Implantable silicon neural probes with nanophotonic phased arrays for single-lobe beam steering
arxiv(2024)
摘要
In brain activity mapping experiments using optogenetics, patterned
illumination is crucial for deterministic and localized stimulation of neurons.
However, due to optical scattering in brain tissue, light-emitting implantable
devices are needed to bring precise patterned illumination to deep brain
regions. A promising solution is silicon neural probes with integrated
nanophotonic circuits that form tailored beam emission patterns without lenses.
Here, we demonstrate neural probes with grating-based light emitters that
generate a single steerable light beam across > 60% of the steering range
with ≥ 4 dB of background suppression for optogenetic photostimulation. The
light emitters, optimized for blue or amber light, combine end-fire optical
phased arrays with slab gratings to suppress higher-order sidelobes.
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