Study On Optical Nonlinear Effect Of Nanometer Au-Film

We have investigated a new phenomenon in this paper. The intensity oftransmission and reflection will change with time when a laser beam input on anAu-film. In the experiment, the thickness of Au-film and glass-substrate are 50-60 nm and 2 mm respectively. Wavelength of the Ar+ laser is 488 nm . Wemeasured intensity of transmission and reflection and find that they have anobvious variation with time.The main works included the transmission intensity were measured whenintensity of incident laser was changed and incident angle was changed. Throughanalysis of experimental results, we find the intensity of transmission andreflection has the relation with the intensity of incident laser. The period oftransmission intensity wave is increase as the intensity of laser descends.Meanwhile, the intensity change of transmission intensity wave becomes weakwith lowering power. On the other hand, the phenomenon of nonlinear wave isdisappear when we decrease the incident angle. There is same result when thelight input on Au-film or glass-substrate. Finally we found that the transmissionintensity of He-Ne laser will increased when the Ar+laser input on the same point.