If you elect to produce current density data, then you may use the Sonnet - Results - View Currents command in the layout menu to open Sonnet’s current density viewer. The current density viewer is a visualization tool which acts as a post-processor to em providing you with an immediate qualitative view of the electromagnetic interactions occurring within your circuit.
To create the current density data, select the “Compute Currents” option in the Sonnet Options dialog box. For more information, see Options.