Code Multiplexed Nanocapacitor Arrays for Scalable Neural Recordings

Abstract

Large scale neural recordings are redefining our understanding of the brain. However, simultaneously recording potentials from thousands of microelectrodes remains challenging. We overcome this limitation by measuring activity-induced changes in mutual capacitance. Code division multiplexing enabled simultaneous recordings of neural activity from 1,024 nanocapacitor electrodes at a density of 10k electrodes/mm.2 Features of neural activity i.e., action potentials, bursts, and local field potentials were measured in recordings, benchmarking our device against the state-of-the-art. SummaryCapacitive sensing of neural activity improves the scalability, fabrication, and miniaturization of microelectrode arrays.