A Mechanically Flexible, Implantable Neural Interface for Computational Imaging and Optogenetic Stimulation Over 5.4×5.4mm 2 FoV.
- Resource Type
- Academic Journal
- Authors
- Moazeni S; Pollmann E; Boominathan V; Cardoso FA; Robinson J; Veeraraghavan A; Shepard K
- Source
- Publisher: IEEE Country of Publication: United States NLM ID: 101312520 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1940-9990 (Electronic) Linking ISSN: 19324545 NLM ISO Abbreviation: IEEE Trans Biomed Circuits Syst Subsets: MEDLINE
- Subject
- Language
- English
Emerging optical functional imaging and optogenetics are among the most promising approaches in neuroscience to study neuronal circuits. Combining both methods into a single implantable device enables all-optical neural interrogation with immediate applications in freely-behaving animal studies. In this paper, we demonstrate such a device capable of optical neural recording and stimulation over large cortical areas. This implantable surface device exploits lens-less computational imaging and a novel packaging scheme to achieve an ultra-thin (250μm-thick), mechanically flexible form factor. The core of this device is a custom-designed CMOS integrated circuit containing a 160×160 array of time-gated single-photon avalanche photodiodes (SPAD) for low-light intensity imaging and an interspersed array of dual-color (blue and green) flip-chip bonded micro-LED (μLED) as light sources. We achieved 60μm lateral imaging resolution and 0.2mm 3 volumetric precision for optogenetics over a 5.4×5.4mm 2 field of view (FoV). The device achieves a 125-fps frame-rate and consumes 40 mW of total power.