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SURFACE PLASMON-RESONANCE SENSOR FOR EXPRESS ANALYSES

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Surface plasmon resonance sensors are considered in Kretzmann configuration with different types of wave beams: parallel, diverging, and converging. Statistical measurements of the angle of total internal reflection of prism carried out in parallel wave beam with stepwise variation of the incidence angle, demonstrate high measurement accuracy of the method. Conversion from a discrete method to the measures of the entire diverging beam aperture allows to cover large range of angles, including the angles of total internal reflection and surface plasmon resonance, with a single measure. Therefore, the productivity of measurement process significantly increases without loss of accuracy. Changing the shape of the resonance curve in the transition from discrete to the aperture method is correlated with changes in the conditions of surface plasmons excitation. The large width of the resonance curve leads to a decrease in sensitivity of the method, and at the same time reduces significantly the time of measurements.

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