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(A) Optical image of the “J-shaped” SU-8 microprobe featuring bipolar gold electrodes recessed in “grooves” designed to guide fiber growth, “wings” to maintain central position within implant channels, serpentine feature for greater flexion, and wire bonding pads. (B) SEM image of bipolar gold electrodes in recessed grooves. (C) Close-up image of bipolar groove electrode tip. © 2008 IEEE. Reprinted from Cho et al. [29] with permission.
