Considering the Origin of Surface Plasmon Polaritons for a Surface Plasmon Sensor with 1D Metal Grating Structure and Characterization of Sensitivity

Surface plasmon resonance (SPR) is widely used in applications such as the detection of infinitesimal materials and high-efficiency photoelectric conversion. For a target medium with a high refractive index (n > 1.5), total reflection generally becomes impossible owing to a limitation in the incidence angle of light; therefore, such a medium cannot be detected. For this problem, we focused on a method that uses a diffraction grating as the structure of the sensor.