研究目的
To configure and analyze a nanostructured device that hybridizes grating modes and surface plasmon resonances for high-sensitivity refractometric sensing.
研究成果
The proposed nanostructured device demonstrates high sensitivity and FOM for refractometric sensing, with a wide dynamic range and operation under normal incidence conditions. The use of a high-index dielectric layer and careful material selection optimizes performance, making it suitable for biomedical applications like tear film analysis.
研究不足
The study is based on simulations, and practical implementation may face challenges in fabrication and integration with optical systems. The ultra-narrow spectral response requires high-resolution spectrometers for operation.
1：Experimental Design and Method Selection:
The study involves the design of a nanostructured device combining grating modes and surface plasmon resonances. The model uses an effective index of refraction considering the volume fraction of materials and plasmon propagation depth.
2：Sample Selection and Data Sources:
The device is simulated with materials like Ag, GaP, and Si3N4, with water as the analyte. The refractive index of the analyte is varied from 1.3 to 1.
3：3 to List of Experimental Equipment and Materials:
56.
3. List of Experimental Equipment and Materials: The device consists of a dielectric nano-triangle grating on a metal/dielectric interface, with a high-index dielectric layer separating the metal from the analyte.
4：Experimental Procedures and Operational Workflow:
The device is illuminated under normal incidence conditions with TM polarized light. The spectral reflectance is calculated to identify resonance conditions.
5：Data Analysis Methods:
The sensitivity and figure of merit (FOM) are calculated based on the spectral shift and full-width-at-half-maximum (FWHM) of the reflectance minima.
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