研究目的
To enhance the resolution ability of plasmonic sensing elements by implementing metal-insulator-metal (MIM) plasmonic nanostructures and concatenating them with waveguiding substructures to achieve mutual coupling of surface plasmon polariton (SPP) with an optical waveguiding mode.
研究成果
The mutual coupling of SPR modes excited in MIM structure with guided modes in linked waveguiding sub-system allows establishing various coupled resonance states formatting favorable conditions for sensoric applications. The designed structure may achieve equivalent results as a pure SPR arrangement, with improved resolution ability due to field intensity enhancement.
研究不足
The study acknowledges that comparison studies of the SPR and SPP-WG sensors showed less sensitivity in the second case, but the designed structure may achieve equivalent results as a pure SPR arrangement, namely by the better figure of merit.
1：Experimental Design and Method Selection:
The study employed a 4 × 4 matrix method based on rigorous coupled-waves algorithm (RCWA) implemented as its own Matlab code. The experimental arrangement for sensor response analysis was based on lock-in detection technique.
2：Sample Selection and Data Sources:
The study used a bismuth-doped gadolinium iron garnet waveguide layer on a gallium-gadolinium garnet substrate with refractive indices at the wavelength 633 nm.
3：List of Experimental Equipment and Materials:
The materials included Bi:GIG, GGG, rutile prism, gold film, and SiO2 gap.
4：Experimental Procedures and Operational Workflow:
The study involved analyzing the coupling between plasmonic and waveguiding modes through changes in waveguide conditions and geometrical parameters of MIM sub-structure.
5：Data Analysis Methods:
The sensitivity and resolution limit of the sensing device were calculated based on reflectance increment at a reference incidence angle.
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