Numerical investigation on the multi-channel waveguide-based surface plasmon resonance sensor using the rigorous coupled-wave analysis

We develop a numerical modeling of the multi-channel waveguide-based surface plasmon resonance sensor based on the rigorous coupled-wave analysis. The cascaded structure which consists of elementary surface plasmon resonance sensors with different resonance wavelengths can be used for simultaneous sensing of change in surrounding dielectric constants. The method to anticipate the center wavelength of resonance is adressed and its physical underlying principle is discussed with respect to the mode distribution and phase matching condition. A few simulations are provided for validating our model and analysis.