance is briefly mentioned but not deeply analyzed.
1：Experimental Design and Method Selection:
The study involves solving Helmholtz equation in the core and cladding regions of an optical fiber with a graphene layer at the interface. TE waves are considered for propagation.
2：Sample Selection and Data Sources:
The core region is silicon nitride (Si3N4), and the cladding is an aqueous material.
3：List of Experimental Equipment and Materials:
Optical fiber, graphene layer, aqueous cladding material.
4：Experimental Procedures and Operational Workflow:
The dispersion relation is derived using Maxwell’s equations, and the sensitivity of the effective refractive index to changes in the cladding refractive index is calculated.
5：Data Analysis Methods:
The characteristic equation is solved numerically using MAPLE? 17 software for the effective refractive index (N) of the propagating mode.
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