Analysis of a Surface Plasmon Resonance Waveguide Sensor Using the BPM with the Complex Padé Approximant

Numerical Investigation of a Kretschmann-Type Surface Plasmon Resonance Waveguide Sensor

“…In Fig. 4, the result of the Fresnel approach is also included, in which the waveguide region (x < 0) is assumed to be a homogeneous medium [7]. The maximum absorption wavelength is calculated to be 0.6038 µm, which is in reasonable agreement with the wavelengths obtained from the BPM and the FDTDs.…”

“…This results in a noticeable reduction in the output power. In [7], we have calculated n SPP against n a through the eigenmode analysis using the imaginary-distance BPM [18] to find the resonance condition. As a result, we have chosen the incidence angle to be θ = 78…”

“…To circumvent these difficulties, we have briefly reported a sensor structure, in which input/output parts in the Kretschmann configuration are replaced with optical waveguides [7]. The characteristics of the Kretschmann-type waveguide-based SPR sensor have been analyzed in the frequency domain using the wide-angle beam-propagation method (BPM) [8], [9] with the complex Padé approximant [10]- [12].…”