A Dual-Shank Neural Probe Integrated with Double Waveguides on Each Shank for Optogenetic Applications

초록

This paper presents a dual-shank neural probe integrated with double-waveguides on each shank, which enables both optical stimulation and electrical recording. Two 15-mu m-thick polymeric (SU-8) waveguides on each neural probe shank have been precisely defined by photolithography with a width of 24 mu m and a spacing of 10 mu m. The waveguides transmit a light coupled from optical fibers which are placed in the grooves located at the neural probe body. Each shank has 8 iridium recording electrodes which have the area of 11 mu m x 13 mu m. In front of each waveguide, four recording sites are deployed with a pitch of 100 mu m. Blue light (473 nm in wavelength) has been successfully transmitted to the stimulation sites located at the end of the fabricated neural probe tips.

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