Numerical Investigation of a Kretschmann-Type Surface Plasmon Resonance Waveguide Sensor
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A Kretschmann-type surface plasmon resonancewaveguide sensor is analyzed using the wide-angle beampropagationmethod (BPM) with the complex Padé approximantand the finite-difference time-domain (FDTD) methods based onthe recursive convolution (RC) and piecewise linear RC (PLRC)techniques. The wavelength responses of the sensor are calculated,and a detailed comparison of the numerical results is made. TheBPM results are validated through a comparison with the FDTDresults, in which the PLRC technique is required in terms ofaccuracy. The waveguide sensor shows a maximum absorptionwavelength shift from 0.609 to 0.623 μm, as the refractive index ofan analyte is increased from 1.330 to 1.334, which is comparableto the sensitivity of the conventional Kretschmann configuration.
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