Implantable silicon neural probes with nanophotonic phased arrays for single-lobe beam steering
| Autor: | Chen, Fu-Der, Sharma, Ankita, Xue, Tianyuan, Jung, Youngho, Govdeli, Alperen, Mak, Jason C. C., Chameh, Homeira Moradi, Movahed, Mandana, Brunk, Michael G. K., Luo, Xianshu, Chua, Hongyao, Lo, Patrick Guo-Qiang, Valiante, Taufik A, Sacher, Wesley D., Poon, Joyce K. S. |
|---|---|
| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 $\ge 4$ 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. Comment: 32 pages, 7 figures |
| Databáze: | arXiv |
| Externí odkaz: |
|