研究目的
Investigating the coupling between surface plasmon polariton (SPP) mode in metal-insulator-metal waveguide and planar waveguide (PWG) mode to enhance the sensitivity of biosensors.
研究成果
The proposed biosensor demonstrates significant sensitivity enhancement through the coupling between SPP and PWG modes, achieving sensitivities up to 9733 and 7050 RIU?1 for PWG mode dip and Fano resonance, respectively. This represents a 2～3 orders of magnitude improvement over conventional SPR sensors, offering potential for high-performance plasmonic biosensors.
研究不足
The study is based on numerical simulations and theoretical modeling, which may not fully capture all practical aspects of sensor fabrication and operation. The sensitivity enhancement is demonstrated under specific conditions that may limit its applicability in diverse sensing environments.
1：Experimental Design and Method Selection:
The study proposes a biosensor based on a metal-insulator-metal/planar waveguide structure, utilizing the Kretschmann configuration of attenuated total reflection (ATR). The methodology involves theoretical modeling and numerical simulations to analyze the coupling between SPP and PWG modes.
2：Sample Selection and Data Sources:
The model includes a prism, a MIM waveguide, and three dielectric layers. The materials used are specified, including Ag for metal layers and Cytop for dielectric layers.
3：List of Experimental Equipment and Materials:
The setup involves a plane wave of TM polarization with a wavelength of 633 nm incident on the prism. Materials include chalcogenide glass (2S2G) as the coupling prism, Ag for metal layers, and Cytop and ZnS-SiO2 for dielectric layers.
4：Experimental Procedures and Operational Workflow:
The study calculates the reflection coefficient and reflectivity using the transfer matrix method. The dispersion relations of SPP and PWG modes are derived and solved numerically.
5：Data Analysis Methods:
The sensitivity of the sensor is calculated based on the change in reflectivity with respect to the refractive index of the sensing medium.
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