A system and method for surface tissue ablation on the patient’s outer skin, such as the epidermis or the underlying dermis. The device comprises a low doped n-type region formed by plasma etching through the first epitaxial layer grown on a heavily doped n-type substrate and a plurality of heavily doped p-type regions formed by plasma etching through the second epitaxial layer grown on the first epitaxial layer. Once the probability density distribution functions for the vehicle and the background are calculated, the classification boundary between the vehicle and the background is determined using the probability density distribution functions for the vehicle or the background, or both, and a predefined model that is appropriate. A communication module has a second transceiving module configured to exchange data with the first transceiving module in a wireless manner. By defining a relationship between throughput and response time a distance may be calculated between the curves, and this distance may be used to determine an optimal load.