研究目的
Investigating the construction and performance of high sensitivity biosensors based on the coupling of surface plasmon polaritons on titanium nitride (TiN) and a planar waveguide mode for sensing materials with a refractive index between 1.0 and 1.6, particularly materials of biological interest.
研究成果
The study successfully demonstrated the construction of high sensitivity biosensors based on the coupling between surface plasmon polaritons on titanium nitride and a planar waveguide mode. The sensors showed promising results for sensing materials with refractive indices between 1.0 and 1.6, with improved sensitivity parameters for higher refractive index materials. Theoretical calculations suggest further improvements can be made by adjusting the thickness of the H-layer and the refractive index of the L-layer.
研究不足
The study is limited by the specific materials and configurations used, such as the choice of titanium nitride and the multilayer structure design. The sensitivity and performance of the sensors may vary with different materials or configurations. Additionally, the experimental setup may not capture the extremely sharp Fano resonances accurately due to the finite width of the laser spot.
1：Experimental Design and Method Selection:
The study involved the construction of biosensors by depositing Nb2O5/SiO2/TiN multilayer structures on D-shaped sapphire prisms using the dc magnetron sputtering technique. ATR experiments in the Kretschmann configuration were performed to study the plasmonic properties.
2：Sample Selection and Data Sources:
Three different sensing media were used: air, water, and dried egg white, to test the sensors' performance across a range of refractive indices.
3：List of Experimental Equipment and Materials:
A helium-neon laser of 632.8 nm was used as the light source, along with a polarizer, thin slit, and photo detector for measuring reflected beam intensity. The multilayer structures were characterized using X-ray diffraction and scanning electron microscopy.
4：8 nm was used as the light source, along with a polarizer, thin slit, and photo detector for measuring reflected beam intensity. The multilayer structures were characterized using X-ray diffraction and scanning electron microscopy.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The ATR spectra were measured for angles of incidence from 20 to 85 degrees, with data automatically recorded. The experimental setup included a theta-2theta system for precise angle measurements.
5：Data Analysis Methods:
The ATR spectra were fitted using the transfer-matrix method to obtain optical constants and thicknesses of the layers. Angular sensitivity and figure of merit were calculated from the fitted spectra.
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