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Small footprint optoelectrodes using ring resonators for passive light localization

Journal Article · · Microsystems & Nanoengineering (Online)
 [1];  [2];  [3];  [4];  [5];  [4];  [4];  [5];  [5];  [5];  [5];  [5];  [2];  [5]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Politecnico di Torino (Italy)
  2. Univ. of California, Berkeley, CA (United States)
  3. aBeam Technologies, Hayward, CA (United States)
  4. Politecnico di Torino (Italy)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
The combination of electrophysiology and optogenetics enables the exploration of how the brain operates down to a single neuron and its network activity. Neural probes are in vivo invasive devices that integrate sensors and stimulation sites to record and manipulate neuronal activity with high spatiotemporal resolution. State-of-the-art probes are limited by tradeoffs involving their lateral dimension, number of sensors, and ability to access independent stimulation sites. Here, we realize a highly scalable probe that features three-dimensional integration of small-footprint arrays of sensors and nanophotonic circuits to scale the density of sensors per cross-section by one order of magnitude with respect to state-of-the-art devices. For the first time, we overcome the spatial limit of the nanophotonic circuit by coupling only one waveguide to numerous optical ring resonators as passive nanophotonic switches. With this strategy, we achieve accurate on-demand light localization while avoiding spatially demanding bundles of waveguides and demonstrate the feasibility with a proof-of-concept device and its scalability towards high-resolution and low-damage neural optoelectrodes.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1827980
Journal Information:
Microsystems & Nanoengineering (Online), Journal Name: Microsystems & Nanoengineering (Online) Journal Issue: 1 Vol. 7; ISSN 2055-7434
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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