Controlled fabrication of micro channels

The etching of ion track channels is controlled in real-time by electric current measurements down to the sub nA range. The current through the channel is observed using a LabVIEW based program communicating with the electrolytic cell through a data acquisition card. To minimize electrode charging a sinusoidal voltage of low amplitude is used. The resulting current is amplified and detected phase sensitively. Click on thumbnails for details.