Detection of transient reflection gratings under surface plasmon resonancecondition: Numerical simulation

Based on rigorous electromagnetic wave theory, a theoretical analysis is pr esented to study the laser beam reflected and diffracted from the metallic grating, which is excited in the surface plane by interference of two pulse d laser beams. Numerical results show that at some distinct incidence angle s surface plasmon resonance occurs and the intensity change of reflected li ght is about 50 times larger than that of diffracted laser beam under norma l incidence. This suggests a sensitive method for detecting transient refle cting gratings, especially in real time measurements.