Fig. 1: Design and fabrication of the transparent neural probe.

a Device layout with 16 PEDOT:PSS electrodes and 2.5 mm long PEDOT:PSS interconnects. Outside the transparent window gold interconnects were used to minimize resistive losses. b Schematic representation of the fabrication process which included the use of a release layer, opening of the electrode sites, gold and PEDOT:PSS patterning, and encapsulation with Parylene C.