研究目的
Investigating the performance of a plasmonic waveguide refractive index sensor with high sensitivity and quality factor for aqueous medium.
研究成果
The proposed plasmonic waveguide refractive index sensor demonstrates high sensitivity and quality factor for aqueous medium, making it suitable for biosensing applications. The sensor's performance is attributed to the composite plasmonic waveguide structure, which supports a lossy plasmonic mode with most of the energy concentrated at the metal-dielectric interface. The study suggests that the sensor can be used for biomedical studies on protein antibodies-target molecule interactions, DNA analysis, and characterizations of lectins and lipid bilayers.
研究不足
The study is theoretical and does not include experimental validation. The sensor's performance is analyzed numerically, and practical implementation may face challenges such as fabrication precision and material stability.
1：Experimental Design and Method Selection:
The study proposes a sensor based on angular as well as spectral interrogations of surface plasmon resonance. The structure consists of a prism and a composite plasmonic waveguide. Reflectivity analysis is done for both angular and spectral interrogation.
2：Sample Selection and Data Sources:
The structure is optimized for analyte index 1.33. Reflectivity and phase are calculated as functions of incident angle and wavelength.
3：Reflectivity and phase are calculated as functions of incident angle and wavelength.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The structure includes a MgF2 prism, a Teflon film, a high index polycarbonate film, a thin Ag film, a Si layer, and a semi-infinite analyte (aqueous medium).
4：Experimental Procedures and Operational Workflow:
The reflectance and phase are calculated using Fresnel reflectance coefficients for a multilayer thin film structure. The transfer matrix method (TMM) is used to find the eigenvalue equation of the multilayer structure.
5：Data Analysis Methods:
The sensitivity, full width at half maxima (FWHM), and quality factor are calculated from the reflectivity curves.
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