Optical amplification using surface plasmon resonance with total internal reflection

The surface plasmon enhanced optical amplification is proposed, designed and simulated in Kretschmann geometry formed by a 500 μm thick, 10 mm long and 5 mm wide BK7 parallel slab and 29 nm thin gold layer which is sandwiched between the said parallel slab and 20 nm thin GaAs layer. This GaAs layer is pumped by 1319 nm higher order Gaussian beam of a Nd:YAG laser, which passes through a cylindrical lens thereby generating a high aspect ratio elliptical cross section to attain intensity dependent negative extinction coefficient on that 3 mm long strip of irradiated GaAs. The negative extinction coefficient of GaAs layer facilitates the amplification of the incident optical radiation at 1550 nm within the communication window. Here the incident pulsed optical radiation of 5 mW is amplified to 274 MW through external pumping and surface plasmon resonance phenomenon by total internal reflection with three bounces along the length of said BK7 parallel slab considering the Goos–Hänchen shift at the slab-Au layer interface and slab-air interface.