Surface plasmon resonance sensor based at metallic subwavelength structures

Simulated transmission spectrums and the change of the transmission peak position with the refractive index by the finite-difference time-domain method are present. The considered structure is the two-dimensional metallic square hole and trapezoid hole array, and the change of the transmission peak position with the refractive index can achieve about 1000 nm RIU−1. In comparison, the sensor properties of the metallic trapezoid hole array is better than that of the metallic square hole array. Meanwhile, the field intensity enhancement and localization of the metallic trapezoid hole are better. Meanwhile, these array structures can extensively apply to biochemical sensor devices design and localized field enhancement device so on.