About the nature of the enhancement of the nonlinear optical response from rough surface

It is treated the superfocusing conditions of the surface plasmon polaritons (SPPs) in the system of two touching cones, when one of the cones is of metal and the other is a semiconductor. The regularities of increasing of wave fields SPPs depending on the parameters of system are discovered. The considering phenomena give possibility to propose the experimental way for exploring the anomalous enhancement of the nonlinear optical response from rough surface.