研究目的
To theoretically design and experimentally validate a bulk refractive index sensor based on a straight long-range surface plasmon polariton (LRSPP) waveguide operating at 850 nm, aiming for portable, low-cost refractometer applications.
研究成果
The study successfully demonstrates a bulk refractive index sensor based on a straight LRSPP waveguide with a sensitivity of 196 dB/RIU/mm. The fabricated waveguides validate the feasibility of the design, indicating potential for portable, low-cost refractometer applications.
研究不足
The study is limited by the non-ideal waveguide end-facet at the input, causing excess coupling loss. The coupling loss could be reduced with improved fabrication techniques such as dicing and polishing processes.
1：Experimental Design and Method Selection:
The study employs the finite difference eigenmode method (FDE) to optimize the geometric parameters of the Au stripe waveguide at 850 nm.
2：Sample Selection and Data Sources:
The waveguide sensor consists of an Au stripe embedded in SU-8 polymer, with the refractive index of the sensing solution ranging from
3：562 to List of Experimental Equipment and Materials:
Key materials include Au stripe, SU-8 polymer, and silicon substrate. Equipment includes a thermal evaporator for Au deposition and an atomic force microscope (AFM) for characterization.
4：Experimental Procedures and Operational Workflow:
Fabrication involves a double-layer lift-off process, followed by optical transmission characterization to validate the design.
5：Data Analysis Methods:
The sensitivity of the sensor is calculated based on propagation loss measurements and mode power distribution analysis.
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