A method for determining a control parameter of a power or torque distribution regulator for a hybrid drive of a work machine having the steps of automatically determining a work cycle that has just been performed by the work machine, and selecting of the control parameter as a function of the work cycle determined in the previous step. In one embodiment, an SPM probe tip is configured to support an appropriate receiving element so as to provide a nano-localized light source that is able to efficiently and locally excite the sample on the nanoscale. Device modifications enable inclusion of sodium dodecyl sulfate in the second dimension. An LED is disposed in contact with a lower surface of the light entrance region.