研究目的
To study the walk-off of the beam from the interrogation spot during rotation in surface plasmon resonance experiments using prism-based coupling and to find an optimal and simple configuration to minimize this effect.
研究成果
The study demonstrates that the walk-off of the spot on the sensing surface in prism-based SPR systems can be significantly minimized by optimizing the position of the rotation axis. The proposed configuration is simple to implement and can be applied to other techniques using prism-coupling with varying angles of incidence.
研究不足
The walk-off effect is inherent to prism-based SPR systems and cannot be completely eliminated, only minimized. The study focuses on a specific type of prism and may not be directly applicable to all prism geometries.
1：Experimental Design and Method Selection:
The study involves a theoretical analysis of the walk-off behavior during rotation around an arbitrary fixed axis and proposes an optimal configuration to minimize this effect. The proposed setup is experimentally tested.
2：Sample Selection and Data Sources:
The experiment uses a prism-based SPR setup with a gold sensing thin film.
3：List of Experimental Equipment and Materials:
A motorized rotatory stage mounted on a XY translation stage, a diode laser, a focusing lens, and a CCD camera are used.
4：Experimental Procedures and Operational Workflow:
The prism is fixed on the laboratory frame of reference, and the scattered light from a non-polished face is observed via a CCD camera. The beam is aligned along the rail and can be offset with a translation stage.
5：Data Analysis Methods:
The walk-off is measured as a function of the angle of incidence for different positions of the rotation axis.
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